Title :
Burst-by-burst adaptive joint detection CDMA
Author :
Kuan, E.L. ; Wong, C.H. ; Hanzo, L.
Author_Institution :
Dept. of Electron. & Comput. Sci., Southampton Univ., UK
Abstract :
Adaptive quadrature amplitude modulation (AQAM) is combined with joint detection code division multiple access (JD-CDMA) in order to increase the throughput of a communications system, while maintaining a target BER. The QAM modes are adaptively switched, by estimating the signal to interference plus noise ratio (SINR) at the output of the joint detection receiver. For an eight-user AQAM/JD-CDMA scheme, a bits per symbol (BPS) performance of about 3.5 bits/symbol is achieved at an average SNR of about 18 dB, with a BER of approximately 0.02%, when using three different modulation modes, namely BPSK, 4-QAM and 16-QAM
Keywords :
adaptive modulation; adaptive signal detection; code division multiple access; error statistics; interference suppression; intersymbol interference; multiuser channels; phase shift keying; quadrature amplitude modulation; radio receivers; 16-QAM; 4-QAM; AQAM; AQAM/JD-CDMA; BER; BPSK; CDMA; ISI; SINR estimation; adaptive quadrature amplitude modulation; adaptive switching; average SNR; bits per symbol; burst-by-burst adaptive joint detection; communications system throughput; intersymbol interference; joint detection receiver; modulation modes; multiple access interference; signal to interference plus noise ratio; Adaptive signal detection; Binary phase shift keying; Bit error rate; Communication switching; Interference; Multiaccess communication; Quadrature amplitude modulation; Quadrature phase shift keying; Signal to noise ratio; Throughput;
Conference_Titel :
Vehicular Technology Conference, 1999 IEEE 49th
Conference_Location :
Houston, TX
Print_ISBN :
0-7803-5565-2
DOI :
10.1109/VETEC.1999.780673
