Beamforming Degradation of a W-CDMA Smart Antenna Under FDD and MAI Channel Estimation Errors

Author

Li, Chi-Min ; Li, Hsueh-Jyh ; Wang, Pao-Jen

Author_Institution

Dept. of Commun. & Guide Eng., Nat. Taiwan Ocean Univ.

Volume

6

fYear

2007

fDate

6/29/1905 12:00:00 AM

Firstpage

137

Lastpage

140

Abstract

A smart antenna adopts the beamforming technique to increase the signal-to-(interference plus noise) ratio (SINR) and system capacity. In this paper, the impact of two channel estimation errors - frequency-division duplex (FDD) estimation error and multiple-access interference (MAI) estimation error for the beamforming of a wide-band code-division multiple-access smart antenna - are analyzed by using the measured channel state information. Results show that for a complex conjugate beamforming, FDD estimation error will cause median degradation of less than 1 dB if the desired signal is in a line-of-sight (LOS) channel and 1-3 dB if in a non-LOS (NLOS) channel. In addition, the MAI estimation error will cause 0.3-0.5 dB degradation per interference in the LOS case and 0.5-1 dB degradation in the NLOS case

Keywords

adaptive antenna arrays; array signal processing; channel estimation; code division multiple access; frequency division multiplexing; matrix algebra; radiofrequency interference; FDD; MAI channel estimation errors; SINR; W-CDMA smart antenna; beamforming degradation; channel state information; frequency-division duplex estimation error; line-of-sight channel; multiple-access interference; non-LOS channel; signal-to-interference plus noise ratio; wide-band code-division multiple-access; Array signal processing; Broadband antennas; Channel estimation; Degradation; Estimation error; Frequency estimation; Information analysis; Multiaccess communication; Multiple access interference; Signal to noise ratio; Line-of-sight (LOS); non-LOS (NLOS); smart antenna; wide-band code-division multiple access (W-CDMA);

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2007.893100

Filename

4147567