TITLE:
Complexity Reduced MIMO Interleaved SC-FDMA Receiver with Iterative Detection
AUTHORS:
Masaki Tsukamoto, Yasunori Iwanami
KEYWORDS:
Interleaved SC-FDMA, MLD, QRD-M, Sphere Decoding, RTS, STS, Iterative Detection, Complexity Reduction
JOURNAL NAME:
International Journal of Communications, Network and System Sciences,
Vol.7 No.12,
December
3,
2014
ABSTRACT: In this paper, we propose the receiver
structure for Multiple Input Multiple Output (MIMO) Interleaved Single
Carrier-Frequency Division Multiple Access (SC-FDMA) where the Frequency Domain
Equalization (FDE) is firstly done for obtaining the tentative decision results
and secondly using them the Inter-Symbol Interference (ISI) is cancelled by ISI
canceller and then the Maximum Likelihood Detection (MLD) is used for
separating the spatially multiplexed signals. Furthermore the output from MLD
is fed back to ISI canceller repeatedly. In order to reduce the complexity, we
replace the MLD by QR Decomposition with M-Algorithm (QRD-M) or Sphere Decoding
(SD). Moreover, we add the soft output function to SD using Repeated Tree
Search (RTS) algorithm to generate soft replica for ISI cancellation. We also
refer to the Single Tree Search (STS) algorithm to further reduce the
complexity of RTS. By examining the BER characteristics and the complexity
reduction through computer simulations, we have verified the effectiveness of
proposed receiver structure.