Asymmetric perturbation method for a mobile transmit diversity communication device

Abstract

A method and apparatus for selectively adjusting transmit diversity parameters in a mobile communication system including a mobile device and a base station. The mobile device transmits a signal set comprised of a plurality of signals differing only in phase from one another, receive in response an input parameter for each set, and adjust the phase difference of a subsequently transmitted signal set as a function of the input parameters.

1 . A method for delivering an improved wireless transmission signal set by a mobile device, the method comprising the steps of:
 transmitting a plurality of signal sets directed to a base station, each signal set comprising the same number of signals, all signals in a set differing only in phase;   receiving a plurality of input parameters, each input parameter corresponding to a transmitted signal set in response;   deriving a received signal quality measure for said transmitted signal sets as a function of said plurality of received input parameters; and   delivering an improved signal set, where the delivered phase differences of the signals in the improved signal set are determined as a function of the received signal quality measure.   
     
     
         2 . The method of  claim 1 , wherein each input parameter represents a parameter selected from the group consisting of relative phase, relative amplitude, absolute power, frequency of modification, and timing of application of a transmitted signal set. 
     
     
         3 . The method of  claim 1 , where each input parameter is a transmit power control parameter. 
     
     
         4 . The method of  claim 1 , where each said input parameter represents a recommendation for improved power levels. 
     
     
         5 . The method of  claim 1 , where the signal quality measure represents a measure of the received power level. 
     
     
         6 . The method of  claim 1 , wherein said function includes recently received input parameters. 
     
     
         7 . The method of  claim 1 , wherein said function includes only the most recently received input parameters. 
     
     
         8 . The method of  claim 6 , wherein said function includes de-weighting factors applied to input parameters. 
     
     
         9 . The method of  claim 8 , wherein said de-weighting factors weigh input parameters more heavily based on when each is received. 
     
     
         10 . The method of  claim 6 , where said function accounts for non-uniform responses by making no adjustment in said improved signal set as a consequence of input parameters. 
     
     
         11 . The method of  claim 6 , where said function identifies the majority value among input parameters and accounts for non-uniform values by making adjustment in said improved signal set based on the majority. 
     
     
         12 . The method of  claim 11  where the extent of the adjustment is proportional to the extent of the majority. 
     
     
         13 . The method of  claim 6 , wherein the number of input parameters included in said function is an even number, and if there is no majority value of input parameters, said function makes no adjustment in said improved signal set based on said input parameters. 
     
     
         14 . The method of  claim 1 , where each signal in a signal set is transmitted by a different antenna. 
     
     
         15 . A mobile subscriber unit apparatus adapted to deliver an improved wireless transmission signal set comprising:
 a transmitter to transmit signal sets directed to a base station,   a receiver to receive an input parameter in response to a transmitted signal set,   a processor to derive a calculated received signal quality measure, and   a signal generator to generate a plurality of signals for transmission;   wherein said transmitter transmits a plurality of signal sets directed to a base station, in response said receiver receives one input parameter per transmitted signal set, said processor calculates a received signal quality measure as a function of a plurality of received input parameters, and said signal generator generates an improved signal set for transmission to said base station, and   wherein each signal set comprising the same number of signals and all signals in a set differing only in phase; and   wherein the delivered phase differences of the signals in the improved signal set are determined as a function of the received signal quality measure.   
     
     
         16 . The apparatus of  claim 15 , wherein said input parameter represents a parameter selected from the group consisting of relative phase, relative amplitude, relative power, absolute power, frequency of modification, and timing of application of a transmitted signal set. 
     
     
         17 . The apparatus of  claim 15 , where the input parameter is a transmit power control parameter. 
     
     
         18 . The apparatus of  claim 15 , where each said input parameter represents a recommendation for improved power levels. 
     
     
         19 . The apparatus of  claim 15 , where the signal quality measure represents a measure of the received power level. 
     
     
         20 . The apparatus of  claim 15 , wherein said function includes recently received input parameters. 
     
     
         21 . The apparatus of  claim 15 , wherein said function includes only the most recently received input parameters. 
     
     
         22 . The apparatus of  claim 20 , wherein said function includes de-weighting factors applied to input parameters. 
     
     
         23 . The apparatus of  claim 22 , wherein said de-weighting factors weigh input parameters more heavily based on when each is received. 
     
     
         24 . The apparatus of  claim 20 , where said function accounts for non-uniform responses by making no adjustment in said improved signal set as a consequence of input parameters. 
     
     
         25 . The apparatus of  claim 20 , where said function identifies the majority value among input parameters and accounts for non-uniform values by making adjustment in said improved signal set based on the majority. 
     
     
         26 . The apparatus of  claim 25  where the extent of the adjustment is proportional to the extent of the majority. 
     
     
         27 . The apparatus of  claim 20 , wherein the number of input parameters included in said function is an even number, and if there is no majority value of input parameters, said function makes no adjustment in said improved signal set based on said input parameters. 
     
     
         28 . The apparatus of  claim 15 , where each signal in a signal set is transmitted by a different antenna.