178 ÈÙ¹Âàì ·¤â¹âÅÂÍÕ ÔàÅ¡ç ·Ã͹ԡÊàì àÅФÍÁ¾ÔÇàµÍÃìààË§è ªÒµÔáÅÐ ∂2 uTAu ∂u ∂uT = 2A (¤.7)
ÀÒ¤¼¹Ç¡ §¤ÓÈѾ·ìà·¤¹¤Ô¡Ãкǹ¡ÒÃà¢ÂÕ ¹ write process¡Ãкǹ¡Ò÷ÓãËéÁ¤Õ Òè ¹éÍÂÊØ´ minimization process¡Ãкǹ¡ÒÃ㹡Ò÷ӹÒÂÊÑ Ò³Ãº¡Ç¹ noise prediction process¡Ãкǹ¡ÒÃ㹡Ò÷ÓãËéÊÑ Ò³Ãº¡Ç¹à»¹Ê¢Õ ÒÇ noise whitening process¡Ãкǹ¡ÒÃÍèÒ¹ read process¡ÃÐáÊä¿¿Òà¢Õ¹ write current¡ÅèÁØ ¢Íé ÁÅÙ data packet¡ÒáÅÓÃËÑʾÅÑ Êì PCM (pulse code modulation)¡ÒáÅÓÊÑ Ò³ (¡ÒÃÁÍ´à٠ŵ) modulation¡ÒâÂÒÂÊÑҳú¡Ç¹ noise enhancement¡ÒÃà¢Òé ¨§Ñ ËÇÐ synchronization¡ÒÃà¢éҨѧËÇÐÍÂèÒ§ÊÁºÃÙ ³ì perfect synchronization¡ÒäҴËÁÒÂ, ¤Òè ¤Ò´ËÁÒ expectation¡Òè´Ñ à¡çº¢Íé ÁÙÅ data storage¡Òè´Ñ à¡ºç ¢Íé ÁÙÅ´¨Ô ·Ô ÅÑ digital data storage¡ÒéÒ projection¡ÒêѡµÑÇÍÂèÒ§ sampling¡ÒÃà´¹Ô áººÊÁèØ random walk¡ÒÃä´éÁÒ acquisition¡ÒõÃǨËÒÅӴѺ sequence detection¡ÒõԴµÒÁ tracking 179
180 ȹ٠Âàì ·¤â¹âÅÂÍÕ àÔ Å¡ç ·Ã͹¡Ô Êàì àÅФÍÁ¾ÇÔ àµÍÃìààË§è ªÒµÔ¡Ò÷ӹÒÂÊÑҳú¡Ç¹ noise prediction¡ÒÃá·Ã¡ÊÍ´ interference¡ÒÃá·Ã¡ÊÍ´ÃÐËÇÒè §ÊÑÅѡɳì ISI (intersymbol interference)¡Òúǡ¡ÒÃà»ÃÕºà·Õº¡ÒÃàÅ×Í¡ ACS (addcompareselect)¡Òú¹Ñ ·Ö¡ recording¡Òúѹ·Ö¡áººá¹Çµ§Ñ perpendicular recording¡Òú¹Ñ ·Ö¡áººá¹Ç¹Í¹ longitudinal recording¡Òú¹Ñ ·Ö¡áººäº¹ÒÃÕ binary recording¡Òú¹Ñ ·¡Ö ÃкºáÁàè ËÅç¡ magnetic recording¡ÒûÃÐÁÇżÅẺà¾Íà«ÍÃìäÇàÇÍÃì PSP (persurvivor processing)¡ÒûÃÐÁÇżÅÊÑ Ò³´Ô¨·Ô ÑÅ digital signal processing¡ÒûÃѺ¤èÒ·Ò§àÇÅÒ timing adjustment¡Òû͹¡ÅѺ feedback¡ÒÃ»Í ¹¡ÅѺ¤Òè µÑ´Ê¹Ô ã¨ decisionfeedback¡ÒÃà»ÅÕ ¹Ê¶Ò¹Ð transition¡ÒÃà»ÅÂÕ ¹Ê¶Ò¹ÐàÍ¡à·È isolated transition¡ÒÃá»Å§«Õ Z transform¡ÒÃá»Å§¿àÙ ÃÕÂÃì Fourier transform¡ÒÃá»Å§¿àÙ ÃÂÕ Ã·ì µÕ èÍà¹Í× §·Ò§àÇÅÒ continuoustime Fourier transform¡ÒÃá¾Ãè¡ÃШÒ¢ͧ¢éͼԴ¾ÅÒ´ error propagation¡ÒÃú¡Ç¹ disturbance¡ÒÃźÅÒé §ÊÀÒ¾áÁèàËÅç¡ demagnetization¡ÒÃàÅ×͹µÓá˹觢ͧ¡ÒÃà»ÅÕ¹ʶҹРtransition shift¡ÒÃàÅ×͹µÓá˹觢ͧ¡ÒÃà»ÅÂÕ ¹Ê¶Ò¹ÐáººÊØèÁ random transition shift¡ÒÃ˹èǧàÇÅÒ¡ÒõѴÊԹ㨠decision delay¡ÒÃËÒ͹¾Ø ѹ¸ì dierentiation¡ÓÅѧ powerà¡ÒÊìà«ÂÕ ¹ Gaussian¢¹Ò´ magnitude¢éͼ´Ô ¾ÅÒ´ error¢Íé ¼´Ô ¾ÅÒ´¡Ò÷ӹÒ prediction error¢Íé ¼´Ô ¾ÅÒ´¡ÓÅѧÊͧà©ÅÂÕ MSE (meansquared error)¢éͼ´Ô ¾ÅÒ´¡ÓÅ§Ñ Êͧà©ÅÕ·¹Õ éÍÂÊØ´ MMSE (minimum meansquared error)¢Íé ¼Ô´¾ÅÒ´·Ò§¤ÇÒÁ¶Õ frequency error¢éͼԴ¾ÅÒ´·Ò§à¿Ê phase error
181¢Íé ¼Ô´¾ÅÒ´·Ò§àÇÅÒ timing error¢éͼԴ¾ÅÒ´·Ò§àÇÅÒ·ËÕ Å§àËÅ×ÍÍÂèÙ residual timing error¢éÍÁÅ٠亹ÒÃÕ binary data¢Íé ÁÅÙ ÇÂÔ µØ (á«Áà»Å) discrete data¤ÇèÐ໹ ÁÒ¡Ê´Ø ML (maximumlikelihood)¤ÇÒÁ¨Ø capacity¤ÇÒÁ¨ØªÍè §ÊÑ Ò³ channel capacity¤ÇÒÁ«ºÑ «é͹ complexity¤ÇÒÁ¶¡Õ Òê¡Ñ µÇÑ ÍÂÒè § sampling rate¤ÇÒÁ¶µÕ ´Ñ cuto frequency¤ÇÒÁ¶ÕẺ¹ÍÃìÁÍÅäÅ«ì normalized frequency¤ÇÒÁ¶Õä¹¤ÇµÔ Êì Nyquist frequency¤ÇÒÁ¹Òè ¨Ð໹ probability¤ÇÒÁ¹èÒ¨Ð໹ ¢Í§¢éͼԴ¾ÅÒ´ probability of error¤ÇÒÁ¹Òè ¨Ð໹ ¢Í§¢Íé ¼Ô´¾ÅÒ´ÅӴѺ probability of sequence error¤ÇÒÁá»Ã»Ãǹ variance¤ÇÒÁäÁèà»¹àª§Ô àÊé¹ nonlinearity¤ÇÒÁ˹Òá¹è¹¡ÒúÃÃ¨Ø packing density¤ÇÒÁ˹Òá¹¹è ¢Í§¡Òú¹Ñ ·¡Ö Ẻ¹ÍÃÁì ÍÅäÅ«ì ND (normalized recording density)¤ÇÒÁ˹Òá¹¹è àª§Ô ¾×¹·Õ areal density¤ÇÒÁ˹Òá¹è¹Ê໡µÃÁÑ ¡ÓÅѧ power spectral density¤Í¹âÇŪ٠¹Ñ convolution¤Òè ¡ÓÅ§Ñ Êͧà©ÅÕ mean square¤Òè à©ÅÂÕ mean¤Òè µ´Ñ Ê¹Ô ã¨ decision¤Òè µ´Ñ ÊԹ㨢³Ð˹§Ö Ẻᢧç instantaneous hard decision¤Òº (àÇÅÒ) period¤Òº¡Òê¡Ñ µÇÑ ÍÂèÒ§ sampling period¤ÒºàÇÅҢͧºÔµ bit period¤Òè àÁµÃ¡Ô ÊÒ¢Ò branch metric¤èÒàÁµÃÔ¡àÊ¹é ·Ò§ path metric¤èÒÅѡɳÐ੾ÒÐ eigenvalueà¤Ã×Í §Ê¶Ò¹Ð¨Ó¡Ñ´ FSM (nite state machine)à¤Ã×Í §ËÁÒÂà¢éÒ¨§Ñ ËÇÐ sync mark§Ò¹»ÃÐÂØ¡µì (á;ÅÔपѹ) application
182 ÈÙ¹Âìà·¤â¹âÅÂÍÕ àÔ Å¡ç ·Ã͹ԡÊìààÅФÍÁ¾ÇÔ àµÍÃìààË觪ҵÔà§Í× ¹ä¢º§Ñ ¤Ñº constraintà§Í× ¹ä¢ºÑ§¤ºÑ ẺâÁ¹¡Ô monic constraint¨Ò¹ (¨Ò¹ºÑ¹·Ö¡) disk¨Ò¹ºÑ¹·¡Ö áÁèàËÅ¡ç magnetic disk¨ÔµàµÍÃì jitter¨µÔ àµÍÃì·Ò§àÇÅÒ timing jitter¨´Ø µÍè node¨Ø´ÊÁ´ØÅ equilibrium point¨´Ø àʶÕÂÃÀÒ¾ stable pointªÍè §ÊÑÒ³ channelªèͧÊÑÒ³ÇÂÔ µØ discrete channelªèͧÊÑÒ³ÊÍ× ÊÒà communication channelªÍè §ÊÑ Ò³ÍèÒ¹ read channelªÔ»ªèͧÊÑ Ò³ÍèÒ¹ readchannel chipàª§Ô àÊé¹ linear«Íé ¹àËÅ×ÍÁ overlap«àÙ »ÍÃì¾ÒÃÒáÁ¡à¹µ¡Ô superparamagneticà«¡àµÍÃì sectorá«Áà»Å, µÇÑ ÍÂÒè § sampleä«à¤ÔÅÊÅ»Ô cycle slip´Ô¨·Ô ÅÑ digital´Õà·ÍÃìÁÔá¹¹µì determinantà´«àÔ ºÅ dB (decibel)â´àÁ¹ domainâ´àÁ¹ D D domainâ´àÁ¹ Z Z domainâ´àÁ¹¤ÇÒÁ¶Õ frequency domainâ´àÁ¹àÇÅÒ time domainµÑǤ³Ù ÅÒ¡ÃÒ¹¨ì Lagrange multiplierµÑǪºÕ Í¡ indicatorµÇÑ ´Óà¹Ô¹¡Òä͹âÇÅÙª¹Ñ convolution operatorµÑÇ´Óà¹¹Ô ¡ÒäÒè ¤Ò´ËÁÒ expectation operatorµÑÇ´Óà¹Ô¹¡ÒÃ˹èǧàÇÅÒ delay operatorµÑǹÓ˹éÒ predecessorµÒÃÒ§¤¹é ËÒ lookup table
183·ÒÃàì ¡çµ target·ÒÃàì ¡µç ·Õà ËÁÒзÊÕ ´Ø optimal target·ÒÃìà¡çµáºº GPR generalized partialresponse (GPR) target·ÒÃàì ¡çµáºº PR partialresponse (PR) target·ÓãËàé »¹ ºÃ÷´Ñ °Ò¹ normalizeà·¤¹¤Ô ¡ÒûÃÐÁÒ³¤èÒ㹪Çè § interpolation techniqueà·ÃÐ亵ì TB (terabyte)á·ç» tapä·ÁÁ§Ô ¿§¡ìªÑ¹ timing functionä·ÁÁ§Ô ¿§¡ªì ѹẺ¹ÍÃÁì ÍÅäÅ«ì normalized timing functionä·ÁÁÔ§Ã¤Ô Ñ¿àÇÍÃÕ timing recoveryä·ÁÁ§Ô ÃԤѿàÇÍÃáÕ ºº·ãÕ ªé¡¹Ñ ·ÑÇä» conventional timing recoveryä·ÁÁÔ§ Ã¤Ô ¿Ñ àÇÍÃáÕ ºº¹ÃÔ ¹Ñ deductive timing recoveryä·ÁÁ§Ô ÃÔ¤¿Ñ àÇÍÃÕẺ»ÃÐÁÒ³¤èÒ㹪Çè § interpolated timing recoveryä·ÁÁ§Ô Ã¤Ô Ñ¿àÇÍÃÕáººÍØ»¹Ñ inductive timing recoveryä·ÁÁԧŻ٠timing loopºµÔ bitºµÔ ¢èÒÇÊÒà message bitºÔµà«ÅÅì (¤Òº¢Í§àÇÅÒã¹Ë¹§Ö ºÔµ) bit cellºÔµà»ÅÕ¹ʶҹРtransition bitºÔµÊèǹà¡Ô¹ redundant bitẹ´Çì ´Ô ·ì bandwidthẹ´Çì ´Ô ·ìà¡Ô¹à»¹ ÈÙ¹Âì zeroexcessbandwidthẹ´Çì ´Ô ·ì¢Í§ÅÙ» loop bandwidthẺ¢éÍÁÙÅ data patternẺ¨ÓÅͧ modelẺ¨ÓÅͧ¡Ò÷ӧҹ¢Í§Ç§¨Ãà¿ÊÅçÍ¡ÅÙ»áººàª§Ô àÊé¹ linearized phaselocked loop (PLL) modelẺ¨ÓÅͧªèͧÊÑ Ò³·Õä ÁèµèÍà¹×ͧ·Ò§àÇÅÒẺÊÁÁÙÅ equivalent discretetime channel modelẺ¨ÓÅͧªèͧÊÑ Ò³àÊÁÍ× ¹¨Ã§Ô realistic channel modelẺ¨ÓÅͧªèͧÊÑ Ò³ÍØ´Á¤µÔ ideal channel model亵ì (1 亵ì = 8 ºÔµ) byte亹ÒÃÕ (°Ò¹Êͧ) binary»ÃÐÊ·Ô ¸¼Ô ŢͧÃËÊÑ code eciency»ÃºÑ ¤èÒ (ãËàé »¹»¨¨ºØ ¹Ñ ) update»ÃÔÁҳ˹èǧàÇÅÒã¹Å»Ù loop delay
184 ÈÙ¹Âàì ·¤â¹âÅÂÕÍÔàÅç¡·Ã͹ԡÊìààÅФÍÁ¾ÇÔ àµÍÃìààË§è ªÒµÔ¼ÅµÍºÊ¹Í§ response¼ÅµÍºÊ¹Í§¡ÒÃà»ÅÂÕ ¹Ê¶Ò¹Ð transition response¼ÅµÍºÊ¹Í§¢Í§Ãкº system response¼ÅµÍºÊ¹Í§àª§Ô ¤ÇÒÁ¶Õ frequency response¼ÅµÍºÊ¹Í§ä´ºµÔ dibit response¼ÅµÍºÊ¹Í§·ÒÃìà¡çµ target response¼ÅµÍºÊ¹Í§ºÒ§ÊÇè ¹ PR (partial response)¼ÅµÍºÊ¹Í§ºÒ§Êèǹ¤ÇèÐ໹ÁÒ¡ÊØ´ PRML (partialresponse maximumlikelihood)¼ÅµÍºÊ¹Í§ºÒ§ÊèǹẺ·ÑÇä» GPR (generalized partialresponse)¼ÅµÍºÊ¹Í§ÍÁÔ ¾ÑÅÊì impulse response¼ÅµÍºÊ¹Í§ÍÔÁ¾ÑÅÊì¨Ó¡Ñ´ FIR (nite impulse response)¼ÅµÍºÊ¹Í§ÍÔÁ¾ÑÅÊäì Áè¨Ó¡Ñ´ IIR (innite impulse response)á¼è¹«´Õ Õ CD (compact disc)á¼è¹´ÇÕ ´Õ Õ DVD (digital versatile disc)á¼è¹ºÑ¹·¡Ö áÁèàËÅç¡ magnetic oppy diská¼¹ÀÒ¾ diagramá¼¹ÀÒ¾à·ÃÅÅÔÊ trellis diagram¾Åѧ§Ò¹ energy¾Å§Ñ §Ò¹Ë¹§Ö ˹èÇ unit energy¾ËعÒÁ (â¾ÅÔâ¹àÁÂÕ Å) polynomialà¾Íà«ÍÃìäÇàÇÍÃäì ·ÁÁ§Ô Ã¤Ô Ñ¿àÇÍÃÕ persurvivor timing recoveryà¾Íà«ÍÃìäÇàÇÍÃäì ·ÁÁ§Ô Ã¤Ô Ñ¿àÇÍÃáÕ ºº·Ó§Ò¹«Ó persurvivor iterative timing recoveryâ¾Å pole¿Å¡Ñ «ì ux¿§¡ªì ѹ function¿§ ¡ªì ¹Ñ ¢Ñ¹º¹Ñ ä´ step function¿§ ¡ªì ѹ¤ÇÒÁ˹Òá¹¹è ¤ÇÒÁ¹èÒ¨Ð໹ probability density function¿§ ¡ìªÑ¹¤ÇÒÁ˹Òá¹¹è ¤ÇÒÁ¹Òè ¨Ð໹Ẻà¡ÒÊìà«Õ¹ Gaussian probability density function¿§ ¡ìªÑ¹â¤Ã๤à¡ÍÃàì ´ÅµÒ Kronecker delta function¿§ ¡ìª¹Ñ ä´àäà´ÅµÒ Dirac delta function¿§¡ªì ѹ¶èÒÂâ͹ transfer function¿§¡ªì ѹÍÁÔ ¾ÑÅÊì impulse functionä¿¿Ò ¡ÃÐáʵç d.c. (direct current)ÀÒÇÐ modeÀÒÇСÒÃä´Áé Ò acquisition mode
185ÀÒÇСÒÃä´éÁÒẺÊÁºÃÙ ³ì perfect acquisitionÀÒÇСÒõ´Ô µÒÁ tracking modeÀÒÇСÒý¡ÍºÃÁ training modeàÁµÃ¡Ô (µÑÇÇ´Ñ ) metricàÁ·Ã¡Ô «ì¡ÒÃà»ÅÂÕ ¹Ê¶Ò¹Ð state transition matrixàÁ·ÃÔ¡«ìÊËÊÑÁ¾¹Ñ ¸ì¢Òé Á crosscorrelation matrixàÁ·ÃÔ¡«ì굄 ÊËÊÑÁ¾Ñ¹¸ì autocorrelation matrixàÁ·ÃÔ¡«àì Í¡Åѡɳì identity matrixäÁàè ¢éÒ¨§Ñ ËÇÐ asynchronousäÁèÁÕÊËÊÑÁ¾¹Ñ ¸ì¡¹Ñ uncorrelatedÃËÊÑ á¡äé ¢¢Íé ¼Ô´¾ÅÒ´ ECC (errorcorrection code)ÃËÑʤ͹âÇŪ٠¹Ñ convolutional codeÃËÊÑ ÁÍ´ÙàŪѹ modulation codeÃдѺ¢Õ´àÃÁÔ à»ÅÂÕ ¹ threshold levelÃкº¡Òè´Ñ à¡ºç ¢éÍÁÙÅ data storage systemÃкº¡Òú¹Ñ ·¡Ö áÁèàËÅ¡ç magnetic recording systemÃкº·Õ¶Ù¡à¢éÒÃËÑÊ coded systemÃкº·ÕÁáÕ ¶º¤ÇÒÁ¶¨Õ Ó¡Ñ´ bandlimited systemÃкº·Õä Áäè ´é¶Ù¡à¢éÒÃËÊÑ uncoded systemÃкºÊ×ÍÊÒôԨԷÅÑ digital communication systemÃÐÂÐ stageÃÐÂзҧ¡ÓÅ§Ñ Êͧà©ÅÕ MSD (meansquared distance)ÃÐÂзҧ»ÃÐÊ·Ô ¸Ô¼Å eective distanceÃÐÂзҧ»ÃÐÊ·Ô ¸¼Ô Å¡ÓÅѧÊͧ squared eective distanceÃÐÂÐ·Ò§Â¤Ø Å´Ô Euclidean distanceÃÐÂÐ·Ò§Â¤Ø ÅÔ´¡ÓÅ§Ñ Êͧ squared Euclidean distanceÃÒ¡¡ÓÅ§Ñ Êͧà©ÅÕ RMS (root mean square)ÃÙ»¤Å¹× waveformàèÔÊàµÍÃìẺàÅÍ× ¹ shift registerÅÍ¡ÒÃ·Ô ÁÖ ¸ÃÃÁªÒµÔ natural logarithmÅͧ¼´Ô Åͧ¶Ù¡ trial and errorÅӴѺ sequenceÅӴѺ¢éͼԴ¾ÅÒ´ error sequenceÅӴѺ¢Íé ¼´Ô ¾ÅÒ´ÍÔ¹¾µØ input error sequenceÅÓ´ºÑ ¢éͼԴ¾ÅÒ´ÍÔ¹¾µØ ·¶Õ Ù¡µéͧ valid input error sequence
186 ȹ٠Âìà·¤â¹âÅÂÕÍÔàÅ¡ç ·Ã͹¡Ô ÊìààÅФÍÁ¾ÇÔ àµÍÃàì àË觪ҵÔÅÓ´ºÑ ¢Íé ÁÙÅ data sequenceÅӴѺ¢éÍÁÅÙ ÂÍè ÂàÅ¢¤Õ odd subsequenceÅӴѺ¢Íé ÁÙÅÂÍè ÂàÅ¢¤èÙ even subsequenceǧ¨Ã VCO VCO (voltagecontrolled oscillator)ǧ¨Ã¡Ãͧ lterǧ¨Ã¡Ãͧ¡ÒûÃÐÁÒ³¤Òè 㹪Çè § interpolation lterǧ¨Ã¡Ãͧ¢Íé ¼´Ô ¾ÅÒ´¡Ò÷ӹÒ prediction error lterǧ¨Ã¡Ãͧ·Ó¹Ò predictor lterǧ¨Ã¡Ãͧ㹡Ò÷ÓãËéÊÑ Ò³Ãº¡Ç¹à»¹Ê¢Õ ÒÇ noise whitening lterǧ¨Ã¡ÃͧẺàªÔ§àʹé linear lterǧ¨Ã¡Ãͧ¼èÒ¹µÓ LPF (lowpass lter)ǧ¨Ã¡Ãͧ¼Òè ¹µÓÍØ´Á¤µÔ ideal lowpass lterǧ¨Ã¡ÃͧŻ٠loop lterǧ¨Ãà¢Òé ÃËÑÊ encoderǧ¨Ãà¢Òé ÃËÑÊá¡äé ¢¢éͼ´Ô ¾ÅÒ´ errorcorrection code (ECC) encoderǧ¨Ãà¢éÒÃËÑÊÁÍ´ÙàŪ¹Ñ modulation encoderǧ¨ÃªÑ¡µÑÇÍÂèÒ§ samplerǧ¨ÃµÃǨËÒ detectorǧ¨ÃµÃǨËÒ¢éͼ´Ô ¾ÅÒ´·Ò§àÇÅÒ TED (timing error detector)ǧ¨ÃµÃǨËÒ¢´Õ àÃÔÁà»ÅÕ¹·äÕ ÁèÁËÕ ¹Çè ¤ÇÒÁ¨Ó memoryless threshold detectorǧ¨ÃµÃǨËÒ¢Õ´àÃÔÁà»ÅÕ ¹·Õä ÁÁè ËÕ ¹Çè ¤ÇÒÁ¨ÓẺËÅÒÂÃдºÑ multilevel memoryless threshold de tectorǧ¨ÃµÃǨËÒ¢Õ´àÃÔÁà»ÅÂÕ ¹áººËÅÒÂÃдºÑ multilevel threshold detectorǧ¨ÃµÃǨËÒ¨Ø´Ê§Ù Ê´Ø peak detectorǧ¨ÃµÃǨËÒÅӴѺ sequence detectorǧ¨ÃµÃǨËÒÅӴѺ·Õ¤ÇèÐ໹ÁÒ¡ÊØ´ MLSD (maximumlikelihood sequence detector)ǧ¨ÃµÃǨËÒÅÓ´ºÑ ·ÕàËÁÒзÊÕ Ø´ optimal sequence detectorǧ¨ÃµÃǨËÒÇÕà·Íúì Ô Viterbi detectorǧ¨ÃµÃǨËÒÊÑ Åѡɳì symbol detectorǧ¨ÃµÃǨËÒ·àÕ ËÁÒзÕÊ´Ø opimal detectorǧ¨Ã¶Í´ÃËÊÑ decoderǧ¨Ã¶Í´ÃËÊÑ á¡é䢢éͼ´Ô ¾ÅÒ´ errorcorrection code (ECC) decoderǧ¨Ã¶Í´ÃËÑÊÁÍ´ÙàŪ¹Ñ modulation decoderǧ¨Ã¡Ãͧ·Ó¹ÒÂ˹֧¢¹Ñ ẺàªÔ§àʹé linear onestep predictorǧ¨Ãà»ÅÂÕ ¹ÊÑÒ³á͹ÐÅç͡໹ÊÑ Ò³´Ô¨Ô·ÑÅ ADC (analogtodigital converter)
187ǧ¨Ãà¿ÊÅÍç ¡Å»Ù PLL (phaselocked loop)ǧ¨ÃÀÒ¤ÃѺ receiverǧ¨ÃÀÒ¤Êè§ transmitterǧ¨ÃÁÍ´àÙ ÅàµÍÃì modulatorǧ¨ÃËÒ͹¾Ø ѹ¸ì dierentiatoràÇ¡àµÍÃìÅѡɳÐ੾ÒÐ eigenvectoràÇ¡àµÍÃìÅ¡Ñ É³Ð੾ÒÐẺ¹ÍÃìÁÍÅäÅ«ì normalized eigenvectorÊ൪ѹà¹ÃÕ stationaryʶҹРstateʶҹеèÍä» next stateʶҹÐàÃÁÔ µé¹ start stateʶһµ ¡ÃÃÁªèͧÊÑÒ³ÍèÒ¹ readchannel architectureÊ໡µÃÑÁ¤Òè ȹ٠Âì spectral nullÊÀÒ¾¤ÇÒÁ໹ áÁàè ËÅ¡ç (¡Ò÷ÓãËàé »¹áÁàè ËÅ¡ç ) magnetizationÊÀÒ¾¤ÇÒÁ໹áÁàè ËÅ¡ç ¢Í§Ê×Í ºÑ¹·¡Ö medium magnetizationÊÀҾźÅÒé §áÁàè ËÅç¡ coercivityÊÀÒ¾ãË«é ÖÁ¼èÒ¹ä´é permeabilityÊÁ¡ÒùÍÃÁì ÍÅ normal equationÊÁ¡ÒÃ»ÃºÑ ¤èÒ update equationÊÅºÑ à»ÅÂÕ ¹ (·ÃÒ¹Êâ¾Ê) transposeÊèǹ»ÃСͺ componentÊËÊÁÑ ¾¹Ñ ¸ì correlationÊËÊÁÑ ¾Ñ¹¸¢ì éÒÁ crosscorrelationÊÑÒ³ signalÊÑ Ò³äº¹ÒÃÕ (ÊÑ Ò³ÊͧÃдºÑ ) binary signalÊÑÒ³¾ÅÑ Êìä´ºÔµ dibit pulseÊÑ Ò³¾ÅÑ Êì乤ÇÔµÊÍì ´Ø Á¤µÔ ideal Nyquist pulseÊÑÒ³¾ÅÑ Êìà»ÅÕ ¹Ê¶Ò¹Ð transition pulseÊÑ Ò³¾ÑÅÊìà»ÅÂÕ ¹Ê¶Ò¹ÐàÍ¡à·È isolated transition pulseÊÑҳú¡Ç¹ noiseÊÑҳú¡Ç¹¡ÒÃà»ÅÂÕ ¹Ê¶Ò¹Ð transition noiseÊÑ Ò³Ãº¡Ç¹à¡ÒÊÊì Õ¢ÒÇ white Gaussian noiseÊÑҳú¡Ç¹à¡ÒÊÊì Õ¢ÒÇẺºÇ¡ AWGN (additive white Gaussian noise)ÊÑҳú¡Ç¹¤ÇÒÁÃÍé ¹ thermal noiseÊÑ Ò³Ãº¡Ç¹¨ÔµàµÍâì ͧÊ×ͺ¹Ñ ·Ö¡ media jitter noise
188 ȹ٠Âìà·¤â¹âÅÂÍÕ ÔàÅç¡·Ã͹¡Ô Êàì àÅФÍÁ¾ÔÇàµÍÃìààË§è ªÒµÔÊÑҳú¡Ç¹·Õ¢ ¹Ö Í¡èÙ ºÑ Ẻ¢Íé ÁÙÅ patterndependent noiseÊÑҳú¡Ç¹·ÕÍÂÙè¹Í¡á¶º¤ÇÒÁ¶Õ outofband noiseÊÑ Ò³Ãº¡Ç¹áººÊÕ colored noiseÊÑ Ò³Ãº¡Ç¹Ê¢Õ ÒÇ white noiseÊÑҳú¡Ç¹Ê×ͺ¹Ñ ·Ö¡ media noiseÊÑ Ò³á͹ÐÅÍç ¡·Ò§ä¿¿Ò ·äÕ ´¨é Ò¡ËÇÑ ÍèÒ¹ (ÊÑÒ³ readback) readback signalÊÁÑ »ÃÐÊÔ·¸Ô coecientÊÍ× ºÑ¹·¡Ö (¨Ò¹áÁèàËÅ¡ç ) media (or medium)àʶÕÂÃÀÒ¾ stableàʹé ⤧é û٠µÇÑ àÍÊ ScurveàÊ¹é ·Ò§·Õ处 ÁªÕ ÕÇÔµÍÂèÙ survivor pathàʹé ÊÒ¢Ò branch˹èǧàÇÅÒ delay˹Çè ¤ÇÒÁ¨Ó¢Í§ªÍè §ÊÑ Ò³ channel memory˹èǤÇÒÁ¨ÓàÊé¹·Ò§ path memoryËÅ¡Ñ ¡ÒÃàª§Ô µ§Ñ ©Ò¡ orthogonality principleËÑÇà¢Õ¹ write headËÇÑ ÍèÒ¹ read headà˵ءÒóì eventà˵¡Ø Òóì¢éͼԴ¾ÅÒ´ error eventà˵ءÒó¢ì Íé ¼´Ô ¾ÅÒ´·âÕ ´´à´¹è dominant error eventáËÅè§µ¹é ·Ò§ sourceáËÅè§»ÅÒ·ҧ destinationÍͿ૵·Ò§¤ÇÒÁ¶Õ frequency osetÍͿ૵·Ò§à¿Ê phase osetÍͿ૵·Ò§à¿Ê¢Í§¡Òê¡Ñ µÇÑ ÍÂÒè § sampling phase osetÍͿ૵·Ò§àÇÅÒ timing osetÍѵÃÒ¡ÒâÂÒ gainÍѵÃÒ¡Òê¡Ñ µÑÇÍÂÒè § sampling rate굄 ÃÒ¡ÒêѡµÑÇÍÂèҧẺà¡Ô¹¨Ã§Ô oversampling rateÍѵÃÒ¡ÒÃÅèàÙ ¢éÒ convergence rate굄 ÃÒ¢éͼԴ¾ÅÒ´ºÔµ BER (biterror rate)ÍѵÃÒ¢èÒÇÊÒÃàª§Ô àÊ鹡ӡѺ asymptotic information rateÍѵÃÒ¤ÇÒÁ˹Òá¹è¹ density ratio굄 ÃÒºÔµ bit rate
189ÍѵÃÒÃËÑÊ code rateÍѵÃÒÊ§è ¢Íé ÁÅÙ data rate굄 ÃÒÊèǹ¤èÒ¡ÓÅѧà©ÅÂÕ ¢Í§ÊÑ Ò³·Õµéͧ¡ÒõèͤèÒ¡ÓÅ§Ñ à©ÅÕ¢ͧÊÑҳú¡Ç¹ SNR (signaltonoise ratio)ÍѵÊËÊÁÑ ¾¹Ñ ¸ì autocorrelationÍÅÑ ¡ÍÃÔ·ÁÖ (¢Ñ¹µÍ¹ÇÔ¸)Õ algorithmÍÑÅ¡ÍÃÔ·ÁÖ ÇàÕ ·Íúì Ô Viterbi algorithmÍÔ¹´Ñ¡·¿Õ (»ÃÐàÀ·¢Í§ËÑÇÍèÒ¹) inductiveÍÔ¹¾µØ (ÃѺà¢éÒ, ¹Óà¢éÒ) inputÍÔÁ µÇÑ saturatedÍÕ¤ÇÍäÅ૪ѹẺÊÁºÙóì perfect equalizationÍÕ¤ÇÍäÅà«ÍÃì equalizerÍÕ¤ÇÍäÅà«ÍÃáì ºº PR partialresponse (PR) equalizerÍ¤Õ ÇÍäÅà«ÍÃáì ºº¼ÅµÍºÊ¹Í§àµÁç fullresponse equalizeràÍÒµì¾µØ (Êè§ÍÍ¡, ¹ÓÍÍ¡) outputàÍÒµì¾Øµ¢Í§ªÍè §ÊÑÒ³ channel outputá͹ÐÅçÍ¡ analogÎÒÃì´´ÔÊ¡äì ´Ã¿ì hard disk driveàÎÃÔ µ«ì Hz (hertz)
190 ȹ٠Âàì ·¤â¹âÅÂÍÕ àÔ Å¡ç ·Ã͹ԡÊàì àÅФÍÁ¾ÇÔ àµÍÃàì àË觪ҵÔ
ºÃóҹءÃÁ [1] S. X. Wang and A. M. Taratorin, Magnetic information storage technology. San Diego: Academic Press, 1999. [2] B. Sklar, Digital communications: fundamentals and applications: Prentice Hall, 2ndedition, 2001. [3] A. M. Taratorin, Magnetic recording systems and measurements: Guzik Technical Enterprises, 2004. [4] J. W. M. Bergmans, Digital baseband transmission and recording. Boston/London/ Dordrecht: Kluwer Academic Publishers, 1996. [5] T. Suzuki, Perpendicular magnetic recording: Its basics and potential for the future, IEEE Trans. on Magnetics, vol. MAG20, no. 5, pp. 675 680, September 1984. [6] J. Moon, The role of signal processing in datastorage, IEEE Signal Processing Magazine, pp. 54 72, July 1998. [7] S. B. Wicker, Error control systems for digital communication and storage. New Jersey: Printice Hall International, 1995. [8] B. Vasic and E. M. Kurtas, Coding and signal processing for magnetic recording systems. New York: CRC Press, 2005. 191
[9] K. A. S Immink, Runlengthlimited sequences, in Proc. of the IEEE, vol. 78, no. 11, pp. 1745 1759, November 1990.[10] »Â Ð â¤ÇÔ¹·ì·ÇÇÕ ²Ñ ¹ì, ¡ÒûÃÐÁÇżÅÊÑÒ³ÊÓËÃѺ¡Òè´Ñ à¡çº¢éÍÁÙÅ´Ô¨Ô·ÅÑ àÅèÁ 1: ¾×¹ °Ò¹ ªÍè §ÊÑ Ò³ÍèÒ¹à¢Õ¹, ÈÙ¹Âàì ·¤â¹âÅÂÍÕ ÔàÅç¡·Ã͹ԡÊàì àÅФÍÁ¾ÇÔ àµÍÃàì àË§è ªÒµÔ (๤෤), 2550.[11] T. A. Roscamp, E. D. Boerner, and G. J. Parker, Threedimensional modeling of perpendicular recording with soft underlayer, J. of Applied Physics, vol. 91, no. 10, May 2002.[12] A. V. Oppenheim, A. S. Willsky, and S. H. nawab, Signals and systems. New Jersey: Prentice Hall, 2ndedition, 1997.[13] Available online at http://www.mathworks.com[14] »ÂÐ â¤Ç¹Ô ·ì·ÇÕÇѲ¹,ì ¤ÁèÙ ×Íâ»Ãá¡ÃÁÀÒÉÒ SCILAB ÊÓËÃѺ¼éÙàÃÔÁµé¹ (¾ÔÁ¾ì¤Ãѧ·Õ 2), Èٹ¼ì ÅµÔ µÓÃÒàÃÂÕ ¹, ʶҺ¹Ñ à·¤â¹âÅÂÕ¾ÃШÍÁà¡ÅéÒ¾Ãй¤Ãà˹×Í, 2549.[15] G. D. Forney, Maximumlikelihood sequence estimation of digital sequences in the presence of intersymbol interference, IEEE Trans. on Information Theory, vol. IT18, no. 3, pp. 363 378, May 1972.[16] J. R. Barry, E. A. Lee, and D. G. Messerschmitt, Digital communication. Boston: Kluwer Academic Publishers, 3ndedition, 2003.[17] H. K. Thapar and A. M. Patel, A class of partial response systems for increasing storage density in magnetic recording, IEEE Trans. on Magnetics, vol. 23, no. 5, pp. 3666 3668, September 1987.
[18] P. Kovintavewat, I. Ozgunes, E. Kurtas, J. R. Barry, and S. W. McLaughlin, General ized partial response targets for perpendicular recording with jitter noise, IEEE Trans. on Magnetics, vol. 38, no. 5, pp. 2340 2342, September 2002.[19] J. Moon and W. Zeng, Equalization for maximum likelihood detector, IEEE Trans. on Magnetics, vol. 31, no. 2, pp. 1083 1088, March 1995.[20] S. Raghaven and H. K. Thapar, Feedforward timing recovery for digital magnetic recording, in Proc. of ICC91, vol. 2, pp. 794 798, June 1991.[21] A. N. D Andrea, U. Mengali, and G. M. Vitetta, Approximate ML decoding of coded PSK with no explicit carrier phase reference, IEEE Trans. on Communication, vol. 42, no. 2/3/4, pp. 1033 1039, Feb/Mar/Apr 1994.[22] U. Mengali and A. N. D Andrea, Synchronization techniques for digital receivers, New York: Plenum Press, 1997.[23] J. Moon and L. R. Carley, Performance comparison of detection methods in magnetic recording, IEEE Trans. on Magnetics, vol. 26, pp. 3155 3172, November 1990.[24] K. H. Mueller and M. Mu¨ller, Timing recovery in digital synchronous data receivers, IEEE Trans. on Communication, vol. COM24, no. 5, pp. 516 531, May 1976.[25] M. H. Hayes, Statistical digital signal processing and modeling. John Wiley & Sons Inc., New York, 1996.[26] A. LeonGarcia, Probability and random processes for electrical engineering. New York: AddisonWesley Inc., 2ndedition, 1994.[27] R. D. Cideciyan, F. Dolivo, R. Hermann, W. Hirt, and W. Schott, A PRML system for digital magnetic recording, IEEE J. Selected Areas Commun., vol. 10, no. 1, pp. 38 56, January 1992.
[28] H. Shaee, Timing recovery for sampling detectors in digital magnetic recording, in Proc. of ICC96, vol. 1, pp. 577 581, January 1996.[29] A. R. Nayak, Iterative timing recovery for magnetic recording channels with low signaltonoise ratio, Ph.D. dissertation, Georgia Institute of Technology, Georgia, June 2004.[30] P. Kovintavewat, Timing recovery basedon persurvivor processing, Ph.D. disserta tion, Georgia Institute of Technology, Georgia, October 2004.[31] J. R. Barry, A. Kav˘ci´c, S. W. McLaughlin, and A. R. Nayak, Iterative timing recovery, IEEE Signal Processing Magazine, vol. 21, pp. 89 102, January 2004.[32] X. Jin and A. Kav˘ci´c, Cycleslip detection using softoutput information, in Proc. of ICC01, vol. 9, pp. 2706 2710, June 2001.[33] A. R. Nayak, J. R. Barry, and S. W. McLaughlin, Joint timing recovery and turbo equalization for coded partial response channels, IEEE Trans. on Magnetics, vol. 38, no. 5, pp. 2295 2297, September 2003.[34] F. M. Gardner, Interpolation in digital modems Part I: Fundamentals, IEEE Trans. on Communication, vol. 41, no. 3, pp. 501 507, March 1993.[35] L. Erup, F. M. Gardner, and R. A. Harris, Interpolation in digital modems Part II: Implementation and performance, IEEE Trans. on Communication, vol. 41, no. 6, pp. 998 1008, June 1993.[36] Z. Wu, J. M. Cio, and K. D. Fisher A MMSE interpolated timing recovery scheme for the magnetic recording channel, in Proc. of ICC97, vol. 3, pp. 1625 1629, 1997.
[37] M. Spurbeck and R. T. Behrens, Interpolated timing recovery for hard disk drive read channels, in Proc. of ICC97, vol. 3, pp. 1618 1624, 1997.[38] P. Kovintavewat, J. R. Barry, F. M. Erden, and E. M. Kurtas, Persurvivor timing recovery for uncoded partial response channels, in Proc. of ICC04, Paris, France, vol. 5, pp. 2715 2719, June 20 24, 2004.[39] P. Kovintavewat, J. R. Barry, F. M. Erden, and E. M. Kurtas, Persurvivor iterative timing recovery for coded partial response channels, in Proc. of Globecom04, Texas, USA, vol. 4, pp. 2604 2608, Nov 29 Dec 3, 2004.[40] P. Kovintavewat, J. R. Barry, M. F. Erden, and E. M. Kurtas, Robustness of Per Survivor Iterative Timing Recovery in Perpendicular Recording Channels, IEEE In ternational Conference on Magnetics (INTERMAG 2005), Nagoya, Japan, pp. 1613 1614, April 4 8, 2005.[41] D. G. Messerschmitt, Design of nite impulse response for the Viterbi algorithm and decisionfeedback equalizer, in Proc. of ICC74, pp. 37D15, June 1974.[42] J. Fitzpatrick, J. K. Wolf, and L. Barbosa, New equalizer targets for sampled magnetic recording system, in Proc. of the 25th Asilomar Conference on Signals Systems and Computers, pp. 30 34, November 1991.[43] T. Oenning and J. Moon, Partial response maximum likelihood detection for perpen dicular recording, IEEE International Conference on Magnetics (INTERMAG 2000), p. HT08, 2000.[44] I. Lee, C. Modlin, and J. M. Cio, Equalized maximum likelihood receiver in a magnetic recording channel, in Proc. of ICC93, pp. 1970 1973, November 1993.
[45] C. T. Beare, The choice of the desired impulse response in combined linearViterbi algorithm equalizers, IEEE Trans. on Communication, vol. COM26, no. 8, pp. 1301 1307, August 1978.[46] I. Lee and J. M. Cio, Equalized maximum likelihood receiver with a unit energy constraint, IEEE Trans. on Magnetics, vol. 33, no. 1, pp. 855 862, January 1997.[47] A. Ghrayeb and W. E. Ryan, Precoder design for concatenating convolutional codes with generalized partial response channels, in Proc. of Globecom00, San Francisco, CA, 2000, pp. 1859 1864.[48] L. C. Barbosa, Maximum likelihood sequence estimators: a geometric view, IEEE Trans. on Information Theory, vol. 35, no. 2, pp. 419 427, March 1989.[49] J. Caroselli and J. K. Wolf, Error event characterization of partial response systems in magnetic recording systems with medium noise, in Proc. of Globecom98, vol. 5, pp. 2724 2728.[50] B. E. Moision, P. H. Siegel, and E. Soljanin, Distanceenhancing for digital recording, IEEE Trans. on Magnetics, vol. 34, no. 1, pp. 68 74, January 1998.[51] P. R. Chevillat, E. Eleftheriou, and D. Maiwald, Noisepredictive partialresponse equalizers and applications, in Proc. of ICC92, vol. 2, pp. 942 947, June 1992.[52] E. Eleftheriou and W. Hirt, Noisepredictive maximumlikelihood (NPML) detection for the magnetic recording channel, in Proc. of ICC96, vol. 1, pp. 556 560, June 1996.[53] S. Altekar, Detection and coding techniques for magnetic recording channels, Ph.D. dissertation, Univ. Calif. San Diego, June 1997.
[54] J. Moon and J. Park, Patterndependent noise prediction in signaldependent noise, IEEE J. Selected Areas Comm., vol. 19, no. 4, pp. 730 743, June 2001.[55] J. Caroselli, S. A. Altekar, P. McEwen, and J. K. Wolf, Improved detection for magnetic recording systems with media noise, IEEE Trans. on Magnetics, vol. 33, no. 5, pp. 2779 2781, 1997.[56] X. Yang and E. Kurtas, Noise predictive equalization and detection, Internal report, Channels Department, Seagate Technology, Pittsburgh, PA, May 2003.[57] R. Raheli, A. Polydoros, and C. K. Tzou, Persurvivor processing: a general approach to MLSE in uncertain environments, IEEE Trans. on Commun., vol. 43, no. 2, pp. 354 364, Feb./Mar./Apr. 1995.[58] C. E. Shannon, A mathematical theory of communication, The Bell system technical journal, vol. 27, pp. 379 423, 623 656, July, October, 1948.[59] P. H. Siegel and J. K. Wolf, Modulation and coding for information storage, IEEE Communications Magazine, pp. 68 86, December 1991.[60] K. A. S. AbdelGhaar and J. H. Weber, Constrained block codes for classIV partial response channels with maximumlikelihood sequence estimation, IEEE Trans. on Information Theory, vol. 42, no. 5, pp. 1405 1424, September 1996.
´Ãê¹ÕPW50, 6 ËÅÑ¡¡ÒÃàªÔ§µÑ§©Ò¡, 142 ÍÑÅ¡ÍÃÔ·ÖÁ, 140144 ¡Òú¹Ñ ·¡Ö Ẻá¹ÇµÑ§, 6 à¾Íà«ÍÃäì ÇàÇÍÃì (PSP), 144 ¡Òúѹ·Ö¡áººá¹Ç¹Í¹, 6 àÁµÃ¡Ô ÊÒ¢Ò, 140, 141 PLL, 18, 21, 67GPRML, 133 ¡ÒÃÍ͡Ẻ¤èÒ¾ÒÃÒÁÔàµÍÃ,ì 2330 Íѹ´ºÑ ·ÕÊͧNPML, 115135, 138 ¡Ò÷ÓãËÊé Ñ Ò³Ãº¡Ç¹à»¹ ÊÕ¢ÒÇ, 117 ¡ÒÃÇàÔ ¤ÃÒÐËìàªÔ§àʹé , 2830 ¢Íé ¼Ô´¾ÅÒ´¡ÓÅ§Ñ Êͧà©ÅÂÕ , 119 ÊÁ¡ÒûÃѺ¤èÒ, 22 ·Õ¹éÍÂÊØ´, 120 Íѹ´Ñº·ËÕ ¹Ö§ ¤ÇÒÁ«Ñº«é͹, 126 ¡ÒÃÇÔà¤ÃÒÐËìàªÔ§àÊé¹, 2328 ·ÒÃàì ¡çµ»ÃÐÊ·Ô ¸¼Ô Å, 122, 123 ÊÁ¡ÒÃ»ÃºÑ ¤Òè , 22 »ÃÐÊ·Ô ¸ÔÀÒ¾, 129 àʶÂÕ ÃÀÒ¾, 24, 28 ǧ¨Ã¡Ãͧ·Ó¹ÒÂ, 117, 118 preamble, 22, 34 ËÅÑ¡¡Ò÷ӧҹ, 120129 PRML, 44, 6588, 115, 126, 137 ËÅ¡Ñ ¡ÒÃàª§Ô µÑ§©Ò¡, 119 àÁµÃ¡Ô ÊÒ¢Ò, 121, 122 ÃËÊÑ (0, G/I), 166PDNP, 137150 ǧ¨ÃµÃǨËÒÇàÕ ·ÍÃìºÔ, 69 ¡Ò÷ÓãËÊé Ñ Ò³Ãº¡Ç¹à»¹ Ê¢Õ ÒÇ, 141 ÍÅÑ ¡ÍÃÔ·ÁÖ ÇàÕ ·ÍÃìºÔ, 75 ¤ÇÒÁ«Ñº«Íé ¹, 146 ÍÕ¤ÇÍäÅà«ÍÃ,ì 66 »ÃÐÊÔ·¸ÔÀÒ¾, 146 à¤ÃÍ× §Ê¶Ò¹Ð¨Ó¡Ñ´, 71 ǧ¨Ã¡Ãͧ·Ó¹ÒÂ, 141 á¼¹ÀÒ¾à·ÃÅÅÔÊ, 72 199
SCILAB, 8, 54 ÊÑÒ³¾ÅÑ Êàì »ÅÂÕ ¹Ê¶Ò¹Ð, 6SNR, 21, 104, 130 à˵¡Ø Òóì¢Íé ¼´Ô ¾ÅÒ´, 96Electronics, 55 ¡Òú¹Ñ ·Ö¡áººäº¹ÒÃÕ, 5¢Í§à˵¡Ø Òó¢ì Íé ¼´Ô ¾ÅÒ´, 100 ¤ÇÒÁäÁàè »¹ àª§Ô àʹé , 5 ¡ÒûÃѺ¤èÒ·Ò§àÇÅÒ, 37µèͺµÔ (Eb/N0), 31»ÃÐÊÔ·¸Ô¼Å, 47, 101, 103 ¡ÒÃÍ͡Ẻ·ÒÃàì ¡µç , 4754¡®¢Í§¿ÒÃÒà´Âì, 5 Ẻ h1 = 1, 52 Ẻ·ÒÃìࡵç ੾ÒÐ, 53¡Ãкǹ¡Òà Ẻ¾Å§Ñ §Ò¹Ë¹§Ö ˹èÇÂ, 53¡Ò÷ÓãËéÊÑҳú¡Ç¹à»¹ÊÕ¢ÒÇ, 116, 138, ẺâÁ¹Ô¡ (h0 = 1), 49141 ¡ÒÃà¢Òé ¨§Ñ ËÇÐ, 18, 22, 34, 67ÍÒè ¹, 58 ẺÊÁºÃÙ ³,ì 55, 104, 130, 147à¢Õ¹, 5 ¡ÒÃà´Ô¹áººÊØÁè , 20¡ÃÐáÊä¿¿Ò à¢Õ¹, 4, 5, 152 ¡ÒÃà»ÅÂÕ ¹Ê¶Ò¹Ð, 4, 11, 33, 76, 139, 152¡ÒáÅÓ ÃËÊÑ ¾ÅÑ Êì (PCM), 2 ·´Õ ·Õ ÊÕ Ø´, 77¡Òê¡Ñ µÇÑ ÍÂÒè §, 11, 18, 21, 36 ¼ÅµÍºÊ¹Í§, 6, 45¡Òúǡ¡ÒÃà»ÃÕºà·Õº¡ÒÃàÅ×Í¡, 122 ÊÀÒ¾¤ÇÒÁ໹ áÁèàËÅç¡, 5¡Òúѹ·¡Ö ÃкºáÁèàËÅç¡, 1 àÁ·ÃÔ¡«,ì 158Ẻ¨ÓÅͧªèͧÊÑÒ³, 9 àÍ¡à·È, 6, 55, 104, 130¡Òúѹ·¡Ö Ẻá¹Çµ§Ñ , 3, 44, 54, 96, 103, 147 ¡ÒÃàÅ×Í ¹µÓá˹觢ͧ¡ÒÃà»ÅÕ¹ʶҹÐẺÊèØÁ,·ÒÃàì ¡çµáºº PR, 13, 44 55, 139¼ÅµÍºÊ¹Í§àªÔ§¤ÇÒÁ¶Õ, 8 ¡ÒÃá·Ã¡ÊÍ´ÃÐËÇèÒ§ÊÑ Åѡɳì (ISI), 6, 65,ÊÑÒ³¾ÑÅÊàì »ÅÂÕ ¹Ê¶Ò¹Ð, 6 69, 152à˵¡Ø Òóì¢éͼ´Ô ¾ÅÒ´, 97 ¡ÒÃá»Å§ Z , 24, 28¡Òúѹ·Ö¡áººá¹Ç¹Í¹, 3, 96, 129, 147 ¡ÒÃá»Å§¿àÙ ÃÂÕ Ãì·µÕ Íè à¹×Í §·Ò§àÇÅÒ, 8·ÒÃàì ¡µç Ẻ PR, 12, 44¼ÅµÍºÊ¹Í§àª§Ô ¤ÇÒÁ¶,Õ 8 ¢´Õ ¨Ó¡´Ñ «Ùà»ÍÃì¾ÒÃÒáÁ¡à¹µ¡Ô , 3
¢éͼ´Ô ¾ÅÒ´ ¡Òúѹ·¡Ö Ẻá¹Ç¹Í¹, 44¡ÓÅѧÊͧà©ÅÕ (MSE), 47, 119 ºÔµà«ÅÅì, 6, 24, 55, 103, 147¡ÓÅ§Ñ Êͧà©ÅÂÕ ·¹Õ éÍÂÊØ´ (MMSE), 47, 120¡ÒÃÍ͡Ẻ·ÒÃìà¡çµ, 4754 ¼ÅµÍºÊ¹Í§, 116·Ò§àÇÅÒ, 21, 24, 30, 38 ¡ÒÃà»ÅÂÕ ¹Ê¶Ò¹Ð, 6, 45 ẺÃÒ¡¡ÓÅѧÊͧà©ÅÂÕ (RMS), 34 ¢Ñ¹ºÑ¹ä´, 25 ¢éͼԴ¾ÅÒ´, 26¤ÇèÐ໹ÁÒ¡Ê´Ø (ML), 44 ·ÒÃàì ¡çµ, 12, 45, 68, 138¤ÇÒÁ¶ÕẺ¹ÍÃìÁÍÅäÅ«ì, 8 ºÒ§ÊÇè ¹ (PR), 12, 43, 68¤ÇÒÁ¶Õä ¹¤ÇÔµÊì, 44 ÍÔÁ¾ÅÑ Êì, 20, 30, 148¤ÇÒÁ˹Òá¹è¹ ÍÔÁ¾ÑÅÊì¨Ó¡Ñ´ (FIR), 67, 117, 138 ÍÁÔ ¾ÅÑ ÊìäÁ¨è Ó¡´Ñ (IIR), 117 ¡ÒúÃèØ, 155 àªÔ§¤ÇÒÁ¶Õ, 8, 43 ¢Í§¡Òúѹ·Ö¡¢Íé ÁÙÅ, 6 àµÁç , 67 ¢Í§¡Òú¹Ñ ·Ö¡áºº¹ÍÃÁì ÍÅäÅ«ì (ND), 6 ä´ºµÔ , 8, 45 Ê໡µÃÑÁ¡ÓÅ§Ñ , 20, 55, 103, 130, 147ªÍè §ÊÑ Ò³ÍèÒ¹, 4 ¿§ ¡ìªÑ¹ ¢¹Ñ º¹Ñ ä´, 23·ÒÃìࡵç , 53 ¢éͼ´Ô ¾ÅÒ´, 6 ·Õà ËÁÒзÊÕ Ø´, 47 ¤ÇÒÁ˹Òá¹è¹¤ÇÒÁ¹Òè ¨Ð໹Ẻà¡ÒÊàì «ÂÕ ¹, »ÃÐÊÔ·¸¼Ô Å, 122 55, 78, 103, 139, 147 Ẻ GPR, 13, 45 «§Ô ¡,ì 20 ¶èÒÂâ͹, 13, 24, 46, 117, 138 Ẻ h1 = 1, 52 àÅ¢ªÕ¡ÓÅ§Ñ , 8 â¤Ã๤à¡ÍÃàì ´ÅµÒ, 81 Ẻ·ÒÃìࡵç ੾ÒÐ, 53 Ẻ¾Å§Ñ §Ò¹Ë¹Ö§Ë¹èÇÂ, 53 ÀÒÇÐ, 22 ẺâÁ¹¡Ô , 49, 104, 133, 148 ¡Òõ´Ô µÒÁ, 22 Ẻ PR, 12 ¡Òú¹Ñ ·Ö¡áººá¹Çµ§Ñ , 44
¡ÒÃä´Áé Ò, 22 Ãкº¡ÒÃ¨Ñ´à¡ºç ¢éÍÁÅÙ ´Ô¨·Ô ÅÑ , 3 ¡ÒÃä´éÁÒẺÊÁºÙóì, 34 Ẻ¨ÓÅͧ, 4ÃËÑÊ (0, G/I), 166167 ÃкºÊÍ× ÊÒôԨԷÑÅ, 17 ÃٻẺ NRZI, 4, 151ÃËÊÑ RLL, 3, 91, 151167 ISI, 152 ÅӴѺ¢éͼԴ¾ÅÒ´, 93 ¡ÒÃÍ͡Ẻ, 162164 Í¹Ô ¾µØ ·Õ¶ ¡Ù µÍé §, 94 ¤ÇÒÁ˹Òá¹è¹¡ÒúÃè,Ø 155 ¤ÇÒÁ¨,Ø 154155 ǧ¨Ã VCO, 18 µÒÃÒ§¤é¹ËÒ, 152, 164 ǧ¨Ã¡Ãͧ ºÔµÊèÇ¹à¡¹Ô , 153 ¾ÒÃÒÁàÔ µÍÃ,ì 151 ¢Íé ¼´Ô ¾ÅÒ´¡Ò÷ӹÒÂ, 118 ·Ó¹ÒÂ, 117 ÃËÑÊ (0, G/I), 166 ·Ó¹ÒÂ˹֧¢Ñ¹áººàªÔ§àÊé¹, 118 ¼èÒ¹µÓ, 4 ÃËÑÊ FM, 164 ÃËÊÑ MFM, 164 ¤ÇÒÁ¶ÕµÑ´, 20 ÃËÑÊ Miller, 164 Ż٠, 18 ÍѵÃÒ¢Òè ÇÊÒÃàªÔ§àÊ鹡ӡѺ, 155, 160 ǧ¨Ãª¡Ñ µÑÇÍÂèÒ§, 4, 18 ÍѵÃÒ¤ÇÒÁ˹Òá¹¹è , 155156 ǧ¨ÃµÃǨËÒ, 4 ÍѵÃÒÃËÊÑ , 152 ¢Õ´àÃÔÁà»ÅÕ¹ à¤ÃÍ× §Ê¶Ò¹Ð¨Ó¡Ñ´, 156158 à§Í× ¹ä¢ºÑ§¤Ñº ·ÕäÁÁè ËÕ ¹Çè ¤ÇÒÁ¨Ó, 31 ·ÕäÁÁè Õ˹èǤÇÒÁ¨ÓẺËÅÒÂÃдѺ, 34 ¨Ó¹Ç¹ÅÓ´ºÑ ¢éÍÁÙÅ, 153154 ẺËÅÒÂÃдºÑ , 21 àÁ·ÃÔ¡«ì¡ÒÃà»ÅÂÕ ¹Ê¶Ò¹Ð, 158159 ẺÍÍè ¹, 38 ä·ÁÁ§Ô Ã¤Ô Ñ¿àÇÍÐÃ,Õ 152 Ẻᢧç , 38ÃËÊÑ RS, 3 ¢éͼ´Ô ¾ÅÒ´·Ò§àÇÅÒ, 18ÃËÑʤ͹âÇŪ٠ѹ, 69 ·ÕàËÁÒзÊÕ ´Ø , 69ÃËÑÊÁÍ´ÙàŪ¹Ñ , 151 ÅӴѺ·¤Õ ÇèÐ໹ÁÒ¡Ê´Ø (MLSD), 77 ÅӴѺàËÁÒзÊÕ Ø´, 137
ÇàÕ ·ÍÃìºÔ, 12, 21, 69, 115 ¡Òú¹Ñ ·Ö¡áººá¹Ç¹Í¹, 6¤ÇÒÁ«ºÑ «Íé ¹, 80 àÍ¡à·È, 55, 104, 130¤ÇÒÁÅ¡Ö ¡ÒöʹÃËÊÑ , 80 ä´ºÔµ, 8¤ÇÒÁ¹èÒ¨Ð໹ ¢Í§¢Íé ¼Ô´¾ÅÒ´ÅÓ´ºÑ , 88 乤ÇÔµÊ,ì 20 »ÃÐÊ·Ô ¸ÀÔ Ò¾, 87 乤ÇÔµÊÍì Ø´Á¤µ,Ô 12 ǧ¨ÃµÃǨËÒÅӴѺ, 69 ÊÑҳú¡Ç¹, 11, 20, 21, 45, 68, 93 ÍÅÑ ¡ÍÃ·Ô ÖÁ, 69, 7580 à¤ÃÍ× §Ê¶Ò¹Ð¨Ó¡Ñ´, 7072 ¡ÒâÂÒÂ, 45, 66 á¼¹ÀÒ¾à·ÃÅÅÔÊ, 70, 7275 ¡ÒâֹÍÂèÙ¡ºÑ Ẻ¢Íé ÁÅÙ , 138140 ÊÑÅѡɳì, 21 ¡Ò÷ӹÒÂ, 117, 141ǧ¨Ã¶Í´ÃËÊÑ ¨µÔ àµÍÃì¢Í§ÊÍ× º¹Ñ ·Ö¡, 55, 61, 103, 107, ÁÍ´à٠Ū¹Ñ , 4 á¡é䢢éͼ´Ô ¾ÅÒ´, 4 138, 139ǧ¨ÃÁÍ´àÙ ÅàµÍÃ,ì 4, 5 ·Õ¢Ö¹ ÍÂè¡Ù ѺẺ¢éÍÁÙÅ, 138ǧ¨Ãà¢Òé ÃËÑÊ ·ÍÕ ÂÙ¹è ͡ᶺ¤ÇÒÁ¶Õ, 11, 20 ¡Íè ¹, 91 ÀÒÂã¹Ç§¨Ãª¡Ñ µÇÑ ÍÂèÒ§, 18 ÁÍ´à٠Ūѹ, 3 ÊÕ¢ÒÇ, 60, 119 á¡äé ¢¢éͼ´Ô ¾ÅÒ´, 3 à¡ÒÊìÊÕ¢ÒÇ, 69 à¡ÒÊÊì Õ¢ÒÇẺºÇ¡, 20, 55, 66, 75, 99,ʶһµ ¡ÃÃÁªèͧÊÑÒ³ÍèÒ¹, 11ÊÀÒ¾¤ÇÒÁ໹áÁèàËÅ¡ç , 1, 139, 152 103, 115, 138ÊÀҾźÅÒé §áÁèàËÅ¡ç , 2, 5 ẺÊÕ, 93, 99, 116, 138 Ê໡µÃÑÁ¤Òè ÈÙ¹Â,ì 8, 44, 68 ËÅÑ¡¡ÒÃàª§Ô µ§Ñ ©Ò¡, 119, 142ÊÀÒ¾ãËé«ÁÖ ¼èÒ¹ä´,é 3 ÍͿ૵ÊÁ¡ÒùÍÃÁì ÍÅ, 119 ·Ò§¤ÇÒÁ¶,Õ 22, 35ÊÑ Ò³¾ÑÅÊì ·Ò§à¿Ê, 21, 22, 33à»ÅÕ ¹Ê¶Ò¹Ð, 6, 55, 103, 130, 147 ÊÁ¡ÒÃ»ÃºÑ ¤Òè , 24, 28¡Òú¹Ñ ·Ö¡áººá¹ÇµÑ§, 6 ·Ò§àÇÅÒ, 20, 33
ÍѵÃÒ¡Òê¡Ñ µÇÑ ÍÂÒè §, 37 ¨Ø´àʶÕÂÃÀÒ¾, 32áººà¡¹Ô ¨ÃÔ§, 37 à˵ءÒó¢ì Íé ¼Ô´¾ÅÒ´, 91ÍѵÃÒ¡ÒÃÅÙèà¢Òé , 2225, 28, 38 ¡ÒÃÇÔà¤ÃÒÐË,ì 91111ÍѵÃÒ¢Íé ¼´Ô ¾ÅÒ´ºÔµ (BER), 47 ¡ÒÃÇÔà¤ÃÒÐËìÃÐÂзҧ·¹Õ éÍÂÊ´Ø , 104107굄 ÃÒÃËÊÑ , 69, 152, 154, 156굄 ÊËÊÁÑ ¾Ñ¹¸,ì 49, 60, 100, 119, 142 ¤ÇÒÁÊÁÑ ¾Ñ¹¸ìÃÐËÇèÒ§ SNReff áÅÐ BER, 107109ÍÅÑ ¡ÍÃÔ·ÁÖ ¤ÇÒÁËÁÒÂ, 93PDNP, 140144 ¹ÂÔ ÒÁ, 95PSPDNP, 144146 ÃËÑÊ RLL, 91ÇàÕ ·ÍÃìºÔ, 6980, 122 ÃÐÂзҧ»ÃÐÊ·Ô ¸Ô¼Å, 99103Ẻ»ÃºÑ µÇÑ , 143 ÃÐÂзҧ»ÃÐÊ·Ô ¸Ô¼Å¡ÓÅѧÊͧ, 101Í¤Õ ÇÍäÅà«ÍÃì, 4, 12, 47, 53, 66, 104 ·¹Õ éÍÂÊ´Ø , 101굄 ÃÒ¡ÒÃÅàÙè ¢éÒ, 67 ÃÐÂÐ·Ò§ÂØ¤ÅÔ´, 9799Ẻ zeroforcing, 138 ÃÐÂÐ·Ò§Â¤Ø Å´Ô ¡ÓÅ§Ñ Êͧ, 97Ẻ¼ÅµÍºÊ¹Í§ºÒ§ÊÇè ¹ (PR), 43, 68, ·Õ¹ Íé ÂÊØ´, 99115 ǧ¨Ãà¢éÒÃËÊÑ ¡Íè ¹, 91Ẻ¼ÅµÍºÊ¹Í§àµÁç , 67 ẹ´ìÇÔ´·ìà¤ÃÍ× §Ê¶Ò¹Ð¨Ó¡Ñ´, 70, 71 ¢Í§Å»Ù , 22, 28ÃËÊÑ RLL, 156 à¡¹Ô à»¹ÈÙ¹Âì, 20ǧ¨ÃµÃǨËÒÇÕà·ÍÃìºÔ, 71 Ẻ¢éÍÁÙÅ, 138à·¤¹¤Ô ¡ÒûÃÐÁÒ³¤èÒ㹪Çè §, 37 Ẻ¨ÓÅͧà¾Íà«ÍÃìäÇàÇÍÃäì ·ÁÁÔ§Ã¤Ô Ñ¿àÇÍÃÕ, 38 ¡Ò÷ÓãËéÊÑҳú¡Ç¹à»¹ ÊÕ¢ÒÇ, 117Ẻ·Ó§Ò¹«Ó , 40 ¡Ò÷ӧҹ¢Í§Ç§¨Ã PLL, 23àÊé¹·Ò§·Õ §Ñ ÁÕªÇÕ µÔ ÍÂ,Ùè 80, 92 ¡ÒÃÍ͡Ẻ·ÒÃàì ¡µç , 47àÊé¹â¤é§Ã»Ù µÑÇàÍÊ, 21, 3034 ªÍè §ÊÑÒ³¨Ø´ÊÁ´ØÅ, 33 GPR ẺÊÁÁÙÅ, 93
¡Òúѹ·¡Ö ÃкºáÁàè ËÅç¡, 9 ·ÕäÁµè Íè à¹×Í §·Ò§àÇÅÒẺÊÁÁÅÙ , 66 Í´Ø Á¤µÔ, 1213, 19 àÊÁÍ× ¹¨ÃÔ§, 1112 Ãкº¡Òè´Ñ à¡ºç ¢éÍÁÙÅ´¨Ô Ô·ÅÑ , 3á¼¹ÀÒ¾à·ÃÅÅÔÊ, 70, 72, 91, 115, 141ä«à¤ÔÅÊÅÔ», 33ä·ÁÁ§Ô ¨µÔ àµÍÃì, 18, 20, 39ä·ÁÁÔ§¿§ ¡ªì ¹Ñ , 30 Ẻ¹ÍÃÁì ÍÅäÅ«ì, 32ä·ÁÁ§Ô ÃԤѿàÇÍÃ,Õ 12, 1741 ¡ÒÃÍ͡Ẻ¤èÒ¾ÒÃÒÁàÔ µÍÃì, 2334 ÀÒÇСÒõ´Ô µÒÁ, 22 ÀÒÇСÒÃä´Áé Ò, 22 Ẻ´Ô¨·Ô ÑÅ, 37 Ẻ·Õã ª¡é ¹Ñ ·ÇÑ ä», 1823 »ÃÐÊ·Ô ¸ÀÔ Ò¾, 3437 Ẻ¹ÔùÂÑ , 18 Ẻ»ÃÐÁÒ³¤èÒ㹪èǧ, 37 áººÍØ»¹ÑÂ, 18
Search
Read the Text Version
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 16
- 17
- 18
- 19
- 20
- 21
- 22
- 23
- 24
- 25
- 26
- 27
- 28
- 29
- 30
- 31
- 32
- 33
- 34
- 35
- 36
- 37
- 38
- 39
- 40
- 41
- 42
- 43
- 44
- 45
- 46
- 47
- 48
- 49
- 50
- 51
- 52
- 53
- 54
- 55
- 56
- 57
- 58
- 59
- 60
- 61
- 62
- 63
- 64
- 65
- 66
- 67
- 68
- 69
- 70
- 71
- 72
- 73
- 74
- 75
- 76
- 77
- 78
- 79
- 80
- 81
- 82
- 83
- 84
- 85
- 86
- 87
- 88
- 89
- 90
- 91
- 92
- 93
- 94
- 95
- 96
- 97
- 98
- 99
- 100
- 101
- 102
- 103
- 104
- 105
- 106
- 107
- 108
- 109
- 110
- 111
- 112
- 113
- 114
- 115
- 116
- 117
- 118
- 119
- 120
- 121
- 122
- 123
- 124
- 125
- 126
- 127
- 128
- 129
- 130
- 131
- 132
- 133
- 134
- 135
- 136
- 137
- 138
- 139
- 140
- 141
- 142
- 143
- 144
- 145
- 146
- 147
- 148
- 149
- 150
- 151
- 152
- 153
- 154
- 155
- 156
- 157
- 158
- 159
- 160
- 161
- 162
- 163
- 164
- 165
- 166
- 167
- 168
- 169
- 170
- 171
- 172
- 173
- 174
- 175
- 176
- 177
- 178
- 179
- 180
- 181
- 182
- 183
- 184
- 185
- 186
- 187
- 188
- 189
- 190
- 191
- 192
- 193
- 194
- 195
- 196
- 197
- 198
- 199
- 200
- 201
- 202
- 203
- 204
- 205
- 206
- 207
- 208
- 209
- 210
- 211
- 212
- 213
- 214
- 215
- 216
- 217
- 218
- 219
- 220
- 221
- 222
- 223
- 224
- 225
- 226
- 227
- 228