ofdm simulator.txt

本程序利用改进的CHOW算法

OFDM Simulator

            OFDM Simulator 





            MIMO OFDM Simulator:

              OFDM.m: OFDM Simulator (outer function) 


              create_channel.m: Generates a Rayleigh fading frequency-selective 
              channel, parametrized by the antenna configuration, the OFDM 
              configuration, and the power-delay profile. 


              svd_decompose_channel.m: Since full channel knowledge is assumed, 
              transmission is across parallel singular value modes. This 
              function decomposes the channel into these modes. 


              BitLoad.m: Apply the bit-loading algorithm to achieve the desired 
              bit and energy allocation for the current channel instance. 
                ComputeSNR.m: Given the subcarrier gains, this simple function 
                generates the SNR values of each channel (each singular value on 
                each tone is a separate channel). 
                chow_algo.m: Apply Chow's algorithm to generate a particular bit 
                and energy allocation. 
                EnergyTableInit.m: Given the SNR values, form a table of energy 
                increments for each channel. 
                campello_algo.m: Apply Campello's algorithm to converge to the 
                optimal bit and energy allocation for the given channel 
                conditions. 
                  ResolvetheLastBit.m: An optimal bit-loading of the last bit 
                  requires a unique optimization. 
              modulate.m: Modulate the random input sequence according to the 
              bit allocations for each channel. 
                ENC2.mat: BPSK Modulator 
                ENC4.mat: 4-QAM Modulator (Gray coded) 
                ENC16.mat: 16-QAM Modulator (Gray coded) 
                ENC64.mat: 64-QAM Modulator (Gray coded) 
                ENC256.mat: 256-QAM Modulator (Gray coded) 
              precode.m: Precode the transmitted vector at each time instance by 
              filtering the modulated vector with the right-inverse of the 
              channel's right singluar matrix. 


              ifft_cp_tx_blk.m: IFFT block of the OFDM system. 


              channel.m: Apply the channel to the OFDM frame. 


              fft_cp_rx_blk.m: FFT block of the OFDM system. 


              shape.m: Complete the diagonalization of the channel by filtering 
              the received vector with the left-inverse of the channel's left 
              singular matrix. 


              demodulate.m: Perform a nearest neighbor search knowing the 
              transmit constellation used. 


            Details about these algorithms can be found in the final report, as 
            well as the references contained therein.