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Improved Multiuser Detector for Fast FH/MFSK Systems with Soft-limiter

机译:具有软限幅器的快速FH / MFSK系统的改进多用户检测器

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摘要

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 E_b/N_0=25 dB.
机译:本文提出了一种改进的迭代干扰消除(IIC)多用户检测方案,以减少快速跳频/多级频移键控(FH / MFSK)系统中的多址干扰(MAI)。所提出的检波器在IIC检波器中采用了与软限幅器相结合的分集,仿真结果表明,在频率选择性衰落信道中,所提出的检波器的性能可以得到显着改善。对于频率为M = 128,分集阶数L = 7,用户数K = 30至80,以及平均比特能量噪声密度比E_b / N_0 = 25 dB。

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