modulate.m
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上传日期:2013-06-24
资源大小:177k
文件大小:1k
源码类别:
matlab例程
开发平台:
Matlab
- function y = modulate(x,b,e, s2,s4,s16,s64,s256)
- % function y = modulate(x,b,e, s2,s4,s16,s64,s256)
- %
- % y - modulated output, in the form of a row vector
- % x - a vector of input bits, for all the subcarriers (row vector)
- % b - subcarrier bit allocation (64 elements in this matrix, each one
- % corresponding to the number of bits to be allocated to the subcarrier
- % having the same index)
- % e - subcarrier energy allocation (64 elements in this matrix, each one
- % corresponding to the energy to be allocated to the subcarrier
- % having the same index)
- % s_ - the encoder for a given constellation size
- y=[];
- b2 = zeros(1,length(b));
- b2(1) = 1;
- for i = 1:length(b)
- b2(i+1) = b(i) + b2(i);
- end
- for i = 1:length(b)
- switch b(i)
- case {1}
- y = [y s2(x(b2(i))+1)*sqrt(e(i))];
- case {2}
- y = [y s4(x(b2(i):(b2(i+1)-1))*[2;1]+1)*sqrt(e(i))];
- case {4}
- y = [y s16(x(b2(i):(b2(i+1)-1))*[8;4;2;1]+1)*sqrt(e(i))];
- case {6}
- y = [y s64(x(b2(i):(b2(i+1)-1))*[32;16;8;4;2;1]+1)*sqrt(e(i))];
- case {8}
- y = [y s256(x(b2(i):(b2(i+1)-1))*[128;64;32;16;8;4;2;1]+1)*sqrt(e(i))];
- otherwise
- % must be zero bits allocated
- y = [y 0];
- end
- end