TY - GEN

T1 - A Monte-Carlo implementation of the SAGE algorithm for joint soft multiuser and channel parameter estimation

AU - Panayirci, E.

AU - Kocian, A.

AU - Poor, H. Vincent

AU - Ruggieri, M.

PY - 2009

Y1 - 2009

N2 - An efficient, joint transmission delay and channel parameter estimation algorithm is proposed for uplink asynchronous direct-sequence code-division multiple access (DS-CDMA) systems based on the space-alternating generalized expectation maximization (SAGE) framework. The marginal likelihood of the unknown parameters, averaged over the data sequence, as well as the expectation and maximization steps of the SAGE algorithm are derived analytically. To implement the proposed algorithm, a Markov Chain Monte Carlo (MCMC) technique, called Gibbs sampling, is employed to compute the a posteriori probabilities of data symbols in a computationally efficient way. Computer simulations show that the proposed algorithm has excellent estimation performance. This so-called MCMC-SAGE receiver is guaranteed to converge in likelihood.

AB - An efficient, joint transmission delay and channel parameter estimation algorithm is proposed for uplink asynchronous direct-sequence code-division multiple access (DS-CDMA) systems based on the space-alternating generalized expectation maximization (SAGE) framework. The marginal likelihood of the unknown parameters, averaged over the data sequence, as well as the expectation and maximization steps of the SAGE algorithm are derived analytically. To implement the proposed algorithm, a Markov Chain Monte Carlo (MCMC) technique, called Gibbs sampling, is employed to compute the a posteriori probabilities of data symbols in a computationally efficient way. Computer simulations show that the proposed algorithm has excellent estimation performance. This so-called MCMC-SAGE receiver is guaranteed to converge in likelihood.

KW - Asynchronous DS-CDMA

KW - Gibbs sampling

KW - Markov chain monte carlo (MCMC)

KW - Space-alternating generalized expectation maximization(SAGE)

UR - http://www.scopus.com/inward/record.url?scp=70449553490&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=70449553490&partnerID=8YFLogxK

U2 - 10.1109/SPAWC.2009.5161876

DO - 10.1109/SPAWC.2009.5161876

M3 - Conference contribution

AN - SCOPUS:70449553490

SN - 9781424436965

T3 - IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC

SP - 702

EP - 706

BT - 2009 IEEE 10th Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2009

T2 - 2009 IEEE 10th Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2009

Y2 - 21 June 2009 through 24 June 2009

ER -