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ABSTRACT: Multiple-Input-Multiple-Output (MIMO) systems have appeared as a promising solution to provide high speed wireless services in extreme hostile environment. This paper deals with the performance analysis of Multiple Input Multiple Output (MIMO) system in non-uniform phase distributed Nakagami-m channel with zero forcing (ZF) receiver. The effect of Doppler shift and Nakagami-m fading parameter m on the channel ergodic and outage capacity have been analyzed here.
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1 INTRODUCTION
To fulfil the demand of future generation wireless communication systems, MIMO systems have been recognized as one of the key and foremost technology. Starting from the research work by Foschini et al. [Gu et al 2006], lots of work have been done and also going on throughout the world to explore the capability of MIMO system in a better and sophisticated way.
With the growing demand of data seeking application under the spectral limitation and rich scattering environment, MIMO systems offer the possibility of spatial diversity which enables very high spectral efficiencies [Foschini 1996, Winters 1987 and Vucetic et al. 2003]. This features of MIMO encourage the researchers to the development of advanced signal processing architecture to support new age user demand. Vertical Bell laboratories Layered space-Time (V-BLAST) [Foschini 1996, Jiang et al. 2005, and Foschini 1998] is a MIMO architecture known to have high spectral efficiencies at average SNR without coding [Wolniansky et al. 1998].
Linear receivers like Zero-Forcing (ZF) which provide sub-optimal performance but offer significant computational complexity reduction with tolerable performance degradation. But these receiver required accurate Channel State Information (CSI) for its proper operation. In paper authors investigate the performance of MIMO ZF receivers in non-uniform phased distributed Nakagami-m channel.
A great deal of research has been carried out to the study of the ergodic capacity of MIMO channels under various environments, e.g., [Shin et al. 2003, Shin et al. 2008, Chiani et al. 2003, Shin et al. 2006, Oyman et al. 2003 and Kang et al. 2006]. In [Shin et al. 2003], the asymptotic performance of MIMO systems in Rayleigh-fading channels was investigated. Though Rayleigh and Rician are popular and commonly used statistical models for fading. But a more versatile model that correspond to variety of physical environments is the Nakagami fading model [Nakagami 1960, Zhong...