Multi-Band Observation Receiver

Abstract

Transmitter observation receivers and methods are described that can predistortion-compensate transmitters capable of operating in multiple communication bands and frequency ranges. Such observation receivers and method involve generating at least one compensation signal such that a signal to be transmitted that is within a bandwidth that simultaneously encompasses multiple frequency ranges is compensated.

What is claimed is: 
     
         1 . An arrangement for a pre-distortion-compensated transmitter for a communication system, comprising:
 an electronic processor circuit configured for converting a base-band signal to be transmitted to a spectrally shifted, pre-distorted signal to be transmitted based on at least one compensation signal;   a power amplifier configured for generating an amplified version of the spectrally shifted, pre-distorted signal to be transmitted, wherein the amplified version is in one frequency range of a plurality of frequency ranges used in the communication system;   a coupler configured for generating a sample signal from the amplified version; and   a transmitter observation receiver (TOR) configured for receiving the sample signal and generating at least one compensation signal based on the sample signal;   wherein the at least one compensation signal is generated such that a signal to be transmitted that is within a bandwidth that simultaneously encompasses multiple frequency ranges is compensated, and the electronic processor circuit converts the base-band signal to be transmitted such that a relationship between the base-band signal to be transmitted and the sample signal is substantially linear with constant phase.   
     
     
         2 . The arrangement of  claim 1 , wherein the TOR includes a wideband analog-to-digital converter (ADC) configured for converting the sample signal into a digital sample signal, and at least one digital down-converter configured for generating the at least one compensation signal; and the electronic processor circuit converts the base-band signal to be transmitted such that a relationship between the base-band signal to be transmitted and the sample signal is substantially linear with constant phase. 
     
     
         3 . The arrangement of  claim 2 , wherein the TOR includes a plurality of digital down-converters, each of which is optimized for a respective frequency range in the plurality of frequency ranges. 
     
     
         4 . The arrangement of  claim 3 , wherein each frequency range correspond to a respective one of a plurality of communication bands. 
     
     
         5 . The arrangement of  claim 1 , wherein the TOR is configured for tuning to different frequency ranges in the bandwidth by selectively adjusting at least one tuning component of the TOR. 
     
     
         6 . A method of pre-distortion-compensating a signal to be transmitted for a communication system, comprising:
 converting a base-band signal to be transmitted to a spectrally shifted, pre-distorted signal to be transmitted based on at least one compensation signal;   generating an amplified version of the spectrally shifted, pre-distorted signal to be transmitted, wherein the amplified version is in one communication band of a plurality of communication bands used in the communication system;   generating a sample signal from the amplified version; and   generating the at least one compensation signal based on the sample signal such that a signal to be transmitted that is within a bandwidth that simultaneously encompasses multiple frequency ranges is compensated;   wherein the base-band signal is converted such that a relationship between the base-band signal to be transmitted and the sample signal is substantially linear with constant phase.   
     
     
         7 . The method  claim 6 , wherein generating the at least one compensation signal includes converting the sample signal into a digital sample signal, and generating the at least one compensation signal based on the digital sample signal; and the base-band signal to be transmitted is converted such that a relationship between the base-band signal to be transmitted and the sample signal is substantially linear with constant phase. 
     
     
         8 . The method of  claim 6 , wherein generating the at least one compensation signal includes generating a plurality of compensation signals, each of which is optimized for a respective frequency range in the plurality of frequency ranges. 
     
     
         9 . The method of  claim 8 , wherein each frequency range corresponds to a respective one of a plurality of communication bands. 
     
     
         10 . The method of  claim 6 , wherein generating the at least one compensation signal includes tuning to different frequency ranges in the bandwidth by selecting at least one tuning component.