知识与财富的链接
在3GPP LTE物理层协议中,信道质量指示(channel quality indicator,CQI)与混合自动重传请求应答(hybrid automatic repeat-request acknowledgement,HARQ-ACK)均采用了基于Reed-Muller码的超码编码方式。与TD-SCDMA物理层协议中的TFCI（transport format combination indicator）编码类似,但3GPP LTE系统中的编码矩阵采用了更复杂的交织技术,增加了更多的掩码,这使得接收端的译码难度增大。针对3GPP LTE系统中编码矩阵的特点,利用快速哈达玛变换(fast Hadamard transformation,FHT),给出了一种快速的译码算法。仿真结果表明了该算法的有效性,该算法已应用于LTE-TDD无线综合测试仪表的开发中。
In 3GPP LTE (long term evolution) physical layer protocol, Both CQI (channel quality indicator) and HARQ-ACK (hybrid automatic repeat request acknowledgement) adopted a method called super code based on Reed-Muller. It is similar to the encoding of TFCI (transport format combination indicator) in TD-SCDMA physical layer protocol. But the coding matrix used more complex interleaver technology and increased more masks in 3GPP LTE. It made receiver s decoding difficult. According to the characteristics of coding matrix, this paper used FHT (fast Hadamard transformation) and gave an effective decoding algorithm of Reed-Muller. Simulation results show the effectiveness of the algorithm, which has been applied to LTE-TDD wireless integrated test instrument.