DocumentCode :
2329054
Title :
MMSE Modified Multi-User MIMO Downlink Transmission with Imperfect CSI
Author :
Chang, Pengfei ; Lv, Tiejun ; Wang, Taotao ; Gao, Hui ; Li, Yonghua
Author_Institution :
Sch. of Inf. & Commun. Eng., Beijing Univ. of Posts & Telecommun. (BUPT), Beijing, China
fYear :
2011
fDate :
15-18 May 2011
Firstpage :
1
Lastpage :
5
Abstract :
By introducing the leakage concept, the maximum signal-to-leakage-and-noise ratio (SLNR) scheme has been served as a candidate precoding scheme in the advanced long term evolution (LTE-Advanced) communication system. However, the original scheme allocates every user the same transmit power and takes the matched filter to decode the receive signals, which results in the limited bit error rate (BER) performance. With the antenna correlation at BS and the channel estimation error for every user, we design a modified matrix by minimizing the system Mean Square Error (MMSE) after maximizing the SLNR under the total transmit power constraint. At each user, a linear decoder is calculated based on the MMSE criteria in the presence of imperfect channel state information (ICSI). Due to the dynamic power allocation during the parallel data streams and the linear MMSE (LMMSE) receiver, the proposed scheme can mitigate the residual interference induced by ICSI and improve the system BER performance efficiently.
Keywords :
Long Term Evolution; MIMO communication; channel estimation; decoding; error statistics; interference suppression; least mean squares methods; precoding; radio links; radio receivers; advanced long term evolution-advanced communication system; antenna correlation; bit error rate; channel estimation error; imperfect channel state information; leakage concept; linear MMSE receiver; linear decoder; maximum signal-to-leakage-and-noise ratio scheme; minimum mean square error; multiuser MIMO downlink transmission; precoding scheme; receive signal decoding; residual interference mitigation; Bit error rate; Channel estimation; Downlink; Interference; MIMO; Receiving antennas;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference (VTC Spring), 2011 IEEE 73rd
Conference_Location :
Budapest
ISSN :
1550-2252
Print_ISBN :
978-1-4244-8332-7
Type :
conf
DOI :
10.1109/VETECS.2011.5956259
Filename :
5956259
Link To Document :
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