DocumentCode :
2170671
Title :
Unequal error protection with eigen beamforming for partial channel information MIMO-OFDM
Author :
Hassan, Khaled ; Henkel, Werner
Author_Institution :
Sch. of Eng. & Sci., Int. Univ. Bremen, Bremen
fYear :
2007
fDate :
April 30 2007-May 2 2007
Firstpage :
1
Lastpage :
5
Abstract :
Some communication applications, like multimedia, deliver data of different importance classes allowing unequal error protection (UEP) levels. In this paper, a multiple-input multiple-output (MIMO) system using orthogonal frequency division multiplexing (OFDM) is considered with a new UEP bit-loading algorithm based on the non-UEP algorithm by Chow, Cioffi, and Bingham. In the proposed bit-loading algorithm, bits are distributed across the unitarily transformed eigenbeams in case of partial channel information (CSI) knowledge. However, ideal performance can not withstand the rapid wireless channel variation unless a restricted beamforming is used. For the case of partial CSI, we proposed a switched beamforming technique that can maintain the required performance protection levels.
Keywords :
MIMO communication; OFDM modulation; eigenvalues and eigenfunctions; wireless channels; MIMO-OFDM; bit-loading algorithm; eigen beamforming; eigenbeams; multiple-input multiple-output system; orthogonal frequency division multiplexing; partial channel information; unequal error protection; wireless channel; Array signal processing; Error correction codes; Feedback; Gaussian noise; Interference; MIMO; Multimedia communication; OFDM; Signal to noise ratio; Transmitters;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Sarnoff Symposium, 2007 IEEE
Conference_Location :
Nassau Inn, Princeton, NJ
Print_ISBN :
978-1-4244-2483-2
Type :
conf
DOI :
10.1109/SARNOF.2007.4567315
Filename :
4567315
Link To Document :
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