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Conference Paper
Hybrid beamforming in WCDMA antenna array system
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- Authors
- Hyekyung Jwa, Seungchan Bang
- Issue Date
- 2004-09
- Citation
- Vehicular Technology Conference (VTC) 2004 (Fall), pp.252-255
- Publisher
- IEEE
- Language
- English
- Type
- Conference Paper
- Abstract
- In the Chip–Level Beamforming, the received signal vector at chip-rate and known pilot symbols are used to find a beamforming weight vector. But in WCDMA FDD uplink, because the DPDCH and DPCCH are code–multiplexed and weighted by gain factors, the chip energy of DPCCH is less than the chip energy of DPDCH in the chip (subchip) rate received signal vector. As users transmit higher DPDCH date rate (lower DPDCH spreading factor), the performance of the Chip–Level Beamforming may be degraded. In this paper, we proposed Hybrid Beamforming, which generates a beamforming weight vector using the despreaded DPCCH symbols and known pilot symbols at symbol rate, and beamforms at chip (subchip) rate. The simulation results shows the performances of Chip–Level Beamforming and Hybrid Beamforming based on NLMS (Normalized LMS) algorithm for different DPDCH data rates.
- KSP Keywords
- Normalized LMS(NLMS), Pilot symbols, Spreading factor, Weight vector, antenna array, data rate, hybrid beamforming, simulation results, symbol rate