Method and apparatus for controlling a TX power amplifier

Abstract

A method and an apparatus for controlling a TX power amplifier are provided in the present invention. The invention is applied for generating a power control curve in a power variation area to control the power variation for signal transmission when the TX power amplifier transmits the data during two continuous time slots, which are a first time slot and a second time slot, respectively have a first transmission power value K 1 and a second transmission power value K 2. The invention is aimed at producing a concave down inter-ramp control curve in a inter-ramp division of the power variation area for controlling the power variation of the TX power amplifier, where the power for signal transmission is transformed from the first transmission power value K 1 to the second transmission power value K 2.

1 . A method of controlling output power of a device in a multi-slot wireless communication system, comprising: 
 providing a first power value at a first time point in a first slot;    providing a second power value at a second time point in a second slot, wherein the second slot is adjacent to the first slot;    providing at least one original power curve;    generating an output power curve according to the original power curve between the first time point and the second time point, wherein at least one power value of the output power curve is substantially less than the first power value and the second power value; and    adjusting the output power according to the output power curve.    
     
     
         2 . The method of  claim 1 , wherein the original power curve comprises a polynomial function.  
     
     
         3 . The method of  claim 1 , wherein the original power curve comprises a first power curve FL(t) and a second power curve FR(t) and the output power curve comprises a first portion FL′(t) scaled into SL′*FL(t) and a second portion FR′(t) scaled into SR′*FR(t), wherein SL′=the first power value minus H and SR′=the second power value minus H.  
     
     
         4 . An apparatus for controlling output power of a device in a multi-slot wireless communication system, comprising: 
 a device for providing a first power value at a first time point in a first slot and a second power value at a second time point in a second slot, wherein the second slot is adjacent to the first slot;    a memory for providing at least one original power curve;    a curve generator for generating an output power curve according to the original power curve between the first time point and the second time point, wherein at least one power value of the output power curve is substantially less than the first power value and the second power value; and    a controller for adjusting the output power according to the output power curve.    
     
     
         5 . The apparatus of  claim 4 , wherein the original power curve comprises a polynomial function.  
     
     
         6 . The apparatus of  claim 4 , wherein the original power curve comprises a first power curve FL(t) and a second power curve FR(t) and the output power curve comprises a first portion FL′(t) scaled into SL′*FL(t) and a second portion FR′(t) scaled into SR′*FR(t), wherein SL′=the first power value minus H and SR′=the second power value minus H.  
     
     
         7 . The apparatus of  claim 6 , wherein each of said first power curve FL(t) and said second power curve FR(t) comprises a plurality of original sections, each of which corresponds to a transmission power value.  
     
     
         8 . The apparatus of  claim 4 , wherein the device comprises a transmission power amplifier of a mobile phone.  
     
     
         9 . The apparatus of  claim 4 , wherein the apparatus comprises a coprocessor.  
     
     
         10 . The apparatus of  claim 4 , further comprising the transmission power amplifier.  
     
     
         11 . The apparatus of  claim 4 , wherein the curve generator comprises a coprocessor.  
     
     
         12 . The apparatus of  claim 4 , wherein the original power curve is divided horizontally into an original left section and an original right section.  
     
     
         13 . The apparatus of  claim 12 , wherein the original power curve is divided equally into said original left section and said original right section.  
     
     
         14 . A multi-slot wireless communication system, comprising: 
 a remote end; and    a mobile unit, communicating with the remote end by a plurality of slots, comprising:    a transmission power amplifier;    a device for providing a first power value at a first time point in a first slot and a second power value at a second time point in a second slot, wherein the second slot is adjacent to the first slot;    a memory for providing at least one original power curve;    a curve generator, receiving information from the device and the memory, for generating an output power curve according to the original power curve between the first time point and the second time point, wherein at least one power value of the output power curve is substantially less than the first power value and the second power value; and    a controller, receiving the output power curve from the curve generator and controlling the transmission power amplifier, for adjusting the output power of the transmission power amplifier according to the output power curve.    
     
     
         15 . The multi-slot wireless communication system of  claim 14 , wherein the multi-slot wireless communication system comprises a TDMA communication system.  
     
     
         16 . The multi-slot wireless communication system of  claim 14 , wherein the first power value in the first slot and the second power value in the second slot are different.  
     
     
         17 . A mobile phone, comprising the apparatus of  claim 1.