Equalization of receiver

Patent metadata

Field	Value
Publication number	US-10348345-B2
Application number	US-201715410427-A
Country	US
Kind code	B2
Filing date	Jan 19, 2017
Priority date	Jan 19, 2016
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

Methods and systems for equalization of a first receiver. A method may include receiving an input signal at the first receiver. The method may also include receiving the input signal at a second receiver. The method may further include determining, from an output response of the second receiver, an estimate of an out-of-channel interferer present in the input signal. The method may also include determining an estimate, of an undesired in-channel response of the first receiver to the out-of-channel interferer present in the input signal. The method may include applying the estimate, of the undesired in-channel response of the first receiver to the out-of-channel interferer present in the input signal, to an output signal of the first receiver to substantially cancel an instance of an undesired in-channel response of the first receiver to the out-of-channel interferer.

First claim

What is claimed is:

1. A method for equalization of a first receiver, the method comprising:
receiving an input signal at the first receiver wherein the first receiver is a narrowband receiver configured to receive signals in a first channel;
receiving the input signal at a second receiver wherein the second receiver is a wideband receiver configured to receive a wider signal range than the narrowband receiver including at least a portion of the first channel and at least a portion of a second channel;
determining, from an output response of the second receiver, an estimate of an out-of-channel interferer present in the input signal wherein the out of channel interferer is outside the first channel and inside the at least the portion of the second channel;
determining an estimate, of an undesired in-channel response of the first receiver to the out-of-channel interferer outside the first channel and inside the at least the portion of the second channel and present in the input signal, based on a predetermined model, wherein the undesired in-channel response of the first receiver is in the first channel; and
applying the estimate, of the undesired in-channel response of the first receiver in the first channel to the out-of-channel interferer outside the first channel and inside the at least the portion of the second channel and present in the input signal, to an output signal of the first receiver, to substantially cancel an instance of an undesired in-channel response, of the first receiver in the first channel, to the out-of-channel interferer outside the first channel and inside the at least the portion of the second channel and present in the input signal.

2. The method of claim 1 , wherein the wideband receiver is configured to receive a plurality of narrowband channels.

3. The method of claim 1 , wherein the wideband receiver comprises a plurality of narrowband receivers.

4. The method of claim 1 , wherein determining the estimate, of the undesired in-channel response of the first receiver to the out-of-channel interferer present in the input signal, based on the predetermined model, is performed at a signal processing module in communication with the second receiver and the first receiver.

5. A system for equalization of a first receiver, the system comprising:
the first receiver wherein the first receiver is a narrowband receiver configured to receive signals in a first channel;
a second receiver wherein the second receiver is a wideband receiver configured to receive a wider signal range than the narrowband receiver including at least a portion of the first channel and at least a portion of a second channel; and
a signal processing module in communication with the second receiver and the first receiver, the signal processing module configured to:
determine, from an output signal generated by the second receiver, an estimate of an out-of-channel interferer present in an input signal of the first receiver wherein the out of channel interferer is outside the first channel and inside the at least the portion of the second channel;
estimate, an undesired in-channel response of the first receiver to the out-of-channel interferer outside the first channel and inside the at least the portion of the second channel and present in the input signal, based on a pre-determined model, wherein the undesired in-channel response of the first receiver is in the first channel; and
apply the estimate, of the undesired in-channel response of the first receiver in the first channel to the out-of-channel interferer outside the first channel and inside the at least the portion of the second channel and present in the input signal, to an output signal of the first receiver, to substantially cancel an instance of an undesired in-channel response, of the first receiver in the first channel, to the out-of-channel interferer outside the first channel and inside the at least the portion of the second channel and present in the input signal.

6. The system of claim 5 , wherein the wideband receiver is configured to receive a plurality of narrowband channels.

7. The system of claim 5 , wherein the wideband receiver comprises a plurality of narrowband receivers.

8. A method of calibrating a system for equalization of a first receiver, the method comprising:
applying a multi-tone input signal to the first receiver wherein the first receiver is a narrowband receiver configured to receive signals in a first channel;
applying the multi-tone input signal to a second receiver wherein the second receiver is a wideband receiver configured to receive a wider signal range than the narrowband receiver including at least a portion of the first channel and at least a portion of a second channel;
determining amplitudes of tones at intermodulation frequencies from an output of the first receiver;
determining amplitudes of tones at input frequencies from an output of the second receiver; and
mapping the amplitudes of the tones at the intermodulation frequencies determined from the output of the first receiver to the amplitudes of the tones at the input frequencies determined from the output of the second receiver.

9. The method of claim 8 , further comprising:
applying the mapping to achieve equalization of the first receiver.

10. The method of claim 8 , further, comprising:
applying the mapping to achieve wideband equalization of the narrowband receiver.

Assignees

• Guyton Matthew C
• Wang Xiao
• Massachusetts Inst Technology

Inventors

• Guyton Matthew C
• Wang Xiao

Classifications

• H04L25/03019 Primary

  adaptive, i.e. capable of adjustment during data reception · CPC title

• H04L27/01

  Equalisers {(baseband equalizers at the transmitter end H04L25/03343; in analogue transmission systems H04B3/04, H04B7/005)} · CPC title

• H04B7/005

  Control of transmission; Equalising · CPC title

• H04B1/1036 Primary

  with automatic suppression of narrow band noise or interference, e.g. by using tuneable notch filters (H04B1/123 takes precedence; filter circuits H03H) · CPC title

• H04L27/22

  Demodulator circuits; Receiver circuits · CPC title