MMA是改进的CMA，有RCA和CMA的优点，还能对相位误差进行修正。

N = 5e5;                    % 仿真符号数
M = 16;                     % QAM16

msg = randi([0 M-1],N,1);   % 产生随机符号
tx = qammod(msg,M);         % QAM调制

test_snr = 20:5:30;         % 信噪比测试

% 模拟多径信道
h = [0.05,0.1+0.15*1j,0.9-0.15*1j,0.15,-0.1+0.2*1j,0.1+0.2*1j,-0.01+0.15*1j];

ch = conv(tx,h,'same');     % 过信道

mu = 3e-5;                  % 收敛步进

% 输出
qout = zeros(length(ch),length(test_snr));

for j = 1:length(test_snr)
    
    rx = awgn(ch,test_snr(j),'measured'); % 添加噪声

    wn = zeros(11,1);        % 初始化横向滤波器系数
    wn(5) = 1;               % 随机初始化
    
    for i = 1:length(rx)-10
        xn = flipud(rx(i:i+10));  % 均衡输入  xn,...,x2,x1,x0
        yn = sum(xn.*wn);         % 均衡输出

        enr = real(yn)*(real(yn)^2-8.2);
        eni = imag(yn)*(imag(yn)^2-8.2);
        en = enr+eni*1i;    % 均衡估计误差
        
        wn = wn - mu.*en*conj(xn);% 更新均衡系数
        qout(i,j) = yn;           % 输出
    end 

end

% 绘图
scatterplot(rx(end-1e4:end));
for i = 1:length(test_snr)
    scatterplot(qout(end-1e4:end,i));
en