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 -