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Design and Performance Analysis for LDPC Coded Modulation in Multiuser MIMO Systems

Wu, Jianming (2006) Design and Performance Analysis for LDPC Coded Modulation in Multiuser MIMO Systems. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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The channel capacity can be greatly increased by using multiple transmit and receive antennas, which is usually called multi-input multi-output (MIMO) systems. Iterative processing has achieved near-capacity on a single-antenna Gaussian or Rayleigh fading channel. How to use the iterative technique to exploit the capacity potential in single-user and/or multiuser MIMO systems is of great interest. We propose a low-density parity-check (LDPC) coded modulation scheme in multiuser MIMO systems. The receiver can be regarded as a serially concatenated iterative detection and decoding scheme, where the LDPC decoder performs the role of outer decoder and the multiuser demapper does that of the inner decoder. For the proposed scheme, appropriate selection of a bit-to-symbol mapping is crucial to achieve a good performance, so we investigate and find the best mapping under various cases.Analytical bound serves as a useful tool to assess system performance. The search for powerful codes has motivated the introduction of efficient bounding techniques tailored to some ensembles of codes. We then investigate combinatorial union bounding techniques for fast fading multiuser MIMO systems. The union upper bound on maximum likelihood (ML) decoding error probability provides a prediction for the system performance, with which the simulated system performance can be compared. Closed-form expression for the union bound is obtained, which can be evaluated efficiently by using a polynomial expansion. In addition, the constrained channel capacity and the threshold obtained from extrinsic information transfer (EXIT) chart can also serve as performance measures. Based on the analysis for fast fading case, we generalize the union upper bound to the block fading case.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairLee,
Committee MemberLi, Ching-Chungccl@engr.pitt.eduCCL
Committee MemberBoston, J. Robertboston@engr.pitt.eduBBN
Committee MemberSimaan, Marwan Asimaan@engr.pitt.eduSIMAAN
Committee MemberJacobs, Steven Pspj1@pitt.eduSPJ1
Committee MemberChen,
Date: 27 September 2006
Date Type: Completion
Defense Date: 10 July 2006
Approval Date: 27 September 2006
Submission Date: 24 July 2006
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Electrical Engineering
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: constrained capacity; iterative demapping and decoding; LDPC coded modulation; MIMO; multiuser system; union upper bound
Other ID:, etd-07242006-075022
Date Deposited: 10 Nov 2011 19:53
Last Modified: 15 Nov 2016 13:46


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