Title :
Improved multiuser detector for fast FH/MFSK systems with soft-limiter
Author :
Zhang, Hui ; Yang, Huazhong ; Luo, Rong ; Wang, Hui
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing
Abstract :
In this paper, a modified multiuser detection scheme of the iterative interference cancellation (IIC) is proposed to reduce multiple access interference (MAI) in fast frequency hopping/multilevel frequency shift keying (FH/MFSK) systems. The proposed detector adopts diversity combining with soft-limiter in the IIC detector and simulation results show that the performance of the proposed detector can be improved significantly in a frequency-selective fading channel. The bit error rate (BER) of the proposed detector is about 2x to 10x smaller than that of the IIC detector for systems with frequency slots M=128, diversity order L=7, the number of users K=30 to 80, and the average bit energy-to-noise density ratio Eb/N0=25 dB
Keywords :
error statistics; fading channels; frequency hop communication; frequency shift keying; interference suppression; iterative methods; multiuser detection; radio receivers; BER; FH-MFSK system; IIC detector; MAI; bit error rate; fast frequency hopping-multilevel frequency shift keying system; frequency-selective fading channel; iterative interference cancellation; multiple access interference; multiuser detector; soft-limiter; Bit error rate; Detectors; Diversity reception; Fading; Frequency diversity; Frequency shift keying; Galois fields; Interference cancellation; Multiple access interference; Multiuser detection; Frequency-hopping communication; interference suppression; multiuser detection;
Conference_Titel :
Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2005. MAPE 2005. IEEE International Symposium on
Conference_Location :
Beijing
Print_ISBN :
0-7803-9128-4
DOI :
10.1109/MAPE.2005.1618201
