Title :
A self-calibration algorithm for an asynchronous CDMA-based antenna array
Author :
Lee, Chong Hyun ; Chun, Joohwan
Author_Institution :
Dept. of Electr. Eng., Korea Adv. Inst. of Sci. & Technol., Taejon, South Korea
Abstract :
A new iterative calibration algorithm for an asynchronous CDMA-based antenna array in the presence of unknown gain and phase errors is presented. The algorithm is applicable to a nonuniform array where the number of users could be greater than the number of antennas, and does not require a prior knowledge of the DOAs of the signals of any user. The method requires the code sequence of a reference user only. The proposed algorithm provides us with the joint estimates of the spatial signature and the channel impulse response of the used signal sources as well as the calibration of the sensor gains and phases, even under multiple access interference. The algorithm is near-far resistant and thus well suited for the multipath fading channel
Keywords :
adaptive antenna arrays; broadband networks; calibration; code division multiple access; land mobile radio; multipath channels; multiuser channels; parameter estimation; radio networks; radiofrequency interference; spread spectrum communication; transient response; W-CDMA; adaptive antenna array; asynchronous CDMA-based antenna array; channel impulse response; code sequence; gain errors; iterative calibration algorithm; joint estimates; minimum variance method; mobile multimedia services; multipath fading channel; multiple access interference; near-far resistant algorithm; nonuniform array; phase errors; self-calibration algorithm; signal sources; spatial signature; wideband DS-CDMA; Adaptive arrays; Antenna arrays; Calibration; Direction of arrival estimation; Fading; Iterative algorithms; Multiaccess communication; Phased arrays; Sensor arrays; Wideband;
Conference_Titel :
Vehicular Technology Conference, 2000. IEEE-VTS Fall VTC 2000. 52nd
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-6507-0
DOI :
10.1109/VETECF.2000.883301
