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提出了一个基于2×2天线阵列的混合自动请求重传(HARQ)算法.首先传输贝尔实验室分层码(BLAST)来提高速率,当出错重传时,重传信号能和初始的信号组合为空时分组码(STBC).由于BLAST能提供很高的速率但是抗干扰能力不强,而STBC能很好地抵抗干扰,这样两者的结合就极大地增强了系统吞吐率和鲁棒性.本算法结合了BLAST和STBC的优势,在获得多天线复用增益的同时也能获得分集增益,是一个兼顾速率和误码率性能的HARQ方案.理论分析和仿真都表明本HARQ方案能比单纯使用BLAST或者STBC的ARQ方案获得更好的性能.
A Hybrid Automatic Repeat Request (HARQ) algorithm based on 2 × 2 antenna array is proposed.At first, the Bell Labs Hierarchical Code (BLAST) is transmitted to increase the rate, and when the retransmission error occurs, the retransmitted signal can be combined with the initial signal Space-Time Block Code (STBC). Since BLAST provides high rates but low anti-jamming capability and STBC is very robust against interference, the combination of both greatly increases system throughput and robustness The algorithm combines the advantages of BLAST and STBC and obtains the diversity gain while gaining the multiplexing gain of multiple antennas, which is a HARQ scheme that takes into account both rate and bit error rate performance.The theoretical analysis and simulation show that the proposed HARQ scheme Use the ARQ scheme of BLAST or STBC for better performance.