DocumentCode :
163137
Title :
Analysis of Channel Non-Reciprocity Due to Transceiver and Antenna Coupling Mismatches in TDD Precoded Multi-User MIMO-OFDM Downlink
Author :
Yaning Zou ; Raeesi, Orod ; Wichman, Risto ; Tolli, Antti ; Valkama, Mikko
Author_Institution :
Dept. of Electron. & Commun. Eng., Tampere Univ. of Technol., Tampere, Finland
fYear :
2014
fDate :
14-17 Sept. 2014
Firstpage :
1
Lastpage :
7
Abstract :
This paper studies the impact of two implementation imperfections, namely, transceiver frequency-response non-reciprocity and antenna mutual coupling mismatches at the base-station and user equipment on the channel reciprocity assumption in TDD systems. Comprehensive signal models are first developed to analyze the joint effects of these two imperfections in the TDD multi-user MIMO-OFDM downlink transmission system context, covering both zero-forcing (ZF) and eigenbeamforming based transmitter processing. The corresponding performance degradation is then evaluated in terms of SINRs and maximum achievable sum-rate. The analysis shows that during downlink transmission, the transceiver non-reciprocity and antenna mutual coupling mismatches at the base-station introduce inter-user interference (IUI) and are the major causes for the resulting performance degradation. Implementation imperfections at user equipment side, in turn, only introduce inter-stream interference (ISI) that can be fairly easily suppressed in detector processing as part of effective precoded channels. In order to achieve throughputs close to the ideal case, transceiver frequency-response mismatches and antenna mutual coupling at the base-station side need to be extremely well calibrated, generally below 35-40dB in terms of relative mismatch levels.
Keywords :
MIMO communication; OFDM modulation; antenna theory; array signal processing; channel coding; frequency response; radio transceivers; radiofrequency interference; time division multiplexing; wireless channels; ISI; IUI; SINR; TDD multiuser MIMO-OFDM downlink transmission system context; antenna mutual coupling mismatches; channel reciprocity assumption; downlink transmission; eigenbeamforming based transmitter processing; implementation imperfections; inter-stream interference; inter-user interference; pre-coded channels; transceiver frequency-response nonreciprocity; user equipment; zero-forcing coverage; Downlink; Interference; Mutual coupling; Receivers; Transceivers; Transmitting antennas;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference (VTC Fall), 2014 IEEE 80th
Conference_Location :
Vancouver, BC
Type :
conf
DOI :
10.1109/VTCFall.2014.6965875
Filename :
6965875
Link To Document :
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