Spectral Efficiency of Maximum Ratio Combining: Slow Fading
نویسندگان
چکیده
In this paper we derive closed-form expressions for the single-user capacity of Maximum Ratio Combiner (MRC) system system, taking into account the effect of imperfect channel estimation at the receiver. The channel considered is a slowly varying spatially independent flat Rayleigh fading channel. The complex channel estimate and the actual channel are modelled as jointly Gaussian random variables with a correlation that depends on the estimation quality. Two adaptive transmission schemes are analyzed: 1) optimal power and rate adaptation; and 2) constant power with optimal rate adaptation. Our numerical results show the effect of Gaussian channel estimation error on the achievable spectral efficiency.
منابع مشابه
Optimal Power and Modulation Adaptation Policies with Receiver Diversity over Rayleigh Fading Channel
Efficient bandwidth utilization is paramount in wireless communication systems, particulary in fading environments, since fading is one of the major constraints that impair communication in wireless systems. The bandwidth efficiency of a wireless communication system can be enhanced significantly by employing power and modulation adaptation policies with diversity combining gain. In this work, ...
متن کاملSpectral efficiency for selection combining RAKE receivers over Weibull fading channels
Novel closed-form expressions for the probability density function and the average output signal-to-noise ratio at the output of a selection combiner in Weibull fading are derived. Using these expressions, the spectral efficiency of a direct sequence code division multiple access system is analytically obtained and performance evaluation results are presented. r 2004 The Franklin Institute. Pub...
متن کاملA Blind Hammerstein Diversity Combining Technique for Flat Fading Channels
Diversity combining techniques play an important role in combating the destructive effects of channel fading in wireless communication systems. In this work we present a blind diversity combining technique for Rayleigh flat fading channels based on Hammerstein type filters. We show that the performance of this technique is very close to ideal MRC system which is accepted as an optimum receiver ...
متن کاملPerformance Analysis for DAF Cooperative Communication with different combining and modulation techniques
Cooperative communication has been proposed in order to increase the reliability and the quality of service (QoS), coverage area range, and the data throughputs as well as improve the spectral efficiency of the wireless networks while prolonging the life of the nodes or user terminals by increasing energy efficiency. In this paper an Ad-hoc network consisting of a source, a destination and a th...
متن کاملAdaptive coded modulation in spatial and multiuser diversity systems
This thesis consists of five included papers plus an introduction. The majority of the papers are devoted to performance analysis of an adaptive coded modulation (ACM) scheme based on multidimensional trellis codes. Primarily, single-user systems exploiting spatial diversity are analysed, but results are also presented for a multiuser system exploiting multiuser diversity. The performance of th...
متن کامل