Delay constrained throughput optimization in multi-hop AF relay networks, using limited quantized CSI

作     者：Taki, Mehrdad Svensson, Tommy Nezafati, Mohammad Bagher 

作者机构：Univ Qom Dept Elect Engn Qom Iran Chalmers Univ Technol Dept Signals & Syst Gothenburg Sweden Inst Res Fundamental Sci Tehran Iran 

出 版 物：《EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING》 (EURASIP无线通信与网络杂志)

年 卷 期：2019年第2019卷第1期

页      面：1页

核心收录：

学科分类：0810[工学-信息与通信工程] 0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 

基　　金：The authors declare that there is no funding for this work. Data sharing is not applicable to this article as no datasets were generated or analyzed during the current study 

主　　题：Multi-hop relay Amplify and forward relaying Discrete link adaptation Adaptive modulation and coding Delay-QoS constraint 

摘      要：In this paper, we analyze the throughput of multi-hop amplify and forward (AF) relay networks in delay-constrained scenario. Using quantized channel state information (CSI), the transmission rates and powers are discretely adapted with individual average power constraint on each node. A sub-gradient projection-based algorithm is utilized, by which there is no need for probability density functions (PDFs) to solve the optimization problem. Our numerical evaluations show that the sub-gradient projection-based algorithm results in a comparable performance with an analytical approach using PDFs. As shown, a considerably better performance obtained by the designed scheme compared to previous schemes with constant power transmission. More than 70% throughput improvement is achieved by our scheme compared to constant power transmission with just two more feedback bits and a short training time required at the beginning of the transmission.