Space-time diversity receiver for wireless systems

Details Space-time diversity receiver for wireless systems Space-time diversity receiver for wireless systems

1998-11-06

2001-10-16

Hunter, Daniel (Department: 2744)

Telecommunications

Receiver or analog modulated signal frequency converter

Plural receivers

C455S422100, C370S335000, C370S342000, C375S144000, C375S148000, C375S349000

Reexamination Certificate

active

06304750

ABSTRACT:

TECHNICAL FIELD
This invention relates to the art of wireless communication, and more particularly, to receivers used for code division multiple access (CDMA) systems.
BACKGROUND OF THE INVENTION
Prior art code division multiple access (CDMA) receivers having multiple antennas use a beamforming coefficient vector, i.e., a weight vector, to combine the outputs of several independent rake receiver modules each of which includes multiple rake receiver fingers and a summer, and each of which serves a respective one of the antennas. In such systems, optimization of the beamforming coefficients is performed independently of the optimization of the per-antenna receiver modules, the latter being performed by way of developing the rake multiplier coefficients for each rake receiver module based solely on information available within that rake receiver module. The outputs of the per-antenna receiver modules are weighted using the beamforming coefficient, and the weighted results combined to yield the decision statistic signal.
SUMMARY OF THE INVENTION
We have recognized that the performance of a CDMA receiver employing multiple antennas can be improved, in accordance with the principles of the invention, by directly combining together appropriately weighted signals from the rake receiver fingers that are being supplied by at least two different antennas, i.e., they are in two different receiver modules each of which is what would have been called in the prior art a rake receiver module but without the associated summer, to develop an output with at least as good, and more likely an improved, signal to interference and noise ratio (SINR), as compared to the prior art rake receiver architecture. By doing so the functionality of the beamforming coefficients and the rake multiplier vectors is joined, and it is possible to optimize the rake receiver performance. In other words, because of the inventive architecture, the optimization of the weights for the rake multiplier and the beam forming may be performed jointly to yield a single rake combining weight vector which optimally weights the output of each rake finger. In accordance with an aspect of the invention, a training sequence which is used to determine the rake combining weight vector may be received as a low bit-rate signal carried on the CDMA pilot signal.


REFERENCES:
patent: 5737327 (1998-04-01), Ling et al.
patent: 5809020 (1998-09-01), Bruckert et al.
patent: 5889815 (1999-03-01), Iwakiri
patent: 5926503 (1999-07-01), Kelton et al.
patent: 5937014 (1999-08-01), Pelin et al.
patent: 2311446 A (1997-09-01), None
patent: 10173629 A (1998-06-01), None
European Search Report No. EP 99 30 8679, Feb. 20, 2000—European Patent Office—The Hague.

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