Near-Optimal Detection in MIMO Systems Using Gibbs Sampling

Date Added: Oct 2009
Format: PDF

In this paper the authors study a Markov Chain Monte Carlo (MCMC) Gibbs sampler for solving the integer least-squares problem. In digital communication the problem is equivalent to performing Maximum Likelihood (ML) detection in Multiple-Input Multiple-Output (MIMO) systems. While the use of MCMC methods for such problems has already been proposed, the method is novel in that they optimize the "Temperature" parameter so that in steady state, i.e. after the Markov chain has mixed, there is only polynomially (rather than exponentially) small probability of encountering the optimal solution. More precisely, they obtain the largest value of the temperature parameter for this to occur, since the higher the temperature, the faster the mixing.