宽带无线通信系统中地信道均衡研究.pdf

ABSTRACT In communicationthetransmittedis distortedthe systems signalalways by frequency- selective aimof to channel．Thethisthesisis efficient to the design equalizers mitigate channel multipathfading． A decisionfeedback is for parallelmultistage equalizerproposedsingle·carrierlayered With space-timesystemsthefixed is toadecisionfeedback cyclicprefix．Itequivalent in domain combinedwitha decision equalizerspace multipIe-input feedback single·-output in domainand equalizerfrequency timedomain．ItCanachievethe performance satisfactory withlow complexity． Anovel and receiverwith decision jointequalizationdespreading symbol-level isaddedtothe atthe feedbackis CDMA symbol-levelcyclicprefix signals presented．The transmitterside．Atthereceiver receivedwiththe removalis side，the signal cyclicprefix convertedinto domainFFT feedforwardfilteris to frequencyby algorithm．A appliedjointly thechanneland the domain．Theresidual equalize despreadsignalin疗equency inter-symbol interferenceofthe codechannelis andsubtractedfromthe corresponding