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An enhanced scheme is proposed for high code rate low density parity check (LDPC) coded partial incremental redundancy (PIR) hybrid automatic repeat request (HARQ). It employs the unequal error protection (UEP) technique for incremental redundancy bits and uses the constellation rearrangement (CoRe) technique for information bits in retransmissions so as to reduce the reliability variances of all encoded bits after soft combining. Simulation results show that the proposed scheme applies to both regular LDPC and irregular LDPC cases and can efficiently improve frame error rate (FER) performance and throughput performance. 相似文献
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The high-speed downlink packet access(HSD-PA)[1,2]is currently being standardized in3GPPforrelease5and release6.The main goal of HSDPAisto allow wideband code division multiple access(WCDMA)to support downlink peak data rates inthe range of approxi mately8-10Mbit·s-1for besteffort packet-data services[3,4].One major link adaptation(LA)technique em-ployedfor HSDPAis adaptive modulation and coding(AMC).The principle of AMCistochangethe mod-ulation and coding scheme(MCS)in accordan… 相似文献
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The throughput performance of modulation and coding schemes (MCS) selection with channel quality estimation errors (CQEE) is analyzed for high-speed downlink packet access (HSDPA). To reduce the loss of throughput caused by CQEE, the robust MCS selection method and adaptive MCS switching scheme are proposed. In addition, automatic repeat request (ARQ) scheme is used to improve the block error rate (BLER) performance. Simulation results show that the proposed methods decrease the throughput loss resulted from CQEE efficiently and BLER performance gets better with ARQ scheme. 相似文献
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