Near-Capacity FEC Codes For MIMO Non-Regenerative Wireless Relay System

Visiting researcher: Dr Soon Xin Ng (University of Southampton)
Host researcher: Dr Wei Liu (XDU)
Duration: 2 weeks
Status: Completed

Biography of the visiting researcher

Dr Soon Xin Ng (S’99-M’03-SM’08) received the B.Eng. degree (First class) in electronics engineering and the Ph.D. degree in wireless communications from the University of Southampton, Southampton, U.K., in 1999 and 2002, respectively. From 2003 to 2006, he was a postdoctoral research fellow working on collaborative European research projects known as SCOUT, NEWCOM and PHOENIX. Since August 2006, he has been a lecturer in wireless communications at the University of Southampton. He has been part of a team working on the OPTIMIX European project since March 2008.
His research interests are mainly in adaptive coded modulation, channel coding, space-time coding, joint source and channel coding, OFDM, MIMO, cooperative communications and distributed coding. He has published numerous papers and coauthored a book in this field.

Background and Motivation

It is widely recognized that multiple input multiple output (MIMO) systems are capable of supporting high-rate, high-integrity transmissions. Hence, multiple-antenna-relay (MAR) assisted transmission techniques have been intensively investigated. The performance of an amplified-and-forward (AF) wireless relay system can be significantly improved by jointly optimizing the transceivers at base station (BS), relay station (RS) and mobile station (MS). More explicitly, a powerful linear minimum mean square error (MMSE) based MAR-aided joint transceiver design was proposed for a two-hop MIMO relay system. An optimal linear weighting matrix at RS was also proposed for maximizing the achievable system capacity.
The current research works on MIMO non-regenerative wireless relay have identified the associated Continuous-Input Continuous-Output Memoryless Channel (CCMC) capacity. However, the more meaningful modulation-dependent Discrete-Input Continuous-Output Memoryless Channel (DCMC) capacity has not been identified.
The aim of the proposed research is to design powerful FEC codes to approach the DCMC capacity of the MIMO non-regenerative wireless relay system. We aim to conduct detailed technical investigations on quantifying the achievable power reduction of the proposed solution and disseminate the results in a journal.

Research Activities

The research programme was based on the following steps:
  1. The first step in achieving the aim is to derive the DCMC capacity of the MIMO Non-Regenerative Wireless Relay system.
  2. Then, the EXIT chart analysis will be used to compute the maximal achievable rate based on the area under the inner EXIT curve.
  3. Based on the inner EXIT curve, we will design an FEC code for employment as the outer code.
  4. Another EXIT chart analysis will be carried out to compute the outer EXIT curve and the overall decoding trajectory.
  5. Monte-Carlo simulation of the whole system will be carried out in order to verify the design.
  6. A journal paper will be written based on the above research.


A journal letter was written.
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