readme.txt

ofdm-mimo 仿真程序

http://web.mit.edu/brzezin/www/359/matlab/

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.