Title :
Fast switched-beam beamforming for optimal selection combining in frequency selective fading CDMA channels
Author :
Logothetis, Andrew ; Poor, H. Vincent
Author_Institution :
Dept. of Electr. Eng., Princeton Univ., NJ, USA
Abstract :
In previous work we emphasized the advantages of using a fast switched multibeam antenna for channel estimation in multipath Rayleigh flat-fading code division multiple access (CDMA) communication channels. In this paper we investigate the benefits of designing fast switched-beam antenna systems that maximize the signal to interference plus noise ratio (SNIR) of the desired user, when the signals are subject to frequency selective fading. The diversity offered by multipath propagation is exploited using selection combining. The aim is to, given a set of predetermined beam patters, select the chip rate switching beam sequence that will maximize the signal strength of the desired user, while minimize the interference from all other users
Keywords :
Rayleigh channels; adaptive antenna arrays; array signal processing; code division multiple access; direction-of-arrival estimation; diversity reception; interference suppression; multibeam antennas; multipath channels; multiuser channels; optimisation; radiofrequency interference; receiving antennas; spread spectrum communication; DOA estimation; Gaussian model; SNIR; beam patters; channel estimation; chip rate switching beam sequence; code division multiple access; diversity; fast switched-beam beamforming; frequency selective fading CDMA channels; interference minimisation; linear model; multibeam antenna array; multipath Rayleigh flat-fading; multipath propagation; optimal selection combining; selection combining; signal strength; signal to interference plus noise ratio; smart antenna; switched-beam antenna array receiver; time-varying state-space model; Antennas and propagation; Array signal processing; Channel estimation; Communication channels; Communication switching; Diversity reception; Interference; Multiaccess communication; Signal design; Signal to noise ratio;
Conference_Titel :
Spread Spectrum Techniques and Applications, 2000 IEEE Sixth International Symposium on
Conference_Location :
Parsippany, NJ
Print_ISBN :
0-7803-6560-7
DOI :
10.1109/ISSSTA.2000.878073
