PSO-Based NBI Resistant Asynchronous MCCDMA Multiuser Detector

Abstract

Abstract-Nowadays with the increase of demand in mu ltimed ia co mmunicat ion, a reliable and error-free wireless communication system is the need of the hour. MC-CDMA is being investigated as a potential radio technology to provide fourth generation (4G) and fifth generation (5G) cellular mobile services. Narrowband interference (NBI) signals corrupts the subcarriers of MC-CDMA system and as a result its performance degrades. All the availab le NBI elimination methods uses some kind of filters and other circuitry prior to the demodulator (receiver) to filter out NBI. So addit ion of extra hardware to the system makes the system co mplex and slow. Moreover CDMA based systems are affected by digital NBI which gets superimposed with wideband spread spectrum signal. Multiuser detection could be an efficient technique to suppress NBI and mult iple access interference (MAI). Co mputational co mplexity of optimu m mu ltiuser detector is an impediment in the way of an efficient mu ltiuser detector. In this paper we propose a particle swarm optimization (PSO) based optimu m mu ltiuser detector to eliminate NBI. Simu lation results show that performance of proposed PSO based mult iuser detector is capable of eliminating NBI with much lesser amount of computational complexity.

Potential interference immunity of coherent reception of quadruple phase-manipulated radio signal in the presence of coherent harmonic interference

“…Определение помехоустойчивости приема радиосигнала с наиболее применяемыми видами манипуляции при наличии помех различного характера является одной из основных задач в теории и практике передачи дискретных сообщений в инфокоммуникационных радиосистемах, особенно для фазоманипулированных полосноэффективных сигналов [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Формализация постановки задачи и методы ее решения могут существенно отличаться в зависимости от принятого алгоритма обработки сигнала и структуры системы модулятор-демодулятор.…”