TY - GEN
T1 - Design of reduced-rank MMSE combiner in asynchronous MC-DS-CDMA
AU - Hwang, Chien Hwa
AU - Chien, Feng-Tsun
PY - 2008/9/12
Y1 - 2008/9/12
N2 - In this paper, we consider the design of a reduced-rank minimum mean-squared error (MMSE) combiner in an asynchronous multicarrier-direct sequence-code division multiple access (MC-DS-CDMA) system. It is shown that the combiner weights are related to quantities whose expressions resembles the eigenvalue moments of the interference autocorrelation matrix. To lift the burden of recomputing the weights from time to time, the weights are evaluated in a large system regime and averaged over random parameters including asynchronous delays, correlated fading coefficients and spreading sequences. Explicit expressions for the asymptotic weights of the MMSE combiner are derived. The large system setting is with the spreading gain N and user number K approaching infinity, but K/N = β and the number of sub-carriers both finite.
AB - In this paper, we consider the design of a reduced-rank minimum mean-squared error (MMSE) combiner in an asynchronous multicarrier-direct sequence-code division multiple access (MC-DS-CDMA) system. It is shown that the combiner weights are related to quantities whose expressions resembles the eigenvalue moments of the interference autocorrelation matrix. To lift the burden of recomputing the weights from time to time, the weights are evaluated in a large system regime and averaged over random parameters including asynchronous delays, correlated fading coefficients and spreading sequences. Explicit expressions for the asymptotic weights of the MMSE combiner are derived. The large system setting is with the spreading gain N and user number K approaching infinity, but K/N = β and the number of sub-carriers both finite.
UR - http://www.scopus.com/inward/record.url?scp=51249106650&partnerID=8YFLogxK
U2 - 10.1109/ICC.2008.269
DO - 10.1109/ICC.2008.269
M3 - Conference contribution
AN - SCOPUS:51249106650
SN - 9781424420742
T3 - IEEE International Conference on Communications
SP - 1388
EP - 1392
BT - ICC 2008 - IEEE International Conference on Communications, Proceedings
Y2 - 19 May 2008 through 23 May 2008
ER -