%0 Journal Article
%T Low-Complexity LDPC-Coded USTM Noncohereny MIMO Receivers
%A Li Peng
%A Lingling Yang
%J Open Access Library Journal
%V 1
%N 6
%P 1-13
%@ 2333-9721
%D 2014
%I Open Access Library
%R 10.4236/oalib.1100550
%X This paper proposes a scheme of combining low-density parity check (LDPC)
code with unitary space time modulation (USTM) for noncoherent
multiple-input-multiple-output (MIMO) transmitter and receiver over Rayleigh block
fading and additive white Gaussian noise (AWGN) channel. The main aim is to
design the low complexity coded noncoherent MIMO receiver which is completely
dependent on the structural feature of unitary space-time matrix without
sending the pilot symbol at the transmitter and estimating the channel state
information at the receiver. Considering soft information required by belief-propagation
(BP) iterative decoder of LDPC code, we deduce a maximum a
posteriori probability (MAP) demodulating algorithm using a special
USTM based on the sine-cosine function. A novel dual-demodulator is
conceived for decreasing the computational complexity of this MAP demodulator. Furthermore,
the iterative feedback scheme between MAP demodulator and BP decoder is introduced
and its modified parameter scheme is considered for further improving
performance of the dual-demodulator. Comparing with uncoded USTM, our
LDPC-coded USTM MIMO receiver can obtain about 17 dB coding gain
at 10<sup>��6</sup> BER.
%K Unitary Space-Time Modulation (USTM)
%K Log-Likelihood Ratio (LLP)
%K Maximum a Posteriori  Probability (MAP)
%K Demodulating Algorithm
%K Iterative Feedback
%K Low-Density Parity-Check  (LDPC) Code
%U http://www.oalib.com/paper/3064415