IEEE802.11a的OFDM基带调制的FPGA实现

Implementation of OFDM Baseband of IEEE802.11a Based on FPGA

针对802.11无线局域网设计当中OFDM调制端基带部分的成形,提出了FPGA的具体实现方法。在数据的突发方式和连续方式下采取基于流量控制的缓冲机制,并在导频插入以及频谱安排的实现上采用FIFO加RAM的方式,对于PLCP前导训练序列直接从ROM中查表截入。采用BPSK和16QAM两种调制方式,设计中在一定程度上采用争取硬件资源换取延迟的做法。经验证,系统的频谱结构以及时域帧结构都满足设计要求,并且时延较小。

In this paper,according to the 802.11 wireless LAN baseband OFDM modulation,the specific FPGA implementations are given.And a buffer-based flow control mechanism is used for data burst mode and continuous mode.And for the insertion in the pilot,as well as arrangements for the realization of the spectrum,FIFO plus RAM approach is used.As for the PLCP training sequence,a look-up table based on ROM is designed.BPSK and 16QAM modulation modes are used.A smaller delay would rather welcome than a less consumption of resource of hardware in this design.The spectrum structure and time-domain frame structures meet the design requirements through the verification,and perform better in the property of time delay.