大佬们，reshape函数错误使用，请勿改变元素数目是怎么回事

我和玲佑有个约

clear;
clc;
fprintf('OFDM仿真\n');
carr=256;  
sym_c=10;
M=4;
bit_sym=log2(M);
IFFT_n=1024;  
r=1/4;
SNR=10;
sum=carr*sym_c*bit_sym;
signal=randi(1,sum,2);
sumQ=sum/bit_sym;
imag_tmp=sqrt(-1);  
QPSK=[-1+imag_tmp,-1-imag_tmp,1+imag_tmp,1-imag_tmp];
SIGNAL=zeros(1,sumQ);  
QPSK_sig=zeros(1,sumQ);  
SIGNALtmp=reshape(signal,bit_sym,sumQ);
一直显示reshape函数错误使用