简介：ItisgenerallyacknowledgedthatmobilecommunicationbasestationsarecomposedofhardwarecomponentssuchasFieldProgrammingGateArray(FPGA),DigitalSignalProcessor(DSP),whichpromisereliableandfluentservicesforthemobileusers.However,withtheincreasingdemandforenergy-efficiency,approachesoflowpower-consumptionandhigh-flexibilityareneededurgently.Inthiscircumstance,GeneralPurposeProcessor(GPP)attractspeople'sattentionforitslow-costandflexibility.BenefitedfromthedevelopmentofmodernGPPinmulti-core,SingleInstructionMultipleData(SIMD)instructions,largercache,etc.,GPPsarecapableofperforminghigh-densitydigitalprocessing.Inthispaper,wecompareseveralsoftware-definedradio(SDR)prototypesandproposethegeneralarchitectureofGPP-basedsoftbasestations.Then,theschematicdesignofresourceallocationandalgorithmoptimizationinsoftbasestationimplementationarestudied.Asanapplicationexample,aprototypeofGPP-basedsoftbasestationreferringtothe3rdGenerationPartnershipProject(3GPP)LongTermEvolution(LTE)isrealizedandevaluated.Tothebestofourknowledge,itisthefirstSoft-LTEprototypeeverreported.Intheend,weevaluatethetimingperformanceoftheLTEsoftbasestationandapacketlossratiooflessthan0.003isobtained.

简介：多进制正交振幅调制（MQAM）是在中、大容量数字通信系统大量使用的一种载波键控方式。MQAM是对载波的振幅和相位同时进行调制的一种复合的调制形式．他同时利用了载波的幅度和相位来传递信息比特。在调制的进制数较高时，信号矢量集的分布也比较合理，同时实现起来也比较方便，具有更大的符号率，从而获得更高的系统效率。通常由符号率确定占用带宽，因此每个符号的比特（基本信息单元）越多，效率就越高：基于地面数字电视国标ADTB—T规格，采用了一种QAM软判决解映射算法，其中以32QAM为倒进行说明其性能良好．有较好的可行性。