Method and system for signal phase variation detection in communication systems

Abstract

Aspects of a method and system for signal phase variation detection in communication systems are presented. Aspects of the system may enable detection of phase change between a current received symbol, and one or more previous received symbols. Based on the phase change a channel estimation filter bandwidth may be selected for despreading and/or descrambling one or more subsequent received symbols. In addition, a decision may be made as to whether the subsequent received symbols are to be received based on a closed loop system, or based on an open loop system.

1 - 22 . (canceled) 
     
     
         23 . A method for calculating a phase value for data contained in a signal received in a wireless communication system, the method comprising:
 selecting a quadrant in a phase calculation diagram based on a determined sign value of a imaginary component of a received symbol, and on a determined sign value of a real component of said received symbol;   selecting a sector in said selected quadrant based on a computed absolute value of a ratio of said imaginary component and said real component; and   computing a phase value based on said selected sector.   
     
     
         24 . The method according to  claim 23 , comprising selecting a first quadrant in said phase calculation diagram when said determined sign value of said imaginary component is a number greater than or equal to 0, and said determined sign value of said real component is a number greater than or equal to 0. 
     
     
         25 . The method according to  claim 23 , comprising selecting a second quadrant in said phase calculation diagram when said determined sign value of said imaginary component is a number greater than or equal to 0, and said determined sign value of said real component is a number less than 0. 
     
     
         26 . The method according to  claim 23 , comprising selecting a third quadrant in said phase calculation diagram when said determined sign value of said imaginary component is a number less than 0, and said determined sign value of said real component is a number less than 0. 
     
     
         27 . The method according to  claim 23 , comprising selecting a fourth quadrant in said phase calculation diagram when said determined sign value of said imaginary component is a number less than 0, and said determined sign value of said real component is a number greater than or equal to 0. 
     
     
         28 . The method according to  claim 23 , comprising selecting a first sector in said selected quadrant when an arctangent of said computed absolute value is less than or equal to a first threshold angle. 
     
     
         29 . The method according to  claim 23 , comprising selecting a third sector in said selected quadrant when an arctangent of said computed absolute value is greater than or equal to a second threshold angle. 
     
     
         30 . The method according to  claim 23 , comprising selecting a second sector in said selected quadrant when an arctangent of said computed absolute value is greater than a first threshold angle and less than a second threshold angle. 
     
     
         31 . A system for calculating a phase value for data contained in a signal received in a wireless communication system, the system comprising:
 one or more circuits that enable selection of a quadrant in a phase calculation diagram based on a determined sign value of a imaginary component of a received symbol, and on a determined sign value of a real component of said received symbol;   said one or more circuits enable selection of a sector in said selected quadrant based on a computed absolute value of a ratio of said imaginary component and said real component; and   said one or more circuits enable computation of a phase value based on said selected sector.   
     
     
         32 . The system according to  claim 31 , wherein said one or more circuits enable selection of a first quadrant in said phase calculation diagram when said determined sign value of said imaginary component is a number greater than or equal to 0, and said determined sign value of said real component is a number greater than or equal to 0. 
     
     
         33 . The system according to  claim 31 , wherein said one or more circuits enable selection of a second quadrant in said phase calculation diagram when said determined sign value of said imaginary component is a number greater than or equal to 0, and said determined sign value of said real component is a number less than 0. 
     
     
         34 . The system according to  claim 31 , wherein said one or more circuits enable selection of a third quadrant in said phase calculation diagram when said determined sign value of said imaginary component is a number less than 0, and said determined sign value of said real component is a number less than 0. 
     
     
         35 . The system according to  claim 31 , wherein said one or more circuits enable selection of a fourth quadrant in said phase calculation diagram when said determined sign value of said imaginary component is a number less than 0, and said determined sign value of said real component is a number greater than or equal to 0. 
     
     
         36 . The system according to  claim 31 , wherein said one or more circuits enable selection of a first sector in said selected quadrant when an arctangent of said computed absolute value is less than or equal to a first threshold angle. 
     
     
         37 . The system according to  claim 31 , wherein said one or more circuits enable selection of a third sector in said selected quadrant when an arctangent of said computed absolute value is greater than or equal to a second threshold angle. 
     
     
         38 . The system according to  claim 31 , wherein said one or more circuits enable selection of a second sector in said selected quadrant when an arctangent of said computed absolute value is greater than a first threshold angle and less than a second threshold angle.