function signal = ifft_ofdm_basesignal_gen(NDLRB,maxl,a);
Ts = 1 / ( 15000 * 2048 ) ; % basic time unit £»
NRBSC = 12; % subcarriers in a resource block £»
if maxl == 7 % normal cyclic prefix ;
dealtf = 15000; % subcarrier spacing
N = 2048 ; % a constant different with subcarrier spacing £»
% insert 0 in the middle of all subcarribers for ifft ;
for l=1:maxl
a (( NDLRB * NRBSC / 2 + 2 ) : ( NDLRB * NRBSC + 1 ) , l ) = a (( NDLRB * NRBSC / 2 + 1 ) : NDLRB * NRBSC , l ) ;
a ( ( NDLRB * NRBSC / 2 + 1 ) , l ) = 0 ;
end
% coefficient of ifft ;
for n = 1 : N ;
e ( n ) = exp( j * 2 * pi / N * ( - floor( NDLRB * NRBSC / 2 ) ) * ( n - 1 ) );
end
e = [e;e;e;e;e;e;e];
e1 = e.';
% ifft ;
signal0 = e1 .* ifft ( a , N )*N ;
% add cp ;
for l = 1 : maxl
if l == 1
TCP = 160 ;
CP = signal0 ( ( N-TCP+1 ) : N ,l) ;
signal ( 1 : TCP , l ) = CP;
signal ( ( TCP + 1 ) : ( TCP + N ) , l ) = signal0 ( : , l );
elseif l > 1
TCP = 144 ;
CP = signal0 ( ( N-TCP+1 ) : N , l ) ;
signal ( 1 : TCP , l ) = CP;
signal ( ( TCP + 1 ) : ( TCP + N ) , l ) = signal0 ( : , l );
end
end
end
if maxl == 6 % extended cyclic prefix and subcarrier spacing of 15KHz
dealtf = 15000;
N = 2048 ;
TCP = 512 ;
signal = zeros ( ( N + TCP ) , maxl );
% insert 0 in the middle of all subcarribers for ifft ;
for l = 1 : maxl ;
a (( NDLRB * NRBSC / 2 + 2 ) : ( NDLRB * NRBSC + 1 ) , l ) = a (( NDLRB * NRBSC / 2 + 1 ) : NDLRB * NRBSC , l ) ;
a ( ( NDLRB * NRBSC / 2 + 1 ) , l ) = 0 ;
end
% coefficient of ifft ;
for n = 1 : N ;
e ( n ) = exp( j * 2 * pi / N * ( - floor( NDLRB * NRBSC / 2 ) ) * ( n - 1 ) );
end
e = [e;e;e;e;e;e];
e1 = e.';
% ifft ;
signal0 = e1 .* ifft ( a , N )*N ;
% add cp ;
for l = 1 : maxl
CP = signal0 ( ( N-TCP + 1 ) : N , l ) ;
signal ( 1 : TCP , l ) = CP;
signal ( ( TCP + 1 ) : ( N + TCP ) , l ) = signal0 ( : , l );
end
end
if maxl == 3 % extended cyclic prefix and subcarrier spacing of 7.5KHz
dealtf = 7500 ;
N = 4096 ;
TCP = 1024 ;
signal = zeros ( ( N + TCP ) , maxl );
% insert 0 in the middle of all subcarribers for ifft ;
for l = 1 : maxl ;
a (( NDLRB * NRBSC / 2 + 2 ) : ( NDLRB * NRBSC + 1 ) , l ) = a (( NDLRB * NRBSC / 2 + 1 ) : NDLRB * NRBSC , l ) ;
a ( ( NDLRB * NRBSC / 2 + 1 ) , l ) = 0 ;
end
% coefficient of ifft ;
for n = 1 : N ;
e ( n ) = exp( j * 2 * pi / N * ( - floor( NDLRB * NRBSC / 2 ) ) * ( n - 1 ) );
end
e = [e;e;e];
e1 = e.';
% ifft ;
signal0 = e1 .* ifft ( a , N )*N ;
% add cp ;
for l = 1 : maxl ;
CP = signal0 ( ( N-TCP + 1 ) : N , l ) ;
signal ( 1 : TCP , l ) = CP;
signal ( ( TCP + 1 ) : ( N + TCP ) , l ) = signal0 ( : , l );
end
end
PDCCH 链路级仿真
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2011-03-24
16:39:05
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PDCCH.zip （35个子文件） 
PDCCH 
mapping.m 1KB mapping.asv 1KB ifft_ofdm_basesignal_gen.asv 3KB zuixinmapping.m 2KB qpsk_mod.m 730B pre_aSingleAntennaPort.m 71B aSingleAntennaPort.m 90B pre_transmitDiversity.m 859B R_EG.m 419B layerMappingForTransmitDiversity.asv 612B qpsk_de_mod.m 1KB pre_transmitDiversity.asv 851B de_mapping.asv 1KB de_mapping.m 1KB ifft_ofdm_basesignal_gen.m 3KB scrambling.asv 542B de_layermap.asv 1KB zuixinmapping.asv 2KB subblock_interleaver.m 1KB qpsk_mod.asv 447B qpsk_de_mod.asv 1KB scrambling.m 472B pseudo.m 1KB PDCCH_CCE.asv 1KB PDCCH.m 3KB subblock_interleaver.asv 1KB pre_aSingleAntennaPort.asv 78B PDCCH_CCE.m 1KB de_fft_ofdm_basesignal_gen.m 2KB layerMappingForTransmitDiversity.m 715B ifft_basesignal_gen.m 3KB layermap.m 2KB PDCCH.asv 3KB de_layermap.m 1KB pseudo.asv 1KB资源评论
zyheyu2014-07-30不是很全面- zheng198704172013-04-25不是很懂，看来自己需努力
- WJFAND2013-01-14这是一个简单的链路级仿真程序，包括层映射，OFDM映射一些基本的东西，对于初学者是个很不错的程序
- jinxuzi19822013-02-08优点：程序不是太大，有利于代码的掌握 缺点：程序错误很多，尤其是zuixinmapping.m函数。程序在变量初始化方面做的不好，从注释来看，应该是国外某大学的代码，出现如此多低级错误，怀疑是上传者人为设置的。不管怎么说，该代码是很有价值的代码。入口函数应该是PDCCH.m。
- babydoll02042014-07-13程序错误很多。
