Hybrid Beamforming Scheme for CDMA Systems to Overcome the Insufficient Pilot Power Problem in Correlated SIMO Channels

Young-Kwan CHOI  DongKu KIM  

IEICE TRANSACTIONS on Communications   Vol.E88-B   No.3   pp.1303-1306
Publication Date: 2005/03/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.3.1303
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Antennas and Propagation
single-input-multiple-output (SIMO),  hybrid beamformer,  CDMA,  maximal ratio combining (MRC),  

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A hybrid beamformer composed of a direction-of-arrival (DOA) based scheme and maximal ratio combining (MRC) is proposed to overcome the degradation caused by inaccurate channel estimation due to insufficient pilot power, which happens in conventional single-input, multiple-output (SIMO) Code Division Multiple Access (CDMA) reverse link. The proposed scheme can provide more accurate channel estimation and interference reduction at the expense of diversity gain in the spatially correlated SIMO channel. As a result, the hybrid scheme outperforms conventional MRC beamformers for six or more antennas in the channel environment, in which the angle-of-spread (AOS) is within 30.