Low-complexity diversity reception
View Patent ↗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.
1. A method comprising:
performing by circuitry of an electronic receiver:
receiving a first version of a signal via a first antenna of said electronic receiver;
dividing said first version of said signal into a plurality of subbands comprising at least a first subband and a second subband;
receiving a second version of said signal via a second antenna of said electronic receiver;
dividing said second version of said 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 version of said signal and said first subband of said second version of said signal to generate a first subband of a combined signal; and
cophasing and combining said second subband of said first version of said signal and said second subband of said second version of said signal to generate a second subband of a combined signal.
2. The method of claim 1 , comprising equalizing said first version of said signal and said second version of said signal, wherein said equalizing is prior to said cophasing and combining said first subband of said first version of said signal and said first subband of second version of said signal, and prior to said cophasing and combining said second subband of said first version of said signal and said second subband of second version of said signal.
3. The method of claim 2 , comprising:
as part of said equalizing said first version of said signal, multiplying said plurality of subbands of said first version of said 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 version of said signal.
5. The method of claim 4 , comprising:
as part of said equalizing said second version of said signal, multiplying said plurality of subbands of said second version of said 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 version of said signal.
7. The method of claim 1 , comprising determining signal strength information for said plurality of subbands of said first version of said signal based on relative amplitude of said plurality of subbands of said first version of said signal and information about a gain applied to said first version of said signal.
8. The method of claim 7 , comprising determining signal strength information for said plurality of subbands of said second version of said signal based on relative amplitude of said plurality of subbands of said second version of said signal and information about a gain applied to said second version of said signal.
9. The method of claim 1 , wherein said combining said first subband of said first version of said signal and said first subband of said second version of said signal comprises correlating said first subband of said first version of said signal with said first subband of said second version of said 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 version of a signal;
divide said first version of said signal into a plurality of subbands comprising at least a first subband and a second subband;
receive, via said second antenna, a second version of said signal;
divide said second version of said 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 version of said signal and said first subband of said second version of said signal to generate a first subband of a combined signal; and
cophase and combine, in said combiner circuit, said second subband of first version of said signal and said second subband of second version of said signal to generate a second subband of a combined signal.
12. The system of claim 11 , comprising equalization circuitry operable to equalize said first version of said signal and said second version of said signal, wherein said equalization is prior to said cophasing and combining said first subband of said first version of said signal and said first subband of second version of said signal, and prior to said cophasing and combining said second subband of said first version of said signal and said second subband of second version of said signal.
13. The system of claim 12 , wherein said circuitry is operable to, as part of said equalization of said first version of said signal, multiply said plurality of subbands of said first version of said 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 version of said signal.
15. The system of claim 14 , wherein said circuitry is operable to, as part of said equalization of said second version of said signal, multiply said plurality of subbands of said second version of said 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 version of said 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 version of said signal based on relative amplitude of said plurality of subbands of said first version of said signal and information about a gain applied to said first version of said 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 version of said signal based on relative amplitude of said plurality of subbands of said second version of said signal and information about a gain applied to said second version of said signal.
19. The system of claim 11 , wherein said combining of said first subband of said first version of said signal and said first subband of said second version of said signal comprising correlation of said first subband of said first version of said signal with said first subband of said second version of said signal.
20. The system of claim 19 , wherein said combining comprises:
summing signals resulting from said bin-wise correlating.