Increasing ADC dynamic range by time domain selective cancellation of predictable large PAPR signals
Increasing an analog to digital converter (ADC) dynamic range for a communications device. In the communications device, a reference threshold is established for a peak to average power ratio (PAPR) improvement factor for RF signals received by the communications device. A digital to analog converter (DAC) adjustment factor is established for a DAC to account for inaccuracies of a pre-cancellation DAC and fine tuning of an analog gain of received RF signals. A peak amplitude separation element evaluates an absolute value of a portion of a particular RF signal against the reference threshold. Upon the peak amplitude separation element determining that the portion is smaller than the reference threshold, the element assigns a zero value to a DAC signal current sample; otherwise, the element assigns a quantized value of the sample to the DAC signal current sample, used in adjusting a post-cancellation signal sample.
1. One or more non-transitory computer-readable storage mediums storing one or more sequences of instructions for increasing an analog to digital converter (ADC) dynamic range for a communications device, which when executed by one or more processors, cause:
in the communications device, establishing a reference threshold for a peak to average power ratio (PAPR) improvement factor for RF signals received by the communications device;
a peak amplitude separation element evaluating an absolute value of a portion of a particular RF signal against said reference threshold;
upon the peak amplitude separation element determining that the portion is smaller than said reference threshold, the peak amplitude separation element assigning a zero value to a DAC signal current sample; and
upon the peak amplitude separation element determining that the portion is larger or equal to said reference threshold, the peak amplitude separation element assigning a quantized value of the sample to the DAC signal current sample.
2. The one or more non-transitory computer-readable storage mediums of claim 1 , wherein the communications device is deployed in a Cable Television (CATV) system.
3. The one or more non-transitory computer-readable storage mediums of claim 1 , wherein the communications device performs full duplex (FDX) Data Over Cable Service Interface Specifications (DOCSIS) operations.
4. The one or more non-transitory computer-readable storage mediums of claim 1 , wherein the communications device is a point-to-point wireless link.
5. The one or more non-transitory computer-readable storage mediums of claim 1 , wherein the communications device is a cellular backhaul.
6. The one or more non-transitory computer-readable storage mediums of claim 1 , wherein the communications device is a Wi-Fi repeater.
7. An apparatus for increasing an analog to digital converter (ADC) dynamic range for a communications device, comprising:
one or more processors; and
one or more non-transitory computer-readable storage mediums storing one or more sequences of instructions, which when executed, cause:
in the communications device, establishing a reference threshold for a peak to average power ratio (PAPR) improvement factor for RF signals received by the communications device;
a peak amplitude separation element evaluating an absolute value of a portion of a particular RF signal against said reference threshold;
upon the peak amplitude separation element determining that the portion is smaller than said reference threshold, the peak amplitude separation element assigning a zero value to a DAC signal current sample; and
upon the peak amplitude separation element determining that the portion is larger or equal to said reference threshold, the peak amplitude separation element assigning a quantized value of the sample to the DAC signal current sample.
8. The apparatus of claim 7 , wherein the communications device is deployed in a Cable Television (CATV) system.
9. The one or more non-transitory computer-readable storage mediums of claim 7 , wherein the communications device performs full duplex (FDX) Data Over Cable Service Interface Specifications (DOCSIS) operations.
10. The one or more non-transitory computer-readable storage mediums of claim 7 , wherein the communications device is a point-to-point wireless link.
11. The one or more non-transitory computer-readable storage mediums of claim 7 , wherein the communications device is a cellular backhaul.
12. The one or more non-transitory computer-readable storage mediums of claim 7 , wherein the communications device is a Wi-Fi repeater.
13. The one or more non-transitory computer-readable storage mediums of claim 7 , wherein the apparatus is coupled to said communications device or exchanges signals with said communications device over a transmission medium, and said communications device is one or more of: a component in a Cable Television (CATV) system, a device performing full duplex (FDX) Data Over Cable Service Interface Specifications (DOCSIS) operations, a cellular backhaul, and a Wi-Fi repeater.
14. A method for increasing an analog to digital converter (ADC) dynamic range for a communications device, comprising:
in the communications device, establishing a reference threshold for a peak to average power ratio (PAPR) improvement factor for RF signals received by the communications device;
a peak amplitude separation element evaluating an absolute value of a portion of a particular RF signal against said reference threshold;
upon the peak amplitude separation element determining that the portion is smaller than said reference threshold, the peak amplitude separation element assigning a zero value to a DAC signal current sample; and
upon the peak amplitude separation element determining that the portion is larger or equal to said reference threshold, the peak amplitude separation element assigning a quantized value of the sample to the DAC signal current sample.
15. The method of claim 14 , wherein the communications device is deployed in a Cable Television (CATV) system.
16. The method of claim 14 , wherein the communications device performs full duplex (FDX) Data Over Cable Service Interface Specifications (DOCSIS) operations.
17. The method of claim 14 , wherein the communications device is a point-to-point wireless link.
18. The method of claim 14 , wherein the communications device is a cellular backhaul.
19. The method of claim 14 , wherein the communications device is a Wi-Fi repeater.
20. The method of claim 14 , wherein the apparatus is coupled to said communications device or exchanges signals with said communications device over a transmission medium, and said communications device is one or more of: a component in a Cable Television (CATV) system, a device performing full duplex (FDX) Data Over Cable Service Interface Specifications (DOCSIS) operations, a cellular backhaul, and a Wi-Fi repeater.