Modified SC-Type Turbo Detection Using SISO-MLD for CCI Suppression in SDM-OFDM Systems

Shoichi SASAHARA; Takahiko SABA

doi:10.1093/ietfec/e90-a.9.1854

Modified SC-Type Turbo Detection Using SISO-MLD for CCI Suppression in SDM-OFDM Systems

Shoichi SASAHARA, Takahiko SABA

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In space division multiplexing with orthogonal frequency division multiplexing (SDM-OFDM) systems, since co-channel interference (CCI) degrades the demodulation performance, CCI suppression is essential. For CCI suppression, the turbo detector using the soft-input soft-output maximum likelihood detector (SISO-MLD) is proposed. Although SISO-MLD can deal with soft information, SISO-MLD updates only a priori information of code bits at each iteration. This prevents the performance to be improved. Meanwhile, a turbo detector with soft cancellation (SC) followed by minimum mean square error (MMSE) filter, in which the variance of the residual interference components as well as a priori information can be updated at each iteration, is well known. However, the performance of SC/MMSE detector is also limited because it is proposed to reduce the computational complexity at the cost of performance degradation. In this paper, we propose an SC-type turbo detector which uses SISO-MLD for SDM-OFDM systems. In our proposed detector, the soft cancellation unit of the SC-type turbo detector is modified to cope with the SISO-MLD. From the simulation results, the proposed SC/MLD provides a better BER performance than the turbo detector using SISO-MLD. Furthermore, the proposed SC/MLD can attain the bit error rate (BER) equivalent to that of the SC/MMSE detector with a smaller computational complexity.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E90-A No.9 pp.1854-1861

Publication Date: 2007/09/01

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Online ISSN: 1745-1337

DOI: 10.1093/ietfec/e90-a.9.1854

Type of Manuscript: Special Section PAPER (Special Section on Information Theory and Its Applications)

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Shoichi SASAHARA, Takahiko SABA, "Modified SC-Type Turbo Detection Using SISO-MLD for CCI Suppression in SDM-OFDM Systems" in IEICE TRANSACTIONS on Fundamentals, vol. E90-A, no. 9, pp. 1854-1861, September 2007, doi: 10.1093/ietfec/e90-a.9.1854.
Abstract: In space division multiplexing with orthogonal frequency division multiplexing (SDM-OFDM) systems, since co-channel interference (CCI) degrades the demodulation performance, CCI suppression is essential. For CCI suppression, the turbo detector using the soft-input soft-output maximum likelihood detector (SISO-MLD) is proposed. Although SISO-MLD can deal with soft information, SISO-MLD updates only a priori information of code bits at each iteration. This prevents the performance to be improved. Meanwhile, a turbo detector with soft cancellation (SC) followed by minimum mean square error (MMSE) filter, in which the variance of the residual interference components as well as a priori information can be updated at each iteration, is well known. However, the performance of SC/MMSE detector is also limited because it is proposed to reduce the computational complexity at the cost of performance degradation. In this paper, we propose an SC-type turbo detector which uses SISO-MLD for SDM-OFDM systems. In our proposed detector, the soft cancellation unit of the SC-type turbo detector is modified to cope with the SISO-MLD. From the simulation results, the proposed SC/MLD provides a better BER performance than the turbo detector using SISO-MLD. Furthermore, the proposed SC/MLD can attain the bit error rate (BER) equivalent to that of the SC/MMSE detector with a smaller computational complexity.
URL: https://globals.ieice.org/en_transactions/fundamentals/10.1093/ietfec/e90-a.9.1854/_p

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@ARTICLE{e90-a_9_1854,
author={Shoichi SASAHARA, Takahiko SABA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Modified SC-Type Turbo Detection Using SISO-MLD for CCI Suppression in SDM-OFDM Systems},
year={2007},
volume={E90-A},
number={9},
pages={1854-1861},
abstract={In space division multiplexing with orthogonal frequency division multiplexing (SDM-OFDM) systems, since co-channel interference (CCI) degrades the demodulation performance, CCI suppression is essential. For CCI suppression, the turbo detector using the soft-input soft-output maximum likelihood detector (SISO-MLD) is proposed. Although SISO-MLD can deal with soft information, SISO-MLD updates only a priori information of code bits at each iteration. This prevents the performance to be improved. Meanwhile, a turbo detector with soft cancellation (SC) followed by minimum mean square error (MMSE) filter, in which the variance of the residual interference components as well as a priori information can be updated at each iteration, is well known. However, the performance of SC/MMSE detector is also limited because it is proposed to reduce the computational complexity at the cost of performance degradation. In this paper, we propose an SC-type turbo detector which uses SISO-MLD for SDM-OFDM systems. In our proposed detector, the soft cancellation unit of the SC-type turbo detector is modified to cope with the SISO-MLD. From the simulation results, the proposed SC/MLD provides a better BER performance than the turbo detector using SISO-MLD. Furthermore, the proposed SC/MLD can attain the bit error rate (BER) equivalent to that of the SC/MMSE detector with a smaller computational complexity.},
keywords={},
doi={10.1093/ietfec/e90-a.9.1854},
ISSN={1745-1337},
month={September},}

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TY - JOUR
TI - Modified SC-Type Turbo Detection Using SISO-MLD for CCI Suppression in SDM-OFDM Systems
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1854
EP - 1861
AU - Shoichi SASAHARA
AU - Takahiko SABA
PY - 2007
DO - 10.1093/ietfec/e90-a.9.1854
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E90-A
IS - 9
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - September 2007
AB - In space division multiplexing with orthogonal frequency division multiplexing (SDM-OFDM) systems, since co-channel interference (CCI) degrades the demodulation performance, CCI suppression is essential. For CCI suppression, the turbo detector using the soft-input soft-output maximum likelihood detector (SISO-MLD) is proposed. Although SISO-MLD can deal with soft information, SISO-MLD updates only a priori information of code bits at each iteration. This prevents the performance to be improved. Meanwhile, a turbo detector with soft cancellation (SC) followed by minimum mean square error (MMSE) filter, in which the variance of the residual interference components as well as a priori information can be updated at each iteration, is well known. However, the performance of SC/MMSE detector is also limited because it is proposed to reduce the computational complexity at the cost of performance degradation. In this paper, we propose an SC-type turbo detector which uses SISO-MLD for SDM-OFDM systems. In our proposed detector, the soft cancellation unit of the SC-type turbo detector is modified to cope with the SISO-MLD. From the simulation results, the proposed SC/MLD provides a better BER performance than the turbo detector using SISO-MLD. Furthermore, the proposed SC/MLD can attain the bit error rate (BER) equivalent to that of the SC/MMSE detector with a smaller computational complexity.
ER -