Joint Power Assignment and Relay Location Design in Cooperative Power-Efficient Two-hop Networks with Partial Channel Information

• Main Authors: Hao-Wen Luo, 羅浩文
• Other Authors: Jane-Hwa Huang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/21688457704575795957

碩士 === 國立暨南國際大學 === 電機工程學系 === 101 === With shorter transmission distances, cooperative communication is a cost-efficient so- lution to save power. However, to design a high-capacity power-efficient cooperative network, we should consider the tradeoff between power saving and user throughput. Specifically, although lowering the transmission power can save power, it may degrade user throughput. Relay location is also an important design issue in the cooperative net- works since the required transmission power of base station and relay stations strongly depends on the relay location. In this thesis, to achieve the tradeoff between power saving and throughput, we apply an optimization approach to jointly design the relay location and the power levels for base stations/relay stations. Furthermore, in this co- operative network, each user can select one transmission mode among direct, relay, or cooperative transmission modes to communicate with the base station. We compare two transmission-mode (TX-mode) selection principles including throughput-oriented (TO) and signal strength-oriented (SSO) selection principles. In these TX-mode selection principles, one user can select his/her suitable transmission mode and modulation-and- coding scheme (MCS) based on average signal-to-noise ratio. The users only learn the partial channel information. To avoid signal quality corrupted due to deep fading, we incorporate the fading margin mechanism in the rate adaption method, so as to improve the link reliability. Numerical results show that Throughput-oriented selection princi- ple can yield higher throughput and power efficiency than the Signal strength-oriented selection principle. By properly design of appropriate fading margin, the relay station location and transmission power ,both the goals of power saving and throughput guar- antee can be fulfilled in the power efficiency cooperative networks.