Communications: directive radio wave systems and devices (e.g. – Directive – Utilizing correlation techniques
Reexamination Certificate
2000-01-11
2001-05-15
Tarcza, Thomas H. (Department: 3662)
Communications: directive radio wave systems and devices (e.g.,
Directive
Utilizing correlation techniques
Reexamination Certificate
active
06232921
ABSTRACT:
FIELD OF INVENTION
This invention relates to a method and system for adaptive signal processing for an antenna array of a wireless communications system.
BACKGROUND
An adaptive algorithm may be used to improve uplink performance, downlink performance, or both of an antenna array. An adaptive algorithm evaluates reception characteristics of one or more uplink signals to provide guidance in altering signal processing associated with antenna performance. For example, the uplink beam can be filtered or steered toward a direction that provides the best signal-to-noise ratio of the received uplink signals. As an array antenna increases in the number of antenna elements, the processing resources or the processing time required for execution of the adaptive algorithm increases as well. Where an antenna array uses an elaborate adaptive algorithm, overburdened processing resources may respond too slowly to compensate for fading or movement of mobile stations present in a wireless communications system. While greater data processing resources can compensate for a greater number of antenna elements or a more complex adaptive algorithm, the increased manufacturing cost may render such extensive design modifications impractical. Thus, a need exists for reducing the processing resources or processing time associated with execution of an adaptive algorithm for an antenna array.
SUMMARY OF THE INVENTION
In accordance with an embodiment of the invention, a method and system for adaptive signal processing for an antenna array reduces the requisite computations for executing an adaptive algorithm that combines or digitally filters baseband receive signals. The system receives M uplink electromagnetic signals from a phased array and N uplink electromagnetic signals from a diversity array during the reception of an electromagnetic signal transmitted by a mobile station, where M and N have values of positive integers. The M and N uplink signals are converted into baseband signals for digital signal processing. The baseband signals are observable as a series of successive time slots. The system determines M uplink coarse combining weights associated with the uplink baseband signals and M downlink coarse combining weights associated with the downlink baseband signals of the phased array. The M baseband uplink signals are summed into as few as one resultant baseband signal during or after application of the M coarse combining weights to the M baseband uplink signals. The system determines as few as N+1 fine combining weights for the one resultant baseband signal and the N baseband uplink signals on a symbol-by-symbol basis, or on any durational basis less than a time slot, to combine as few as N+1 signals into a single enhanced baseband signal for symbol detection. The enhanced baseband signal is well-suited for decoding because of potential enhancement from diversity gain and interference reduction from the adaptive signal processing.
REFERENCES:
patent: 4720712 (1988-01-01), Brookner et al.
patent: 5835487 (1998-11-01), Campanella
patent: 6105060 (2000-08-01), Rothblatt
Aiken Richard Thomas
Benning Roger David
Uptegrove Dirck
Lucent Technologies - Inc.
Phan Dao L.
Tarcza Thomas H.
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