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This paper proposes a fast and reliable technique for timing and frequency synchronization of multiple-input multiple- output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. The synchronization is achieved using one chu sequence-based preamble which is simultaneously transmitted from all transmit antennas in the same OFDM time instant. From analysis, the chu sequence-based preamble...
MIMO system has been proven to provide more capacity than conventional SISO system, which is linear increase with the number of minimum transmit and receive antennas. But it is true only in independent conditions, when the spatial fading correlation exists, the capacity may be different. Linear precoder and decoder enable optimal allocation of power and bits over the spatial and temporal domain, depend...
The spatial and temporal correlation is investigated at both transmitter and receiver. A cluster-based double bounce MIMO channel model is presented. The model can be used for nonselective Rice fading MIMO channels, and the expressions for correlation coefficient and channel capacity are derived. The correlation coefficient is the function of antennas spacing, angular spread, power angular spectrum,...
Multiuser downlink beamforming methods have been studied recently. As known, the MIMO broadcast channel capacity can be achieved by dirty paper coding (DPC). However, the high complexity of DPC is hard to implement. Linear zero-forcing beamforming strategy can achieve the same asymptotic sum-rate as that of DPC, when the number of users goes to infinity. For the linear zero-forcing system, (D. Bartolome...
CDMA system combined with multiple antennas is very promising in the B3G and 4G wireless communication because its high spectral efficiency. Multiple antennas in CDMA system always perform on two sides: providing diversity gain or spatial multiplexing, which lead to the tradeoff between system BER performance and its capacity. In this paper, a new multiple antenna transmission scheme which not only...
In this paper, list detection based on lattice reduction (LDLR) in MIMO systems is proposed. By generating a list of candidate transmit symbol vectors we can improve the performance of linear detection based on lattice reduction and successive interference cancellation based on lattice reduction significantly. The performance improvement is demonstrated by computer simulations, which also show that...
Iterative list sphere decoding (LSD) can achieve near capacity on a multiple-antenna channel, however, with a rather high complexity. In order to reduce the complexity, in this paper, linear detection-based iterative soft interference cancellation (ISIC) instead of LSD is applied at the second and later iterations. We propose to exploit extrinsic information transfer (EXIT) chart analysis to select...
MIMO systems can offer high multiplexing and diversity gain, but the increased complexity hampers the practical applications. Through antenna selection, the complexity and cost can be greatly reduced while the gain of MIMO systems can be reserved. In this paper, a fast sub-optimal antenna selection algorithm based on norm and correlation is proposed for maximizing the channel capacity. Compared with...
In this paper, a novel MIMO detection named decision feedback aided detection based on lattice reduction (DFDLR) is proposed. Lattice reduction has been proposed to be exploited in signal detection in multiple antenna systems. However, lattice reduction transforms the QAM constellation cube to be a parallelotope, and it is difficult to determine the transformed QAM boundaries, which results in sub-optimal...
Notice of Violation of IEEE Publication Principles"A Novel Optimization Method of Transceivers in Multiuser MIMO Wireless System" by Z. Yu and W. Wu,in Proceedings of the 2005 Second IEEE Consumer Communications and Networking Conference, pp. 590-594 After careful and considered review of the content and authorship of this paper by a duly constituted expert committee, this paper has been...
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