Graph-based Iterative Gaussian Detection with Soft Channel Estimation for MIMO Systems


T. Wo, C. Liu, P. A. Hoeher,


        Conventionally, the uncertainties of channel coefficients are neglected, that is the estimated values of channel
coefficients are taken as the true values in the stage of data detection. In the communications community, it is
still an open question how to take into account the channel uncertainty for data detection/decoding, especially
in a low-complexity manner. In this paper, we propose a low-complexity receiver algorithm which utilizes soft
channel information. Channel coefficients are treated as variables and estimated in an element-wise manner. Their
uncertainties are represented by the variances. Instead of performing channel estimation and data detection in a
separate manner, this algorithm does everything in one stage, i.e., channel estimation and data detection/decoding
are carried out simultaneously over a general factor graph. The feasibility of this algorithm is verified by means
of Monte-Carlo simulations both in bit error ratio (BER) and channel estimation mean squared error (MSE).

BibTEX Reference Entry 

	author = {Tianbin Wo and Chunhui Liu and Peter Adam Hoeher},
	title = "Graph-based Iterative {G}aussian Detection with Soft Channel Estimation for {MIMO} Systems",
	booktitle = "7th International ITG Conference on Source and Channel Coding (SCC 08)",
	address = {Ulm, Germany},
	month = Jan,
	year = 2008,


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