MIMO-OFDM系统低面积可配置K-Best检测器设计与实现

Design and implementation of low-area configurable K-Best detector for MIMO-OFDM system

为了解决K-Best检测器资源开销大和多调制方式支持困难的问题,提出了一种适用于802.11n MIMO-OFDM系统的K-Best检测器,其具有低面积和模式可配置的特点。通过分时共享树形搜索的处理单元策略、各层时分复用处理单元进行搜索处理,仅通过增加少量存储器单元实现单个树形搜索单元资源共享。在架构上进行优化设计,通过模式配置实现多调制模式可配置化。在802.11n2×2 MIMO-OFDM系统平台中,测试结果验证了该检测器在BPSK,QPSK,16QAM及64QAM下的功能和性能,采用各层时分复用的树形搜索单元资源开销仅是串行树形搜索的48%,在80 MHz工作频率下,56个子载波树形搜索延时为176个时钟周期,即2.2μs。

To solve the high-cost resource and support multi-mode modulation,a low-area configurable K-Best detector was proposed for 802.11 n MIMO-OFDM（multiple input multiple output and orthogonal frequency dirision multiplexing）system.By sharing the processing element,each layer works in the timedivision multiplexing,only by adding a small amount of memory unit to achieve a single tree search unit resource sharing.By optimizing the design of the structure,multi modulation mode was realized by mode configuration.In the 802.11n2×2 MIMO-OFDM system,testing results validate the function and performance of the detector in the configurations of BPSK,QPSK,16 QAM and 64 QAM.The resource cost of tree search in time-division multiplexing is only 48% of that in serial tree search.When system clock is80 MHz,the latency of processing 56 subcarriers is 176 clocks or 2.2μs.