针对3GPP长期演进(LTE)系统中使用的混合自动重发反馈(HARQ)技术在数据重传时占用资源块的问题,提出了一种基于频率资源分组的数据重传方法.根据使用的频带宽度,将频率资源分解成资源块组,在原固定资源基础上引入组号判定和资源块选择,以获得更高的分集增益.建立数据重传方法的HARQ模型,结合增量冗余(IR)和Chase合并技术进行验证,仿真结果表明在信道条件较差时,所提方法的误块率(BLER)性能约提升了1.2 dB,并且减少了平均重传次数.%Concerning the optimization of resource blocks during the Hybrid Automatic Repeat reQuest (HARQ) process in Long Term Evolution (LTE) system, a new method of data retransmission based on grouping of frequency resources reelection was proposed. The frequency resources were grouped according to the used bandwidth, and the introduction of group number judgement and frequency resource block selection could obtain higher diversity gain. With the constructed HARQ model incorporating Incremental Redundancy (IR) and Chase combining technique, the simulation results indicate that the improved method can enhance the Block Error Ratio (BLER) performance with 1. 2 dB in poor channel condition and reduce the average number of retransmission.
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