Software Radio-Based Distributed Multi-User MIMO Testbed: Towards Green Wireless Communications

Hidekazu MURATA  Susumu YOSHIDA  Koji YAMAMOTO  Daisuke UMEHARA  Satoshi DENNO  Masahiro MORIKURA  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E96-A    No.1    pp.247-254
Publication Date: 2013/01/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E96.A.247
Print ISSN: 0916-8508
Type of Manuscript: Special Section INVITED PAPER (Special Section on Wideband Systems)
green wireless,  multi-user MIMO,  software radio,  distributed antenna system,  field experiment,  

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The present paper introduces a prototype design and experimental results for a multi-user MIMO linear precoding system. A base station and two mobile stations are implemented by taking full advantage of the software-defined radio. The base station consists of general purpose signal analyzers and signal generators controlled by a personal computer. Universal software radio peripherals are used as mobile stations. Linear spatial precoding and a simple two-way channel estimation technique are adopted in this experimental system. In-lab and field transmission experiments are carried out, and the bit error rate performance is evaluated. The impact of the channel estimation error under average channel gain discrepancy between two mobile stations is analyzed through computer simulations. Channel estimation error is shown to have a greater influence on the mobile station with the greater average channel gain.