A Channel Equalization Technique on a Time Division Duplex CDMA/TDMA System for Wireless Multimedia Networks

Yukitoshi SANADA; Kazuhiko SEKI; Qiang WANG; Shuzo KATO; Masao NAKAGAWA; Vijay K. BHARGAVA

A Channel Equalization Technique on a Time Division Duplex CDMA/TDMA System for Wireless Multimedia Networks

Yukitoshi SANADA, Kazuhiko SEKI, Qiang WANG, Shuzo KATO, Masao NAKAGAWA, Vijay K. BHARGAVA

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A channel equalization technique on a time division duplex CDMA/TDMA system for wireless multimedia networks is investigated, and the bit error rate performance of the system is theoretically analyzed. The assumed network connects mobile terminals to a node of ATM based high speed LAN through a radio central unit. Only human interface facilities are implemented into the terminal so that users access integrated services through the node of the network. The uplink (from a mobile terminal to a radio central unit) employs a CDMA scheme to transmit human interface signals and the downlink employs a TDMA scheme to transmit display interface signals. Both the CDMA and the TDMA signals occupy the same frequency band. To mitigate bit error rate degradation due to fading, the radio central unit estimates the impulse response of the channel from the received CDMA signals and subtracts the replica signal to cancel the major intersymbol interference (ISI) component. Numerical results using the Nakagami-m fading model and recent propagation measurements show that the proposed TPC technique compensates the fading attenuation and the proposed CEQ cancels the major ISI component. The bit error rate performance of the downlink with the proposed CEQ is superior to that with the DFE by 12dB of the symbol SNR at the BER=10^-6 over a specular channel, and the system with the proposed CEQ achieves a BER=10^-6 at the symbol SNR=12dB. Furthermore, the channel equalizer is implemented without increases in complexity of the terminal because all the processing on the equalization is carried out only in the radio central unit.

Publication: IEICE TRANSACTIONS on Communications Vol.E78-B No.8 pp.1105-1116

Publication Date: 1995/08/25

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Type of Manuscript: Special Section PAPER (Special Issue on Technologies for High-Speed Mobile Communications)

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Yukitoshi SANADA, Kazuhiko SEKI, Qiang WANG, Shuzo KATO, Masao NAKAGAWA, Vijay K. BHARGAVA, "A Channel Equalization Technique on a Time Division Duplex CDMA/TDMA System for Wireless Multimedia Networks" in IEICE TRANSACTIONS on Communications, vol. E78-B, no. 8, pp. 1105-1116, August 1995, doi: .
Abstract: A channel equalization technique on a time division duplex CDMA/TDMA system for wireless multimedia networks is investigated, and the bit error rate performance of the system is theoretically analyzed. The assumed network connects mobile terminals to a node of ATM based high speed LAN through a radio central unit. Only human interface facilities are implemented into the terminal so that users access integrated services through the node of the network. The uplink (from a mobile terminal to a radio central unit) employs a CDMA scheme to transmit human interface signals and the downlink employs a TDMA scheme to transmit display interface signals. Both the CDMA and the TDMA signals occupy the same frequency band. To mitigate bit error rate degradation due to fading, the radio central unit estimates the impulse response of the channel from the received CDMA signals and subtracts the replica signal to cancel the major intersymbol interference (ISI) component. Numerical results using the Nakagami-m fading model and recent propagation measurements show that the proposed TPC technique compensates the fading attenuation and the proposed CEQ cancels the major ISI component. The bit error rate performance of the downlink with the proposed CEQ is superior to that with the DFE by 12dB of the symbol SNR at the BER=10^-6 over a specular channel, and the system with the proposed CEQ achieves a BER=10^-6 at the symbol SNR=12dB. Furthermore, the channel equalizer is implemented without increases in complexity of the terminal because all the processing on the equalization is carried out only in the radio central unit.
URL: https://globals.ieice.org/en_transactions/communications/10.1587/e78-b_8_1105/_p

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@ARTICLE{e78-b_8_1105,
author={Yukitoshi SANADA, Kazuhiko SEKI, Qiang WANG, Shuzo KATO, Masao NAKAGAWA, Vijay K. BHARGAVA, },
journal={IEICE TRANSACTIONS on Communications},
title={A Channel Equalization Technique on a Time Division Duplex CDMA/TDMA System for Wireless Multimedia Networks},
year={1995},
volume={E78-B},
number={8},
pages={1105-1116},
abstract={A channel equalization technique on a time division duplex CDMA/TDMA system for wireless multimedia networks is investigated, and the bit error rate performance of the system is theoretically analyzed. The assumed network connects mobile terminals to a node of ATM based high speed LAN through a radio central unit. Only human interface facilities are implemented into the terminal so that users access integrated services through the node of the network. The uplink (from a mobile terminal to a radio central unit) employs a CDMA scheme to transmit human interface signals and the downlink employs a TDMA scheme to transmit display interface signals. Both the CDMA and the TDMA signals occupy the same frequency band. To mitigate bit error rate degradation due to fading, the radio central unit estimates the impulse response of the channel from the received CDMA signals and subtracts the replica signal to cancel the major intersymbol interference (ISI) component. Numerical results using the Nakagami-m fading model and recent propagation measurements show that the proposed TPC technique compensates the fading attenuation and the proposed CEQ cancels the major ISI component. The bit error rate performance of the downlink with the proposed CEQ is superior to that with the DFE by 12dB of the symbol SNR at the BER=10^-6 over a specular channel, and the system with the proposed CEQ achieves a BER=10^-6 at the symbol SNR=12dB. Furthermore, the channel equalizer is implemented without increases in complexity of the terminal because all the processing on the equalization is carried out only in the radio central unit.},
keywords={},
doi={},
ISSN={},
month={August},}

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TY - JOUR
TI - A Channel Equalization Technique on a Time Division Duplex CDMA/TDMA System for Wireless Multimedia Networks
T2 - IEICE TRANSACTIONS on Communications
SP - 1105
EP - 1116
AU - Yukitoshi SANADA
AU - Kazuhiko SEKI
AU - Qiang WANG
AU - Shuzo KATO
AU - Masao NAKAGAWA
AU - Vijay K. BHARGAVA
PY - 1995
DO -
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E78-B
IS - 8
JA - IEICE TRANSACTIONS on Communications
Y1 - August 1995
AB - A channel equalization technique on a time division duplex CDMA/TDMA system for wireless multimedia networks is investigated, and the bit error rate performance of the system is theoretically analyzed. The assumed network connects mobile terminals to a node of ATM based high speed LAN through a radio central unit. Only human interface facilities are implemented into the terminal so that users access integrated services through the node of the network. The uplink (from a mobile terminal to a radio central unit) employs a CDMA scheme to transmit human interface signals and the downlink employs a TDMA scheme to transmit display interface signals. Both the CDMA and the TDMA signals occupy the same frequency band. To mitigate bit error rate degradation due to fading, the radio central unit estimates the impulse response of the channel from the received CDMA signals and subtracts the replica signal to cancel the major intersymbol interference (ISI) component. Numerical results using the Nakagami-m fading model and recent propagation measurements show that the proposed TPC technique compensates the fading attenuation and the proposed CEQ cancels the major ISI component. The bit error rate performance of the downlink with the proposed CEQ is superior to that with the DFE by 12dB of the symbol SNR at the BER=10^-6 over a specular channel, and the system with the proposed CEQ achieves a BER=10^-6 at the symbol SNR=12dB. Furthermore, the channel equalizer is implemented without increases in complexity of the terminal because all the processing on the equalization is carried out only in the radio central unit.
ER -