TY - GEN
T1 - Frequency-interleaved CDMA uplink transmission using frequency-domain equalization
AU - Takeda, Kazuaki
AU - Adachi, Fumiyuki
N1 - Publisher Copyright:
© 2005 IEEE.
PY - 2005
Y1 - 2005
N2 - The downlink bit error rate (BER) performances of DS- and MC-CDMA in a frequency-selective fading channel can be significantly improved by the use of frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion. However, the uplink BER performance degrades due to strong multi-user interference (MUI). In this paper, we propose frequency-interleaved CDMA using MMSE-FDE, in which the subcarrier components of each user's CDMA signal are interleaved onto wider bandwidth. Then, the frequency-interleaved CDMA signal is transformed into a time-domain signal by the inverse fast Fourier transform (IFFT). Interleaving patterns assigned to different users are orthogonal 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 BER performance in a frequency-selective Rayleigh fading channel.
AB - The downlink bit error rate (BER) performances of DS- and MC-CDMA in a frequency-selective fading channel can be significantly improved by the use of frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion. However, the uplink BER performance degrades due to strong multi-user interference (MUI). In this paper, we propose frequency-interleaved CDMA using MMSE-FDE, in which the subcarrier components of each user's CDMA signal are interleaved onto wider bandwidth. Then, the frequency-interleaved CDMA signal is transformed into a time-domain signal by the inverse fast Fourier transform (IFFT). Interleaving patterns assigned to different users are orthogonal 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 BER performance in a frequency-selective Rayleigh fading channel.
KW - CDMA
KW - Component
KW - Frequencyinterleaving
KW - MMSE-FDE
UR - http://www.scopus.com/inward/record.url?scp=84931306945&partnerID=8YFLogxK
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U2 - 10.1109/VETECF.2005.1558201
DO - 10.1109/VETECF.2005.1558201
M3 - Conference contribution
AN - SCOPUS:84931306945
T3 - IEEE Vehicular Technology Conference
SP - 1549
EP - 1553
BT - VTC 2005-Fall
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 62nd Vehicular Technology Conference, VTC 2005
Y2 - 25 September 2005 through 28 September 2005
ER -