chow_algo.m

汪裕民的OFDM关键技术与应用中仿真MIMO-OFDM的源代码

function[bits_alloc,energy_alloc] = chow_algo(SNR,num_subc,M);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%   应用Chow算法实现特别的比特和能量分配
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

for i = 1:num_subc
% 假设每个子信道都是平坦衰落信道
% 初始化每个子信道的比特数
    tempbits        = log2(1+abs(SNR(i)));
    roundtempbits   = round(tempbits);  %取整
    %   将比特数限制在2～15之间
    if(roundtempbits>8)
        roundtempbits = 8;
    end
    
    if(mod(roundtempbits,2)==1&roundtempbits~=1)
        rountempbits = roundtempbits-1;
    end
    %   计算每个子信道的功率
    if(roundtempbits>0)
        energy_alloc(i) = (2^roundtempbits-1)/SNR(i);
    else
        energy_alloc(i) = 0;
    end
    %   更新每个子信道的比特率
    bits_alloc(i) = roundtempbits;
end