Low-Complexity Diversity Reception

Abstract

A system may comprise a plurality of signal processing paths, a bin-wise combiner, an inverse transformation block, and a DAC. Each signal processing path may comprise a transformation block that is operable to transform a first time-domain digital signal to an associated frequency-domain signal having a plurality of subband signals. The bin-wise combiner may be operable to combine corresponding subband signals of the plurality of signal processing paths. The inverse transformation block may be operable to transform output of the bin-wise combiner to an second time-domain signal. The DAC may be operable to converts the second time-domain signal to a corresponding analog signal.

What is claimed is: 
     
         1 . A method comprising:
 performing by circuitry of an electronic receiver:
 receiving a first signal via a first antenna of said electronic receiver; 
 transforming said first signal into a plurality of subbands comprising at least a first subband and a second subband; 
 receiving a second signal via a second antenna of said electronic receiver; 
 transforming said second signal into a plurality of subbands comprising at least said first subband and a second subband; 
 cophasing and combining said first subband of said first signal and said first subband of said second signal to generate a first subband of a combined signal; and 
 cophasing and combining said second subband of said first signal and said second subband of said second signal to generate a second subband of a combined signal. 
   
     
     
         2 . The method of  claim 1 , comprising equalizing said first signal and said second signal, wherein said equalizing is prior to said cophasing and combining said first subband of said first signal and said first subband of second signal, and prior to said cophasing and combining said second subband of said first signal and said second subband of second signal. 
     
     
         3 . The method of  claim 2 , comprising:
 as part of said equalizing said first signal, multiplying said plurality of subbands of said first signal with a first complex channel.   
     
     
         4 . The method of  claim 3 , comprising:
 determining said first complex channel by interpolating pilot tones dispersed within said first signal.   
     
     
         5 . The method of  claim 4 , comprising:
 as part of said equalizing said second signal, multiplying said plurality of subbands of said second signal with a second complex channel.   
     
     
         6 . The method of  claim 5 , comprising:
 determining said second complex channel by interpolating pilot tones dispersed within said second signal.   
     
     
         7 . The method of  claim 1 , comprising determining signal strength information for said plurality of subbands of said first signal based on relative amplitude of said plurality of subbands of said first signal and information about a gain applied to said first signal. 
     
     
         8 . The method of  claim 7 , comprising determining signal strength information for said plurality of subbands of said second signal based on relative amplitude of said plurality of subbands of said second signal and information about a gain applied to said second signal. 
     
     
         9 . The method of  claim 1 , wherein said combining said first subband of said first signal and said first subband of said second signal comprises correlating said first subband of said first signal with said first subband of said second signal. 
     
     
         10 . The method of  claim 9 , wherein said combining comprises: summing signals resulting from said bin-wise correlating. 
     
     
         11 . A system comprising:
 circuitry of an electronic receiver comprising a first antenna, a second antenna, and a combiner circuit, wherein said circuitry is operable to:
 receive, via said first antenna, a first signal; 
 transform said first signal into a plurality of subbands comprising at least a first subband and a second subband; 
 receive, via said second antenna, a second signal; 
 transform said second signal into a plurality of subbands comprising at least said first subband and a second subband; 
 cophase and combine, in said combiner circuit, said first subband of said first signal and said first subband of said second signal to generate a first subband of a combined signal; and 
 cophase and combine, in said combiner circuit, said second subband of first signal and said second subband of second signal to generate a second subband of a combined signal. 
   
     
     
         12 . The system of  claim 11 , comprising equalization circuitry operable to equalize said first signal and said second signal, wherein said equalization is prior to said cophasing and combining said first subband of said first signal and said first subband of second signal, and prior to said cophasing and combining said second subband of said first signal and said second subband of second signal. 
     
     
         13 . The system of  claim 12 , wherein said circuitry is operable to, as part of said equalization of said first signal, multiply said plurality of subbands of said first signal with a first complex channel. 
     
     
         14 . The system of  claim 13 , wherein said circuitry is operable to determine said first complex channel through interpolation of pilot tones dispersed within said first signal. 
     
     
         15 . The system of  claim 14 , wherein said circuitry is operable to, as part of said equalization of said second signal, multiply said plurality of subbands of said second signal with a second complex channel. 
     
     
         16 . The system of  claim 15 , wherein said circuitry is operable to determine said second complex channel through interpolation of pilot tones dispersed within said second signal. 
     
     
         17 . The system of  claim 11 , wherein said circuitry is operable to determine signal strength information for said plurality of subbands of said first signal based on relative amplitude of said plurality of subbands of said first signal and information about a gain applied to said first signal. 
     
     
         18 . The system of  claim 17 , wherein said circuitry is operable to determine signal strength information for said plurality of subbands of said second signal based on relative amplitude of said plurality of subbands of said second signal and information about a gain applied to said second signal. 
     
     
         19 . The system of  claim 11 , wherein said combining of said first subband of said first signal and said first subband of said second signal comprising correlation of said first subband of said first signal with said first subband of said second signal. 
     
     
         20 . The system of  claim 19 , wherein said combining comprises:
 summing signals resulting from said bin-wise correlating.