concatenation of 2d matrix to form 3d matrix horizontally

hi... can any one help me in concatenate the 2d matrix to form 3d matrix my sample code is input to the sample is

ofdm_symbol=randn(8,10,2)+(1j*randn(8,10,2));
time_domain_signal(i,:,:)=abs(ifft([ofdm_symbol(i,1:4,ii) zeros(N,(L-1)*N,1) ofdm_symbol(i,5:8,ii)]))

size(ofdm_symbol(i,1:4,ii)) = 1x4 
size(ofdm_symbol(i,5:8,ii)) = 1x4
size(zeros(N,(L-1)*N,1))=     8x24

i am getting the error as

Error using horzcat
Dimensions of matrices being concatenated are not consistent.

Error in mimo_pts (line 60)
     time_domain_signal(i,:,:)=abs(ifft([ofdm_symbol(i,1:4,ii) zeros(N,(L-1)*N,1) ofdm_symbol(i,5:8,ii)]));

how to debug this sample of this code i have tried all possible combinations to get the output.