Frequency-Interleaved Spread Spectrum with MMSE Frequency-Domain Equalization

Kazuaki TAKEDA; Fumiyuki ADACHI

doi:10.1093/ietcom/e90-b.2.260

Frequency-Interleaved Spread Spectrum with MMSE Frequency-Domain Equalization

Kazuaki TAKEDA, Fumiyuki ADACHI

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The use of frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can significantly improve the downlink bit error rate (BER) performances of DS- and MC-CDMA in a frequency-selective fading channel. However, the uplink BER performance degrades due to a strong multi-user interference (MUI). In this paper, we propose frequency-interleaved spread spectrum (SS) using MMSE-FDE, in which the subcarrier components of each user's signal are interleaved onto a wider bandwidth. Then, the frequency-interleaved frequency-domain signal is transformed into a time-domain signal by the inverse fast Fourier transform (IFFT). Frequency-interleaving patterns assigned to different users are orthogonal to each other. The proposed scheme can avoid the MUI completely while achieving frequency diversity gain due to MMSE-FDE. It is shown by computer simulation that the use of frequency-interleaving can significantly improve the uplink performance in a frequency-selective Rayleigh fading channel.

Publication: IEICE TRANSACTIONS on Communications Vol.E90-B No.2 pp.260-268

Publication Date: 2007/02/01

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Online ISSN: 1745-1345

DOI: 10.1093/ietcom/e90-b.2.260

Type of Manuscript: PAPER

Category: Wireless Communication Technologies

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Kazuaki TAKEDA, Fumiyuki ADACHI, "Frequency-Interleaved Spread Spectrum with MMSE Frequency-Domain Equalization" in IEICE TRANSACTIONS on Communications, vol. E90-B, no. 2, pp. 260-268, February 2007, doi: 10.1093/ietcom/e90-b.2.260.
Abstract: The use of frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can significantly improve the downlink bit error rate (BER) performances of DS- and MC-CDMA in a frequency-selective fading channel. However, the uplink BER performance degrades due to a strong multi-user interference (MUI). In this paper, we propose frequency-interleaved spread spectrum (SS) using MMSE-FDE, in which the subcarrier components of each user's signal are interleaved onto a wider bandwidth. Then, the frequency-interleaved frequency-domain signal is transformed into a time-domain signal by the inverse fast Fourier transform (IFFT). Frequency-interleaving patterns assigned to different users are orthogonal to each other. The proposed scheme can avoid the MUI completely while achieving frequency diversity gain due to MMSE-FDE. It is shown by computer simulation that the use of frequency-interleaving can significantly improve the uplink performance in a frequency-selective Rayleigh fading channel.
URL: https://globals.ieice.org/en_transactions/communications/10.1093/ietcom/e90-b.2.260/_p

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@ARTICLE{e90-b_2_260,
author={Kazuaki TAKEDA, Fumiyuki ADACHI, },
journal={IEICE TRANSACTIONS on Communications},
title={Frequency-Interleaved Spread Spectrum with MMSE Frequency-Domain Equalization},
year={2007},
volume={E90-B},
number={2},
pages={260-268},
abstract={The use of frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can significantly improve the downlink bit error rate (BER) performances of DS- and MC-CDMA in a frequency-selective fading channel. However, the uplink BER performance degrades due to a strong multi-user interference (MUI). In this paper, we propose frequency-interleaved spread spectrum (SS) using MMSE-FDE, in which the subcarrier components of each user's signal are interleaved onto a wider bandwidth. Then, the frequency-interleaved frequency-domain signal is transformed into a time-domain signal by the inverse fast Fourier transform (IFFT). Frequency-interleaving patterns assigned to different users are orthogonal to each other. The proposed scheme can avoid the MUI completely while achieving frequency diversity gain due to MMSE-FDE. It is shown by computer simulation that the use of frequency-interleaving can significantly improve the uplink performance in a frequency-selective Rayleigh fading channel.},
keywords={},
doi={10.1093/ietcom/e90-b.2.260},
ISSN={1745-1345},
month={February},}

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TY - JOUR
TI - Frequency-Interleaved Spread Spectrum with MMSE Frequency-Domain Equalization
T2 - IEICE TRANSACTIONS on Communications
SP - 260
EP - 268
AU - Kazuaki TAKEDA
AU - Fumiyuki ADACHI
PY - 2007
DO - 10.1093/ietcom/e90-b.2.260
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E90-B
IS - 2
JA - IEICE TRANSACTIONS on Communications
Y1 - February 2007
AB - The use of frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion can significantly improve the downlink bit error rate (BER) performances of DS- and MC-CDMA in a frequency-selective fading channel. However, the uplink BER performance degrades due to a strong multi-user interference (MUI). In this paper, we propose frequency-interleaved spread spectrum (SS) using MMSE-FDE, in which the subcarrier components of each user's signal are interleaved onto a wider bandwidth. Then, the frequency-interleaved frequency-domain signal is transformed into a time-domain signal by the inverse fast Fourier transform (IFFT). Frequency-interleaving patterns assigned to different users are orthogonal to each other. The proposed scheme can avoid the MUI completely while achieving frequency diversity gain due to MMSE-FDE. It is shown by computer simulation that the use of frequency-interleaving can significantly improve the uplink performance in a frequency-selective Rayleigh fading channel.
ER -