Non-Coherent Demapping for Stationary Rayleigh Fading Channels using Semidefinite Programming


S. Corroy, M. Dörpinghaus, R. Mathar,


        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 pilot based detection, while saving bandwidth and transmit power.

BibTEX Reference Entry 

	author = {Steven Corroy and Meik D{\"o}rpinghaus and Rudolf Mathar},
	title = "Non-Coherent Demapping for Stationary {R}ayleigh Fading Channels using Semidefinite Programming",
	pages = "686-690",
	booktitle = "The Tenth International Symposium on Wireless Communication Systems (ISWCS 2013",
	address = {Ilmenau, Germany},
	month = Aug,
	year = 2013,
	hsb = hsb999910311769,


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