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Performance Evaluation of MIMOOFDM with Twin Turbo Decoder
Yasuyuki HATAKAWA Noriaki MIYAZAKI Toshinori SUZUKI
Publication
IEICE TRANSACTIONS on Communications
Vol.E92B
No.1
pp.228236 Publication Date: 2009/01/01
Online ISSN: 17451345
DOI: 10.1587/transcom.E92.B.228
Print ISSN: 09168516 Type of Manuscript: PAPER Category: Wireless Communication Technologies Keyword: iterative decoder, multipleinput multipleoutput, FEC (Forward Error Correction), correlated channel, turbo coding, computational complexity,
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Summary:
This paper proposes Twin Turbo (T2) MIMOOFDM (Multiple Input Multiple OutputOrthogonal Frequency Division Multiplexing). The advanced iterative decoder, called the T2 decoder, decreases the transmission error rate compared to conventional turbo decoders because it uses the correlation information among the bits mapped on an identical symbol of multilevel modulation and updates the channel reliability. When T2 is applied to a MIMOOFDM, the required symbol energy to noise power density ratio (E_{s}/N_{0}) can be reduced more effectively than when T2 is applied to SISO (Single Input Single Output). This is because T2 can use the correlation among the bits not only mapped on an identical symbol but also transmitted from different antennas. Moreover, T2 achieves good performance in a correlated MIMO channel because the average minimum squared Euclidean distances between symbol replica candidates consisting of signals transmitted from multiple transmitter antennas are reduced. Computer simulations verify that the required E_{s}/N_{0} of T2 MIMOOFDM using 16QAM is 1.9 dB lower than that of a conventional turbo decoder when the correlation coefficients of transmitter and receiver antennas are 0.8. A computational complexity analysis clarifies the relation between the increase in computational complexity and the reduction in the required E_{s}/N_{0}.

