Presentation	2004-08-27 On-Line RF Circuitry Calibration Methods Appropriate for Adaptive Antenna Array-Beam Forming Transmitter in Forward Link OFCDM Broadband Wireless Access Hidekazu Taoka, Takashi Kataoka, Kenichi Higuchi, Mamoru Sawahashi, Yasuhiro Hasegawa, Keiji Takakusaki,
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Abstract(in English)	This paper proposes an on-line RF transmitter circuitry calibration method, in which calibration values of amplitide and phase fluctuations of parallel RF transmitter circuitries are measured and compensated independently at each frequency block segmented for adaptive antenna array-beam forming (AAA-BF) transmitter in the braodband forward link with 100 MHz-bandwidth. Then, by implemented Orthogonal Frequency and Code Division Multiplexing (OFCDM) transceiver, the performance of AAA-BF transmitter after the propsoed on-line RF transmitter circuitry calibration is investigated. Laboratory experimental results elucidate that the required transmit energy per bit-to-background noise power spectrum densitiy ratio (E_b/N_0) at the average block error rate (BLER) of 10^<-2> with frequency blocks of N_ = 12 is reduced by approximately 0.3 dB compared to that of N_ = 1 owing to the decreasing residual amplitude/phase errors. Furthermore, it is shown that even when averaging time for measuring on-line RF transmitter calibration factor is 100 msec, the loss in the required transmit E_b/N_O with N_ = 12 (i.e., calibration factors are averaged over adjacent 64 sub-carriers) is only within 0.1 dB compared to the case with sufficiently accurate calibration condition (averaging time of 1 sec) using off-line calibration method.
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Keyword(in English)	adaptive antenna array / RF circuitry calibration / DOA estimation / OFCDM
Paper #	RCS2004-145
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Committee	RCS
Conference Date	2004/8/20(1days)
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Paper Information
Registration To	Radio Communication Systems (RCS)
Language	JPN
Title (in Japanese)	(See Japanese page)
Sub Title (in Japanese)	(See Japanese page)
Title (in English)	On-Line RF Circuitry Calibration Methods Appropriate for Adaptive Antenna Array-Beam Forming Transmitter in Forward Link OFCDM Broadband Wireless Access
Sub Title (in English)
Keyword(1)	adaptive antenna array
Keyword(2)	RF circuitry calibration
Keyword(3)	DOA estimation
Keyword(4)	OFCDM
1st Author's Name	Hidekazu Taoka
1st Author's Affiliation	NTT DoCoMo, Inc.()
2nd Author's Name	Takashi Kataoka
2nd Author's Affiliation	NTT DoCoMo, Inc.
3rd Author's Name	Kenichi Higuchi
3rd Author's Affiliation	NTT DoCoMo, Inc.
4th Author's Name	Mamoru Sawahashi
4th Author's Affiliation	NTT DoCoMo, Inc.
5th Author's Name	Yasuhiro Hasegawa
5th Author's Affiliation	Panasonic Mobile Communications Sendai R&D Lab. Co., Ltd.
6th Author's Name	Keiji Takakusaki
6th Author's Affiliation	Panasonic Mobile Communications Co., Ltd R&D Center
Date	2004-08-27
Paper #	RCS2004-145
Volume (vol)	vol.104
Number (no)	258
Page	pp.pp.-
#Pages	6
Date of Issue