On The Study Of Cell Coverage Area For Wireless Relay Networks

In the past two decades, wireless communications technologies have seen a remarkably fast development. Cooperative communications and networking is a new communication technology paradigm that allows distributed terminals in a wireless network to collaborate through some distributed transmission or signal processing so as to realize a new form of space diversity to combat the detrimental effects of fading channels. Such a new viewpoint has brought various new communication techniques that improve communication capacity, speed, and performance; reduce battery consumption and extend network lifetime; increase the throughput and expand the transmission coverage area.Although there has been a growing interest on cooperative diversity, the current literatures are mainly limited to the results obtained for Rayleigh, Rician, or Nakagami fading channels. Few researchers quantitatively analyze the subject of wireless relay network coverage area over path loss and shadow fading model. In this thesis, we investigate the issue of cell coverage for wireless relay cellular network, and to make up for the lack of research on relay cell coverage at home and abroad.First of all, we focus on the cell coverage problem for single-relay cooperative networks with path loss and the hybrid model. Under a predetermined threshold condition, we solve the second kind modified Bessel which contains an unknown by using famililar mathematical software such as Matlab and derive cell coverage radius of the corresponding link, and analyze the different parameters how to impact upon the relay cell coverage radius. To investigate the hybrid model, and taking into account the special nature of the shadow fading term, we have obtained the relationship between the system outage probability and shadow fading standard deviation through the Monte Carlo simulation method. According to our analysis, relay cellular coverage area approximately 2.25 to 4 times large than traditional cellular networks. We also use asymptotic analysis to prove the correctness of the results of our analysis.Secondly, to further investigate the issue of the relay cellular coverage area for multiuser diversity system over path loss model and the hybrid model. Under the same conditions, the multi-user relay cell based on path loss model than the single-user coverage area increased by about 4 to 9 times, while the hybrid model based on the case of cell coverage radius of the shadow fading effect will be decreased. Relay cell coverage research provide a theoretical basis for the engineering design and future cellular mobile communication system, has important practical significance.