A New Blind Beamforming Procedure Based on the Conjugate Gradient Method for CDMA Mobile Communications
| Autor: | Chung Kun Lee, Eung Soon Shin, Dong Hee Shim, Youn Ok Park, Mun Geon Kyeong, Seungwon Choi, KyungHi Chang, Ki Chul Han |
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| Rok vydání: | 1998 |
| Předmět: |
Beamforming
Engineering General Computer Science business.industry Code division multiple access Smart antenna Signal-to-interference-plus-noise ratio Electronic Optical and Magnetic Materials Antenna array Signal-to-noise ratio Electronic engineering Electrical and Electronic Engineering business Adaptive beamformer Digital signal processing |
| Zdroj: | ETRI Journal. 20:133-148 |
| ISSN: | 1225-6463 |
| DOI: | 10.4218/etrij.98.0198.0202 |
| Popis: | The objective of this paper is to present an adaptive algorithm for computing the weight vector which provides a beam pattern having its maximum gain along the direction of the mobile target signal source in the presence of interfering signals within a cell. The conjugate gradient method (CGM) is modified in such a way that the suboptimal weight vector is produced with the computational load of O(16N), which has been found to be small enough for the real-time processing of signals in most land mobile communications with the digital signal processor (DSP) off the shelf, where N denotes the number of antenna elements of the array. The adaptive procedure proposed in this paper is applied to code division multiple access (CDMA) mobile communication system to show its excellent performance in terms of signal to interference plus noise ratio (SINR), bit error rate (BER), and capacity, which are enhanced by about 7 dB, 1/100 times, and 7 times, respectively, when the number of antenna elements is 6 and the processing gain is 20 dB. |
| Databáze: | OpenAIRE |
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