Analog self-interference cancellation systems for CMTS
First Claim
1. A system for wired analog self-interference cancellation comprising:
- a transmit coupler, communicatively coupled to a radio frequency (RF) transmit signal of a wired communication system, that samples the RF transmit signal to create a sampled RF transmit signal having an RF carrier frequency;
an analog-self-interference canceller comprising;
a first coarse delayer that delays the sampled RF transmit signal by a first delay amount, resulting in a delayed sampled RF transmit signal;
wherein the first coarse delayer delays the sampled RF transmit signal prior to frequency downconversion;
a frequency downconverter, comprising a mixer, a local oscillator, and an intermediate frequency (IF) filter, wherein the frequency downconverter converts, by heterodyning, the delayed sampled RF transmit signal to a delayed sampled IF transmit signal having an IF carrier frequency, wherein the IF carrier frequency is less than the RF carrier frequency; and
a first canceller tap group comprising a first per-tap-group delayer, a first sampling coupler, a first per-tap delayer, first and second analog vector modulators, and a first combining coupler;
wherein the first per-tap-group delayer further delays the delayed sampled IF transmit signal;
wherein the first sampling coupler splits the delayed sampled IF transmit signal, after the first per-tap-group delayer, into first and second IF transmit signal components;
wherein the first analog vector modulator generates a first IF self-interference cancellation signal component from the first IF transmit signal component;
wherein the first per-tap delayer delays the second IF transmit signal component, resulting in a delayed second IF transmit signal component;
wherein the second analog vector modulator generates a second IF self-interference cancellation signal component from the delayed second IF transmit signal component;
wherein the first combining coupler combines the first and second IF self-interference cancellation signal components to generate an IF self-interference cancellation signal;
a frequency upconverter comprising a mixer, a local oscillator, and an RF filter, wherein the frequency upconverter converts, by heterodyning, the IF self-interference cancellation signal to an RF self-interference cancellation signal having the RF carrier frequency; and
a receive coupler, communicatively coupled to an RF receive signal of the wired communication system, that combines the RF self-interference cancellation signal with the RF receive signal, resulting in an RF composite receive signal;
wherein the RF composite receive signal contains less self-interference than the RF receive signal.
5 Assignments
0 Petitions
Accused Products
Abstract
A system for wired analog self-interference cancellation includes a coarse delayer that delays a sampled RF transmit signal by a first delay amount; a frequency downconverter that downconverts the sampled RF transmit signal to IF; a first canceller tap group comprising a first per-tap-group delayer, a first sampling coupler, a first per-tap delayer, and first and second analog vector modulators that generates an IF self-interference cancellation signal; a frequency upconverter that upconverts the IF self-interference cancellation signal to RF; and a receive coupler that combines the RF self-interference cancellation signal with the RF receive signal, reducing self-interference.
-
Citations
20 Claims
-
1. A system for wired analog self-interference cancellation comprising:
-
a transmit coupler, communicatively coupled to a radio frequency (RF) transmit signal of a wired communication system, that samples the RF transmit signal to create a sampled RF transmit signal having an RF carrier frequency; an analog-self-interference canceller comprising; a first coarse delayer that delays the sampled RF transmit signal by a first delay amount, resulting in a delayed sampled RF transmit signal;
wherein the first coarse delayer delays the sampled RF transmit signal prior to frequency downconversion;a frequency downconverter, comprising a mixer, a local oscillator, and an intermediate frequency (IF) filter, wherein the frequency downconverter converts, by heterodyning, the delayed sampled RF transmit signal to a delayed sampled IF transmit signal having an IF carrier frequency, wherein the IF carrier frequency is less than the RF carrier frequency; and a first canceller tap group comprising a first per-tap-group delayer, a first sampling coupler, a first per-tap delayer, first and second analog vector modulators, and a first combining coupler;
wherein the first per-tap-group delayer further delays the delayed sampled IF transmit signal;
wherein the first sampling coupler splits the delayed sampled IF transmit signal, after the first per-tap-group delayer, into first and second IF transmit signal components;
wherein the first analog vector modulator generates a first IF self-interference cancellation signal component from the first IF transmit signal component;
wherein the first per-tap delayer delays the second IF transmit signal component, resulting in a delayed second IF transmit signal component;
wherein the second analog vector modulator generates a second IF self-interference cancellation signal component from the delayed second IF transmit signal component;
wherein the first combining coupler combines the first and second IF self-interference cancellation signal components to generate an IF self-interference cancellation signal;a frequency upconverter comprising a mixer, a local oscillator, and an RF filter, wherein the frequency upconverter converts, by heterodyning, the IF self-interference cancellation signal to an RF self-interference cancellation signal having the RF carrier frequency; and a receive coupler, communicatively coupled to an RF receive signal of the wired communication system, that combines the RF self-interference cancellation signal with the RF receive signal, resulting in an RF composite receive signal;
wherein the RF composite receive signal contains less self-interference than the RF receive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A system for wired analog self-interference cancellation comprising:
-
a transmit coupler, communicatively coupled to a radio frequency (RF) transmit signal of a wired communication system, that samples the RF transmit signal to create a sampled RF transmit signal having an RF carrier frequency; an analog-self-interference canceller comprising; a first coarse delayer that generates a first delayed sampled RF transmit signal by delaying the sampled RF transmit signal by a first delay amount and generates a second delayed sampled RF transmit signal by delaying the sampled RF transmit signal by a second delay amount;
wherein the second delay amount is greater than the first delay amount;
wherein the first coarse delayer generates delayed sampled RF transmit signals prior to frequency downconversion;a frequency downconverter, comprising a mixer, a local oscillator, and an intermediate frequency (IF) filter, wherein the frequency downconverter converts, by heterodyning, the first and second delayed sampled RF transmit signals to first and second delayed sampled IF transmit signals having an IF carrier frequency, wherein the IF carrier frequency is less than the RF carrier frequency; a first canceller tap group comprising a first per-tap-group delayer, a first sampling coupler, a first per-tap delayer, and first and second analog vector modulators;
wherein the first per-tap-group delayer further delays the first delayed sampled IF transmit signal;
wherein the first sampling coupler splits the first delayed sampled IF transmit signal, after the first per-tap-group delayer, into first and second IF transmit signal components;
wherein the first analog vector modulator generates a first IF self-interference cancellation signal component from the first IF transmit signal component;
wherein the first per-tap delayer delays the second IF transmit signal component, resulting in a delayed second IF transmit signal component;
wherein the second analog vector modulator generates a second IF self-interference cancellation signal component from the delayed second IF transmit signal component;a second canceller tap group comprising a second per-tap-group delayer, a second sampling coupler, a second per-tap delayer, and third and fourth analog vector modulators;
wherein the second per-tap-group delayer further delays the second delayed sampled IF transmit signal;
wherein the second sampling coupler splits the second delayed sampled IF transmit signal, after the second per-tap-group delayer, into third and fourth IF transmit signal components;
wherein the third analog vector modulator generates a third IF self-interference cancellation signal component from the third IF transmit signal component;
wherein the second per-tap delayer delays the fourth IF transmit signal component, resulting in a delayed fourth IF transmit signal component;
wherein the fourth analog vector modulator generates a fourth IF self-interference cancellation signal component from the delayed fourth IF transmit signal component; anda combining coupler that combines the first, second, third, and fourth IF self-interference cancellation signal components to generate an IF self-interference cancellation signal; a frequency upconverter comprising a mixer, a local oscillator, and an RF filter, wherein the frequency upconverter converts, by heterodyning, the IF self-interference cancellation signal to an RF self-interference cancellation signal having the RF carrier frequency; and a receive coupler, communicatively coupled to an RF receive signal of the wired communication system, that combines the RF self-interference cancellation signal with the RF receive signal, resulting in an RF composite receive signal;
wherein the RF composite receive signal contains less self-interference than the RF receive signal. - View Dependent Claims (12, 13, 14, 15)
-
-
16. A system for wired analog self-interference cancellation comprising:
-
a transmit coupler, communicatively coupled to a radio frequency (RF) transmit signal of a wired communication system, that samples the RF transmit signal to create a sampled RF transmit signal having an RF carrier frequency; an analog-self-interference canceller comprising; a frequency downconverter, comprising a mixer, a local oscillator, and an intermediate frequency (IF) filter, wherein the frequency downconverter converts, by heterodyning, the sampled RF transmit signal to a sampled IF transmit signal having an IF carrier frequency, wherein the IF carrier frequency is less than the RF carrier frequency; a sampling coupler that splits the sampled IF transmit signal into first and second sampled IF transmit signals; a first canceller tap group comprising a first per-tap-group delayer, a first sampling coupler, a first per-tap delayer, first and second analog vector modulators, and a first coupling combiner;
wherein the first per-tap-group delayer delays the first sampled IF transmit signal;
wherein the first sampling coupler splits the first sampled IF transmit signal, after the first per-tap-group delayer, into first and second IF transmit signal components;
wherein the first analog vector modulator generates a first IF self-interference cancellation signal component from the first IF transmit signal component;
wherein the first per-tap delayer delays the second IF transmit signal component, resulting in a delayed second IF transmit signal component;
wherein the second analog vector modulator generates a second IF self-interference cancellation signal component from the delayed second IF transmit signal component;
wherein the first combining coupler combines the first and second IF self-interference cancellation signal components to generate a first IF self-interference cancellation signal super-component;a second canceller tap group comprising a second per-tap-group delayer, a second sampling coupler, a second per-tap delayer, third and fourth analog vector modulators, and a second combining coupler;
wherein the second per-tap-group delayer delays the second sampled IF transmit signal;
wherein the second sampling coupler splits the second sampled IF transmit signal, after the second per-tap-group delayer, into third and fourth IF transmit signal components;
wherein the third analog vector modulator generates a third IF self-interference cancellation signal component from the third IF transmit signal component;
wherein the second per-tap delayer delays the fourth IF transmit signal component, resulting in a delayed fourth IF transmit signal component;
wherein the fourth analog vector modulator generates a fourth IF self-interference cancellation signal component from the delayed fourth IF transmit signal component;
wherein the second combining coupler combines the third and fourth IF self-interference cancellation signal components to generate a second IF self-interference cancellation signal super-component;a frequency upconverter comprising a mixer, a local oscillator, and an RF filter, wherein the frequency upconverter converts, by heterodyning, the first and second IF self-interference cancellation signal super-components to first and second RF self-interference cancellation signal super-components having the RF carrier frequency; and a first coarse delayer that delays the first RF self-interference cancellation signal super-component by a first delay amount, delays the second RF self-interference cancellation signal super-component by a second delay amount, and combines the first and second delayed RF self-interference cancellation signal super-components to generate an RF self-interference cancellation signal;
wherein the second delay amount is greater than the first delay amount; anda receive coupler, communicatively coupled to an RF receive signal of the wired communication system, that combines the RF self-interference cancellation signal with the RF receive signal, resulting in an RF composite receive signal;
wherein the RF composite receive signal contains less self-interference than the RF receive signal. - View Dependent Claims (17, 18, 19, 20)
-
Specification