求大神解答。MIMO-OFDM Wireless Communications with MATLAB的源程序有问题

[zhenyuanpou6956]

在CSDN上下载的源程序，运行后出现此类问题。
function [data_est,state_est] = STTC_detector(sig,dlt,slt,ch_coefs)

%MIMO-OFDM Wireless Communications with MATLAB㈢ Yong Soo Cho, Jaekwon Kim, Won Young Yang and Chung G. Kang
%?2010 John Wiley & Sons (Asia) Pte Ltd

[step_final,space_dim,N_packets] = size(sig);
[s,md,foo] = size(dlt);
qam16=[1 1;2 1;3 1;4 1;4 2;3 2;2 2;1 2;1 3;2 3;3 3;4 3;4 4;3 4;2 4;1 4];
for k = 1:N_packets
metric(1,2:s) = realmax;
for l = 1:step_final
for m = 1:s % current m
[s_pre,~] = find(slt==m);
pos = mod(m-1,md) + 1;
data_test = dlt(s_pre,pos,:);
data_test = reshape(data_test,[md 2]);
if md==16 % 16QAM
for r = 1:2
k1(:,r) = qam16(data_test(:,r)+1,1);
k2(:,r) = qam16(data_test(:,r)+1,2);
end
q_test = (2*k1-md-1) - j*(2*k2-md-1);
else % 4,8PSK
expr = j*2*pi/md;
q_test = exp(expr*data_test);
end
metric_d = branch_metric(sig(l,:,k),q_test,ch_coefs(:,:,k));
metric_md = metric(l,s_pre)' + metric_d;
[metric_min,metric_pos] = min(metric_md);
metric(l+1,m) = metric_min;
vit_state(l+1,m) = s_pre(metric_pos);
vit_data(l+1,m) = pos - 1;
end
end
[foo,state_best] = min(metric(end,:));
state_est(step_final + 1) = state_best;
for l = step_final:-1:1
state_est(l) = vit_state(l+1,state_est(l+1));
data_est(l,:,k) = vit_data(l+1,state_est(l+1));
end
end
运行出现错误：Not enough input arguments.