Wireless repeater with arbitrary programmable selectivity
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 repeater system configured for sampling, filtering, and repeating an RF signal, the system, comprising:
a digital signal processor (DSP) configured to receive the RF signal; and
a multi-sub bandpass filter configured to
receive and process sub bands with a plurality of tap weight coefficients,
use a coefficient of the tap weight coefficients to process a sub band of the sub bands at one or more time-shifted stages; and
use the one or more time-shifted stages to define a count indicative of a number of stages in the one or more time-shifted stages that is independent of a count descriptive of a number of the sub bands being processed concurrently by the multi-sub bandpass filter.
2. The system of claim 1 , wherein each of the tap weight coefficients has a bit width, the bit widths being sized based on a count of the plurality of bands being filtered.
3. The system of claim 2 , 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 sub bands being filtered plus 1.
4. The system of claim 2 , 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 sub bands being filtered.
5. The system of claim 1 , wherein the wireless transmission signal repeater is configured to sum an output of the one or more time-shifted stages, the summing being performed independent of the count of the sub bands.
6. The system of claim 5 , wherein the multi-sub bandpass filter is configured to concurrently process at least two sub bands of the RF signal.
7. The system of claim 1 , wherein the repeater system includes a digital filter in communication with the DSP and configured to process the sample with a plurality of composite filter coefficients, the composite filter coefficients being formed by summing coefficients for each of a plurality of bandpass filters.
8. The system of claim 1 , wherein the repeater system includes a Hilbert filter facility in communication with the DSP and configured to produce an output additional to and in quadrature with an output of the multi-sub bandpass filter.
9. The system of claim 1 , wherein the repeater system includes an image noise filter in communication with the DSP and configured to pass a desired downlink band and reject out-of-band noise of the signal.
10. The system of claim 1 , wherein the repeater system includes a simplified frequency architecture in communication with the DSP, the simplified frequency architecture being configured to exhibit substantial end-for-end symmetry.
11. The system of claim 1 , wherein the repeater system includes a cancellation circuit in communication with the DSP and configured to adaptively cancel signal leakage.
12. The system of claim 11 , wherein the repeater system includes a nulling digital processor, a downlink coverage downconverter, an uplink donor downconverter, and a directional coupler, the nulling digital processor, the downlink coverage downconverter, the uplink donor downconverter, and the directional coupler being in communication with the DSP.
13. A method of sampling, filtering, and repeating an RF signal including a plurality of sub bands, comprising:
receiving, by a digital signal processor (DSP), the RF signal;
receiving and processing, by a multi-sub bandpass filter, the sub bands with a plurality of tap weight coefficients;
concurrently processing, by the multi-sub bandpass filter, the sub bands;
processing, by the multi-sub bandpass filter, a sub band of the sub bands at each of a plurality of time-shifted stages using a coefficient of the tap weight coefficients;
wherein the plurality of time-shifted stages define a count, the count being indicative of a number of stages in the plurality of time-shifted stages that is independent of a count descriptive of a number of sub bands being processed by the multi-sub bandpass filter.
14. The method of claim 13 , wherein the tap weight coefficients have bit widths that are sized based on the count descriptive of a number of bands in the plurality of bands.
15. The method of claim 14 , 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 the count descriptive of a number of bands in the plurality of bands plus 1.
16. The method of claim 14 , 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 the count descriptive of a number of bands in the plurality of bands.
17. The method of claim 13 , further comprising summing, by the multi-sub bandpass filter, an output of each of the plurality of time-shifted stages independent of the count descriptive of a number of bands in the plurality of bands.
18. The method of claim 17 , further comprising concurrently processing, by the multi-sub bandpass filter, at least two bands of the RF signal.
19. The method of claim 13 , further comprising processing, by a digital filter, the sample with a plurality of composite filter coefficients formed by summing coefficients for each of a plurality of bandpass filters.
20. The method of claim 13 , further comprising adaptively cancelling, by a cancellation circuit, signal leakage.