Optimum Weight Generation Method for Adaptive Antenna Array Transmit Diversity in W-CDMA Forward Link

Shinya TANAKA; Taisuke IHARA; Mamoru SAWAHASHI

Optimum Weight Generation Method for Adaptive Antenna Array Transmit Diversity in W-CDMA Forward Link

Shinya TANAKA, Taisuke IHARA, Mamoru SAWAHASHI

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This paper investigates the optimum transmit-antenna-weight generation method for adaptive antenna array transmit diversity (AAA-TD) in the W-CDMA forward link: AAA-TD with beam and null steering (BNST), AAA-TD with beam steering (BST), or switched beam transmit diversity with fixed weights (SBTD-FW). The achievable BER performance after carrier frequency calibration in the transmit beam pattern is compared among the three methods assuming a different carrier frequency in a 2-GHz band with the carrier separation of 184.5 MHz based on computer simulations. The simulation results show that the achievable BER performance in the forward link using AAA-TD with BNST is almost identical to that using AAA-TD with BST when there are many more interfering users than there are array antennas, except for the special case when a small number of higher rate users exists in the reverse link. This is because by performing carrier frequency calibration, the directions of the beam nulls are shifted from the real directions of arrival (DOAs) of the interfering users. However, we also show that the required transmit E_b/N₀ at the average BER of 10^-3 using AAA-TD with BST is decreased by approximately 1.0 to 1.2 dB compared to that using SBTD-FW with 12 beams.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E84-A No.12 pp.3035-3044

Publication Date: 2001/12/01

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Type of Manuscript: Special Section PAPER (Special Section on Spread Spectrum Techniques and Applications)

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Shinya TANAKA, Taisuke IHARA, Mamoru SAWAHASHI, "Optimum Weight Generation Method for Adaptive Antenna Array Transmit Diversity in W-CDMA Forward Link" in IEICE TRANSACTIONS on Fundamentals, vol. E84-A, no. 12, pp. 3035-3044, December 2001, doi: .
Abstract: This paper investigates the optimum transmit-antenna-weight generation method for adaptive antenna array transmit diversity (AAA-TD) in the W-CDMA forward link: AAA-TD with beam and null steering (BNST), AAA-TD with beam steering (BST), or switched beam transmit diversity with fixed weights (SBTD-FW). The achievable BER performance after carrier frequency calibration in the transmit beam pattern is compared among the three methods assuming a different carrier frequency in a 2-GHz band with the carrier separation of 184.5 MHz based on computer simulations. The simulation results show that the achievable BER performance in the forward link using AAA-TD with BNST is almost identical to that using AAA-TD with BST when there are many more interfering users than there are array antennas, except for the special case when a small number of higher rate users exists in the reverse link. This is because by performing carrier frequency calibration, the directions of the beam nulls are shifted from the real directions of arrival (DOAs) of the interfering users. However, we also show that the required transmit E_b/N₀ at the average BER of 10^-3 using AAA-TD with BST is decreased by approximately 1.0 to 1.2 dB compared to that using SBTD-FW with 12 beams.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e84-a_12_3035/_p

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@ARTICLE{e84-a_12_3035,
author={Shinya TANAKA, Taisuke IHARA, Mamoru SAWAHASHI, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Optimum Weight Generation Method for Adaptive Antenna Array Transmit Diversity in W-CDMA Forward Link},
year={2001},
volume={E84-A},
number={12},
pages={3035-3044},
abstract={This paper investigates the optimum transmit-antenna-weight generation method for adaptive antenna array transmit diversity (AAA-TD) in the W-CDMA forward link: AAA-TD with beam and null steering (BNST), AAA-TD with beam steering (BST), or switched beam transmit diversity with fixed weights (SBTD-FW). The achievable BER performance after carrier frequency calibration in the transmit beam pattern is compared among the three methods assuming a different carrier frequency in a 2-GHz band with the carrier separation of 184.5 MHz based on computer simulations. The simulation results show that the achievable BER performance in the forward link using AAA-TD with BNST is almost identical to that using AAA-TD with BST when there are many more interfering users than there are array antennas, except for the special case when a small number of higher rate users exists in the reverse link. This is because by performing carrier frequency calibration, the directions of the beam nulls are shifted from the real directions of arrival (DOAs) of the interfering users. However, we also show that the required transmit E_b/N₀ at the average BER of 10^-3 using AAA-TD with BST is decreased by approximately 1.0 to 1.2 dB compared to that using SBTD-FW with 12 beams.},
keywords={},
doi={},
ISSN={},
month={December},}

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TY - JOUR
TI - Optimum Weight Generation Method for Adaptive Antenna Array Transmit Diversity in W-CDMA Forward Link
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 3035
EP - 3044
AU - Shinya TANAKA
AU - Taisuke IHARA
AU - Mamoru SAWAHASHI
PY - 2001
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E84-A
IS - 12
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - December 2001
AB - This paper investigates the optimum transmit-antenna-weight generation method for adaptive antenna array transmit diversity (AAA-TD) in the W-CDMA forward link: AAA-TD with beam and null steering (BNST), AAA-TD with beam steering (BST), or switched beam transmit diversity with fixed weights (SBTD-FW). The achievable BER performance after carrier frequency calibration in the transmit beam pattern is compared among the three methods assuming a different carrier frequency in a 2-GHz band with the carrier separation of 184.5 MHz based on computer simulations. The simulation results show that the achievable BER performance in the forward link using AAA-TD with BNST is almost identical to that using AAA-TD with BST when there are many more interfering users than there are array antennas, except for the special case when a small number of higher rate users exists in the reverse link. This is because by performing carrier frequency calibration, the directions of the beam nulls are shifted from the real directions of arrival (DOAs) of the interfering users. However, we also show that the required transmit E_b/N₀ at the average BER of 10^-3 using AAA-TD with BST is decreased by approximately 1.0 to 1.2 dB compared to that using SBTD-FW with 12 beams.
ER -