Wireless repeater with arbitrary programmable selectivity
View Patent ↗The invention relates to wireless repeater systems and methods. In embodiments, such systems and methods involve receiving a wireless transmission signal; and processing the wireless transmission signal using a digital signal processing facility (DSP); wherein the DSP is adapted to filter at least one sub-band of the wireless transmission signal using a digital bandpass filter.
1. A method, comprising:
processing a signal received by a wireless signal repeater through a digital signal processor (DSP), the DSP concurrently processing a plurality of bands of the signal by using a multi-band filter system that processes a sample of the signal with a plurality of tap weight coefficients, the bit widths of which are sized based on a count of the plurality of bands being filtered, a different coefficient of the plurality of tap weight coefficients used to process the sample at each of a plurality of time-shifted stages, wherein a count of the stages is independent of a count of the plurality of bands.
2. The method of claim 1 wherein the bit widths of the filter tap coefficients are sized to include at least a count of bits that equals a base 2 logarithm of a count of pass bands being filtered plus 1.
3. The method of claim 1 wherein the bit widths of the filter tap coefficients are sized to include a single band count of bits plus a base 2 logarithm of a count of pass bands being filtered.
4. The method of claim 1 further comprising summing an output of each of the plurality of stages, wherein the summing is performed independent of the count of the plurality of bands.
5. The method of claim 4 wherein the multi-band filter processes at least two bands of the signal.
6. The method of claim 1 , wherein the repeater is a digital filter that comprises composite filter coefficients that are formed by summing coefficients for each sub-bandpass filter.
7. A method, comprising:
processing a signal received by a wireless signal repeater through a digital signal processor (DSP), the DSP concurrently processing a plurality of bands of the signal using a composite multi-sub-band bandpass filter adapted to process the plurality of bands by processing a sample of the signal with one of a plurality of tap weight coefficients at each of a plurality of time-shifted stages, the coefficients sized based on a count of the plurality of bands being filtered, wherein a count of the plurality of time-shifted stages is independent of a count of the plurality of bands; and
adaptively cancelling transmitter wrap-around leakage.
8. The method of claim 7 wherein the adaptively cancelling includes an adaptively weighted transmission sample.
9. The method of claim 7 further comprising providing an interface adapted to select at least one sub-band.
10. The method of claim 7 wherein the repeater includes filter tap weight coefficients with bit widths that are sized based on a count of the plurality of bands being filtered.
11. The method of claim 10 wherein the bit widths of the filter tap coefficients are sized to include at least a count of bits that equals a base 2 logarithm of a count of pass bands being filtered plus 1.
12. The method of claim 10 wherein the bit widths of the filter tap coefficients are sized to include a single band count of bits plus a base 2 logarithm of a count of pass bands being filtered.
13. The method of claim 12 wherein the repeater includes filter tap multipliers comprising bit widths that are sized based on a count of the plurality of bands being filtered.
14. The method of claim 7 , wherein the composite multi-sub-bandpass filter is a digital filter that comprises composite filter coefficients that are formed by summing coefficients for each sub-bandpass filter in the multi-sub-bandpass filter.
15. A system, comprising:
a cell phone transmission signal repeater that includes a digital multi-sub-band bandpass filter for concurrently digitally filtering a plurality of sub-bands of a composite multi-band signal;
a plurality of tap weight multipliers, wherein a count of the plurality of tap weight multipliers is independent of the count of the plurality of sub-bands; and
a plurality of filter tap coefficients with bit widths that are sized based on a count of the plurality of sub-bands of the composite multi-band signal.
16. The system of claim 15 wherein the bit widths of the filter tap coefficients are sized to include at least a count of bits that equals a base 2 logarithm of a count of pass bands being filtered plus 1.
17. The system of claim 15 wherein the bit widths of the filter tap coefficients are sized to include a single band count of bits plus a base 2 logarithm of a count of pass bands being filtered.
18. The system of claim 15 wherein the repeater processes any number of sub-bands of the signal with the FIR filter.
19. The system of claim 18 wherein the FIR filter processes at least two sub-bands of the plurality of sub-bands.