Enhancing The Performance Of Relay-Based Cellular
The concept of relaying is a promising solution for the challenging throughput and high data rate coverage requirements of future wireless cellular networks. In this thesis I demonstrate that throughput and high data rate coverage can be enhanced significantly in such networks through the use of digital fixed relays. Additionally, resource (frequency resource and time resource) allocation, relay selection schemes and routing strategies are further investigated based on this cellular relaying network.
In the cellular relaying networks, more (mobile station) MSs can be served as the number of (relay station) RSs increases, more (mobile station) MSs can be served by RS. However, the interference is also increased at the same time. Optimal threshold value algorithm is studied for the relay selection process to achieve the maximum cell throughput. Whenever a relay is used, co-channel interference will be happened between different RSs using the same frequency band. In order to avoid this co-channel interference, different frequency band is allocated to the different RSs, especially for the neighboring RSs. Although the interference has been intimidated, the throughput has been decreased as a tradeoff. I propose an adaptive time resource allocation scheme base on the relay node division duplex (RNDD) relay approach in which neighboring RSs are allocated to the different time slots, in order to prevent the co-channel interference from neighboring RS within same frequency band increasing to unacceptable levels without immolating the frequency band. At last, two routing strategies namely, symmetric and asymmetric, for two-hop relaying networks with fixed relay nodes are discussed in terms of cell throughput and MS’s power consumption.
I investigate the performance of the proposed algorithms, including optimal threshold, adaptive time allocation and asymmetric routing strategies. I observe that maximum throughput value could be achieved under certain signal...
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