TY - JOUR
T1 - Space-time partially adaptive pre-equalizer for high rate CDMA systems using conjugate gradient technique
AU - Lin, Gau J.
AU - Lee, Ta-Sung
AU - Tan, Chan Choo
PY - 2002/9/24
Y1 - 2002/9/24
N2 - A novel space-time (ST) pre-equalizer is proposed for the downlink of high data rate CDMA systems over frequency-selective multipath channels. We consider the scenario in which multiple transmit antennas are used at the base station (BS) for downlink transmission, followed by a set of adaptive FIR filters to suppress the multiple access interference (MAI) and possible intersymbol interference (ISI). With the MAI and ISI effectively suppressed, each mobile station (MS) would require only a simple matched filter (MF), leading to a "thin" handsets design suitable for next-generation wireless communications. The tap weights of each adaptive FIR filter are determined based on the generalized sidelobe canceller (GSC) technique, and partial adaptivity is incorporated via the conjugate gradient (CG) algorithm for reduced complexity implementation. The proposed ST pre-equalizer is evaluated through simulations, and the results show that it can achieve better performance compared to the pre-RAKE maximum ratio combining (MRC) method.
AB - A novel space-time (ST) pre-equalizer is proposed for the downlink of high data rate CDMA systems over frequency-selective multipath channels. We consider the scenario in which multiple transmit antennas are used at the base station (BS) for downlink transmission, followed by a set of adaptive FIR filters to suppress the multiple access interference (MAI) and possible intersymbol interference (ISI). With the MAI and ISI effectively suppressed, each mobile station (MS) would require only a simple matched filter (MF), leading to a "thin" handsets design suitable for next-generation wireless communications. The tap weights of each adaptive FIR filter are determined based on the generalized sidelobe canceller (GSC) technique, and partial adaptivity is incorporated via the conjugate gradient (CG) algorithm for reduced complexity implementation. The proposed ST pre-equalizer is evaluated through simulations, and the results show that it can achieve better performance compared to the pre-RAKE maximum ratio combining (MRC) method.
UR - http://www.scopus.com/inward/record.url?scp=0036450590&partnerID=8YFLogxK
U2 - 10.1109/VETECF.2002.1040550
DO - 10.1109/VETECF.2002.1040550
M3 - Conference article
AN - SCOPUS:0036450590
SN - 0740-0551
VL - 56
SP - 1916
EP - 1920
JO - IEEE Vehicular Technology Conference
JF - IEEE Vehicular Technology Conference
IS - 3
M1 - 1040550
T2 - 56th Vehicular Technology Conference
Y2 - 24 September 2002 through 28 September 2002
ER -