Downlink beamforming approach for frequency division duplex cellular systems
The present invention relates to radio cellular mobile communications and relates to a downlink beamforming approach for frequency division duplex cellular systems. In particular, but not necessarily so restricted, the present invention relates to a downlink beamforming approach for code division mu...
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| Main Authors | , |
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| Format | Patent |
| Language | English |
| Published |
05.11.2002
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| Online Access | Get full text |
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| Summary: | The present invention relates to radio cellular mobile communications and relates to a downlink beamforming approach for frequency division duplex cellular systems. In particular, but not necessarily so restricted, the present invention relates to a downlink beamforming approach for code division multiple access (CDMA) systems.
The present invention relates to radio communication antennas and in particular relates to multi-user detection for CDMA antenna array receivers. Here is provided a method of operating a FDD radio communications system wherein a base station has a constrained beamformer comprising at least two antennas with L channel taps and is operable to maximize diversity gain at the mobile. The total SNR of all the multipath components received at the mobile will be less than for the maximum SNR algorithm, but the diversity gain should outweigh this loss for (nearly) orthogonal channel taps. The performance of an uplink fixed weight beamformer is determined from the correlation matrix of the fadings of the uplink sampled impulse response. Computation techniques are simplified and processing time can be considerably reduced. |
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