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This paper proposes practical coordinated linear transmit-receive processing schemes for the uplink (UL) of multiuser multiple-input multiple-output (MIMO) systems in the time division duplex (TDD) mode. The base station (BS) computes the transmission parameters in a centralized manner and employs downlink (DL) pilot signals to convey the information of the beam selection and beamformers to be used by the terminals. When coexisting with the DL transmit-receive zero forcing, the precoded DL demodulation pilots can be reused for UL beam allocation so that no additional pilot overhead is required. Furthermore, the locally available channel state information (CSI) of the effective MIMO channel is sufficient for the terminals to perform transmit power and rate allocation independently. In order to reduce the UL pilot overhead as well, we propose reusing the precoded UL demodulation pilots in turn for partial CSI sounding. The achievable sum rate of the system is evaluated in time-varying fading channels and with channel estimation. According to the results, the proposed UL transmission strategy provides increased rates compared to single-user MIMO transmission combined with user selection as well as to UL antenna selection transmission, without being sensitive to CSI uncertainty.
IST-4-027756 WINNER II : D3.4.1 The WINNER II air interface: refined spatial-temporal processing solutions. October 2006
Peel CB, Hochwald BM, Swindlehurst AL: A vector-perturbation technique for near-capacity multiantenna multiuser communication—part I: channel inversion and regularization. IEEE Transactions on Communications 2005, 53(1):195-202. 10.1109/TCOMM.2004.840638 CrossRef
Wong K-K, Murch RD, Letaief KB: A joint-channel diagonalization for multiuser MIMO antenna systems. IEEE Transactions on Wireless Communications 2003, 2(4):773-786. CrossRef
Farhang-Boroujeny B, Spencer Q, Swindlehurst L: Layering techniques for space-time communication in multi-user networks. Proceedings of the IEEE Vehicular Technology Conference (VTC '03), October 2003, Orlando, Fla, USA 2: 1339-1343.
Tölli A, Codreanu M, Juntti M: Cooperative MIMO-OFDM cellular system with soft handover between distributed base station antennas. IEEE Transactions on Wireless Communications 2008, 7(4):1428-1440. CrossRef
Chae C-B, Mazzarese D, Jindal N, Heath RW Jr.: Coordinated beamforming with limited feedback in the MIMO broadcast channel. IEEE Journal on Selected Areas in Communications 2008, 26(8):1505-1515. CrossRef
Chae C-B, Kim S, Heath RW Jr.: Linear network coordinated beamforming for cell-boundary users. Proceedings of IEEE Workshop on Signal Processing Advances in Wireless Communications, June 2009, Perugia, Italy 534-538.
Tölli A, Juntti M: Scheduling for multiuser MIMO downlink with linear processing. Proceedings of IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, September 2005, Berlin, Germany 1: 156-160.
Boccardi F, Huang H: A near-optimum technique using linear precoding for the MIMO broadcast channel. Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP '07), April 2007, Honolulu, Hawaii, USA 3: 17-20.
Lebrun G, Gao J, Faulkner M: MIMO transmission over a time-varying channel using SVD. IEEE Transactions on Wireless Communications 2005, 4(2):757-764. CrossRef
Zhang K, Niu Z: MIMO broadcast transmission with outdated channel state information. Proceedings of Asia-Pacific Conference on Communications (APCC '06), August 2006, Buson, Korea 1-5.
Samardzija D, Mandayam N: Impact of pilot design on achievable data rates in multiple antenna multiuser TDD systems. IEEE Journal on Selected Areas in Communications 2007, 25(7):1370-1379. CrossRef
Komulainen P, Latva-Aho M, Juntti M: Block diagonalization for multiuser MIMO TDD downlink and uplink in time-varying channel. Proceedings of International ITG Workshop on Smart Antennas, February 2008, Darmstadt, Germany 74-81.
- Downlink Assisted Uplink Zero Forcing for TDD Multiuser MIMO Systems
- Springer International Publishing
- EURASIP Journal on Wireless Communications and Networking
Elektronische ISSN: 1687-1499
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