Non-Coherent Demapping for Stationary Rayleigh Fading Channels using Semidefinite Programming
Conference: ISWCS 2013 - The Tenth International Symposium on Wireless Communication Systems
08/27/2013 - 08/30/2013 at Ilmenau, Deutschland
Proceedings: ISWCS 2013
Pages: 5Language: englishTyp: PDF
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Authors:
Corroy, Steven; Mathar, Rudolf (Institute for Theoretical Information Technology, RWTH Aachen University, Aachen, Germany)
Doerpinghaus, Meik (Vodafone Chair Mobile Communications Systems, Technische Universität Dresden, Dresden, Germany)
Abstract:
In this paper, we consider the problem of detecting a QPSK signal transmitted over a flat-fading channel without using pilot symbols. Instead, our aim is to approximate ML sequence detection, which is a nonconvex and discrete problem. To solve this problem, we use semidefinite relaxation and randomization to find a solution close to optimal. We propose a new solver based on the alternative direction method of multipliers to solve this problem efficiently. To verify this approach, we have developed and implemented a complete communication framework. We thoroughly simulated the conventional scheme using pilot-based channel estimation, as well as our newly proposed method and compared the achieved bit error rates. For high channel dynamics, our approach outperforms the pilo