Abstract
Two-way relaying is a promising technique to improve the spectral efficiency of wireless communications, where a relay or a set of relays are used to realize information exchange between two sources at the same time and frequency. For long distance transmission, two-way relaying needs to be further combined with a multihop routing mechanism for efficient information exchange. In this thesis, we propose a new cooperative multihop transmission scheme for two-way decode-and-forward relay networks, in which multiple single-antenna relays are considered and distributed between two sources. The proposed scheme mainly consists of a forwarder selection part and a relay selection part; the former aims to minimize the number of transmission hops, and the latter is used to improve the reliability of communication links. We obtain the coverage regions of available relays and forwarders based on an asymptotic symbol error probability (SEP) analysis, and then combine the results with geographic information for minimum-SEP relay selection and maximum-coverage forwarder selection. It is shown that the proposed approach provides better effective throughput performance than a related method. In addition, an asymptotic overall end-to-end SEP for the proposed scheme is derived with a closed-form expression. Simulation results are given to validate the analyses as well as to demonstrate the effectiveness of the proposed approach.