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比较了正交频分复用(OFDM)中常用的四种调制解调工作模式,并对BPSK、QPSK、16QAM和64QAM四种调制方式的通用调制解调模块进行了优化设计,使之能根据接收端的误码率状况进行自动调整调制,采用共享64QAM映射表整合16QAM映射表ROM,通过对BPSK和QPSK的解调分析,由于星座点比较少,判决最后可以转换成映射关系,并将实部和虚部分别进行。利用共享寄存器、数据选择器、减法器等器件进行数据优化整合运算。通过FPGA的仿真,对几种调制模式的资源消耗进行比较,在不影响性能的基础上优化后的资源占用得到极大降低。
The four modulation and demodulation modes commonly used in orthogonal frequency division multiplexing (OFDM) are compared, and the general modulation and demodulation modules of four modulation modes, BPSK, QPSK, 16QAM and 64QAM, are optimized and designed according to The receiving side of the error rate status of automatic adjustment modulation, the use of shared 64QAM mapping table integration 16QAM mapping table ROM, BPSK and QPSK by demodulation analysis, as constellation points less, the final decision can be converted into a mapping relationship, and the real part And imaginary part separately. Use shared registers, data selectors, subtractors and other devices for data optimization and integration operations. Through the simulation of FPGA, the resource consumption of several modulation modes are compared, and the optimized resource consumption is greatly reduced without affecting the performance.