DocumentCode :
2771032
Title :
PAPR Reduction Method for Block Diagonalization in Multiuser MIMO-OFDM Systems
Author :
Umeda, Shusaku ; Suyama, Satoshi ; Suzuki, Hiroshi ; Fukawa, Kazuhiko
Author_Institution :
Tokyo Inst. of Technol., Tokyo, Japan
fYear :
2010
fDate :
16-19 May 2010
Firstpage :
1
Lastpage :
5
Abstract :
This paper proposes a peak-to-average power ratio (PAPR) reduction method that maintains an effect of linear precoding by block diagonalization (BD) for multiuser (MU) MIMO-OFDM systems. In the downlink MU-MIMO-OFDM, BD orthogonalizes multiple signals of all users by the linear precoding using channel state information, but the transmitted signal still has high PAPR due to OFDM characteristics. Therefore, BD suffers from waveform distortion caused by a nonlinear transmit power amplifier, especially when the number of transmit antennas is set large enough for the orthogonalization. This paper proposes BD transmission selected mapping (BD-SLM) that can reduce PAPR while maintaining the BD effect. BD-SLM performs the phase shift to modulation signals of all users before the linear precoding. From several phase sequences, it selects a phase sequence that minimizes the peak of the time-domain signals at all transmit antennas. Computer simulations demonstrate that BD-SLM can drastically reduce PAPR in 16 × 4 MIMO-OFDM with four users, and that it can alleviate the performance degradation even when the power amplifier causes nonlinear distortion.
Keywords :
MIMO communication; OFDM modulation; linear codes; mobile radio; nonlinear distortion; power amplifiers; precoding; BD transmission selected mapping; BD-SLM; PAPR reduction method; block diagonalization; linear precoding; multiuser MIMO-OFDM system; nonlinear transmit power amplifier; peak-to-average power ratio; waveform distortion; Channel state information; Computer simulation; Downlink; Nonlinear distortion; OFDM; Peak to average power ratio; Phase modulation; Power amplifiers; Time domain analysis; Transmitting antennas;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference (VTC 2010-Spring), 2010 IEEE 71st
Conference_Location :
Taipei
ISSN :
1550-2252
Print_ISBN :
978-1-4244-2518-1
Electronic_ISBN :
1550-2252
Type :
conf
DOI :
10.1109/VETECS.2010.5493834
Filename :
5493834
Link To Document :
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