Title :
Frequency and time synchronization for the CDMA array-receiver STAR with interference subspace rejection
Author :
Smida, Besma ; Affes, Sofiène ; Mermelstein, Paul
Author_Institution :
INRS-EMT, Quebec Univ., Montreal, Que., Canada
Abstract :
The paper investigates the problem of CDMA multiuser detection with STAR-ISR (spatio-temporal array receiver with interference subspace rejection) in the presence of an unknown multipath channel and residual carrier offset. We observe that the performance of STAR-ISR could be seriously degraded if no frequency-offset recovery is implemented. We introduce an efficient carrier frequency offset recovery (CFOR) module into STAR-ISR. The proposed CFOR is based on space/time separation that implements a simple linear regression approach for both time-delay and frequency synchronization. We analyze the performance of STAR-ISR with and without CFOR. Simulations show that CFOR reduces the performance loss due to the frequency offset. With frequency offset of 600 Hz, the link-level gain is more than 7 dB for 8PSK users.
Keywords :
code division multiple access; delays; multipath channels; multiuser detection; phase shift keying; radio receivers; radiofrequency interference; synchronisation; CDMA array-receiver; PSK; carrier frequency offset recovery; frequency synchronization; interference subspace rejection; linear regression approach; multipath channel; multiuser detection; residual carrier offset; space/time separation; spatio-temporal array receiver; time synchronization; time-delay; Degradation; Delay effects; Detectors; Frequency synchronization; Interference; Linear regression; Multiaccess communication; Multiuser detection; Performance analysis; Performance loss;
Conference_Titel :
Vehicular Technology Conference, 2003. VTC 2003-Fall. 2003 IEEE 58th
Print_ISBN :
0-7803-7954-3
DOI :
10.1109/VETECF.2003.1285148
