【摘要】：針對傳統(tǒng)編碼協(xié)作體制在信道條件動態(tài)變化的移動場景中存在較嚴重的性能損失問題,提出一種碼率兼容低密度奇偶校驗(LDPC)碼與混合自動重傳請求(HARQ)協(xié)議相結合的新型自適應編碼協(xié)作體制。假設信道狀態(tài)信息在每次傳輸時發(fā)生變化,通過不等長增量冗余的自動重傳,協(xié)作節(jié)點與目的節(jié)點處的等效碼率隨信道條件變化而獲得自適應非線性調(diào)整。推導所提體制的中斷概率與吞吐量等系統(tǒng)性能表達式,并給出理論分析及仿真結果。實驗結果表明,在適當?shù)募嫒荽a率設計下,所提體制與傳統(tǒng)體制和等長傳輸體制相比較可有效降低系統(tǒng)中斷概率,提高系統(tǒng)的吞吐量,改善移動環(huán)境下協(xié)作通信系統(tǒng)的傳輸可靠性。
[Abstract]:In view of the serious performance loss problem of traditional coded cooperative schemes in mobile scenarios with dynamic changes of channel conditions, A new adaptive coding cooperation scheme is proposed, which combines bit-rate compatible low-density parity-check (LDPC) codes with hybrid automatic retransmission request (HARQ) protocol. Assuming that the channel state information changes during each transmission, the adaptive nonlinear adjustment is obtained by automatically retransmitting the unequal length incremental redundancy, and the equivalent rate between the cooperative node and the destination node varies with the channel conditions. The performance expressions of the proposed system, such as interrupt probability and throughput, are derived, and the theoretical analysis and simulation results are given. The experimental results show that the proposed scheme can effectively reduce the interrupt probability and improve the throughput of the system compared with the traditional system and the equal length transmission scheme under the appropriate compatible rate design. Improve the transmission reliability of cooperative communication system in mobile environment.
【作者單位】： 廈門市移動多媒體通信重點實驗室(華僑大學);綜合業(yè)務網(wǎng)理論及關鍵技術國家重點實驗室(西安電子科技大學);
【基金】：國家自然科學基金資助項目(61302095) 福建省自然科學基金資助項目(2014J01243,2014J05076) 華僑大學科研基金資助項目(13Y0384,12BS219)
【分類號】：TN911.22

【參考文獻】

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本文編號：2451501