Title :
Capacity of the linear decorrelating detector for QS-CDMA
Author :
Ghauri, Irfan ; Iltis, Ronald A.
Author_Institution :
Dept. of Mobile Commun., Eurecom Inst., Sophia Antipolis, France
fDate :
9/1/1997 12:00:00 AM
Abstract :
We study the performance and capacity of a quasi-synchronous code-division multiple-access (QS-CDMA) cellular system employing the decorrelating detector. It is assumed that each of N users has a GPS generated local clock, and attempts to transmit in synchrony with the other users in its cell. The detector makes use of the small timing uncertainties to build the interference signal space and perfectly cancel the interference. Results are compared with those of an adaptive MSE receiver. It is shown that when the LMS adaptive algorithm is employed, the mean-squared-error misadjustment significantly affects the receiver performance. Finally, system capacities in terms of users/cell are evaluated
Keywords :
cellular radio; code division multiple access; correlation methods; interference suppression; land mobile radio; radio receivers; radiofrequency interference; synchronisation; GPS generated local clock; LMS adaptive algorithm; QS-CDMA; capacity; interference signal space; linear decorrelating detector; mean-squared-error misadjustment; performance; quasi-synchronous code-division multiple-access cellular system; receiver performance; timing uncertainties; Clocks; Decorrelation; Detectors; Global Positioning System; Interference cancellation; Least squares approximation; Multiaccess communication; Synchronization; Timing; Uncertainty;
Journal_Title :
Communications, IEEE Transactions on
