Incremental Relaying Based on Error-Rate Utility Function

• Main Authors: Hou-Cheng Shih, 施厚成
• Other Authors: Yin-Man Lee
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/64437196704941571273

碩士 === 國立暨南國際大學 === 電機工程學系 === 104 === In wireless communications, the application of various cooperation techniques can offer additional spatial diversity. It can be shown that the corresponding error-rate performance can be much improved under the fading channel environment. However, in order to achieve this enhancement, traditional cooperation techniques usually use all active relay branches for transmission, which may reduce the spectral efficiency. Incremental relaying (IR) has been proposed recently to increase spectral-efficiency through reducing the relay-forwarding action. A signal-to-noise ratio (SNR) threshold value is included at the destination which helps to determine whether the relay is needed to forward the overheard signals. In this thesis, we propose a new IR method based on instantaneous error-rate and Amplify-and-Forward (AF) protocol for M-ary Quadrature Amplitude Modulation (M-QAM) and M-ary Phase Shift Keying (M-PSK) signals. We compare both the error-rate performance and relay usage of our proposed IR method and the previous SNR-based IR method. Simulation results show that the proposed method has better relay usage as compared with the conventional one for both QPSK and 16-AQM signals under a similar error rate.