A Remote Calibration for a Transmitting Array Antenna by Using Synchronous Orthogonal Codes (Special Issue on Adaptive Array Antenna Techniques for Advanced Wireless Communications)
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概要
- 論文の詳細を見る
Precise and quick multi-beam forming including null control will be one of the key technologies for the future satellite communication systems utilizing SDMA (Space Division Multiple Acccss) and DOA (Direction of Arrival) estimation. In order to realize the precise multi-beam forming, calibration procedure is indispensable since there are several unavoidable factors that degrade the multi-beam patterns of the array. Particularly amplitude and phase imbalance between RF circuits needs to be calibrated frequently and quickly when the array system exists inchangeable environment since the imbalance easily occurs due to thermal characteristics of each RF circuit. This paper proposes as impleand high-speed remote calibration scheme compensating for amplitude and phase imbalance among RF circuits of a transmitting adaptive array antenna on board satellite. This calibration is conducted at a remotestation such as a gateway station on the ground in the satellite communication system, by utilizing the received signal including the temporally multiplexed orthogonal codes transmitted from the array antenna onboard satellite. Since the calibration factors for all the antenna elements can be simultaneously obtained by the parallel digital signal processing, calibration time can be drastically reduced. The accuracy of this calibration is estimated by simulation. Simulation results show that the amplitude imbalance among RF circuits can be suppressed within the range from -0.5dB to +0.25dB for the initial imbalance ranging from -2dB to +3.5dB, phase imbalance can be suppressed within the range of -3deg. to +3deg. for the initial imbalance ranging from -120 or +180deg. by this method. The amplitude and phase deviations among the elements can be suppressed with in 0.36dB and 2.5degrees, respectively, in 80% of probability. Simulation results also show that this calibration method is valid under the relatively bad carrier-to-noise conditions such as -10dB at the receiver. Good improvement of the multi-beam patterns by this calibration is shown under the low carrier-to-noise ratio condition.
- 社団法人電子情報通信学会の論文
- 2001-07-01
著者
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Miura Ryu
Wireless Innovation Systems Group Yokosuka Radio Communications Research Center Communications Resea
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OODO Masayuki
Wireless Innovation Systems Group, Yokosuka Radio Communications Research Center, Communications Res
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Oodo Masayuki
Wireless Innovation Systems Group Yokosuka Radio Communications Research Center Communications Resea