Receiver including a plurality of high-pass filters

Patent metadata

Field	Value
Publication number	US-10044534-B2
Application number	US-201715591895-A
Country	US
Kind code	B2
Filing date	May 10, 2017
Priority date	May 11, 2016
Publication date	Aug 7, 2018
Grant date	Aug 7, 2018

Abstract

Embodiments described herein include a receiver, a method, and a plurality of high-pass filters for demodulating a radio frequency (RF) signal. An example receiver includes a plurality of high-pass filters. The receiver includes a demodulator configured to demodulate an RF signal received at an input of the demodulator and configured to output a demodulated signal. The receiver also includes a plurality of high-pass filters connected to an output of the demodulator. The plurality of high-pass filters are configured to receive the demodulated signal and configured to high-pass filter the demodulated signal. The plurality of high-pass filters are configured to operate with a first set of filter responses during a first time period of the demodulated signal and configured to operate with a second set of filter responses during a second time period of the demodulated signal.

First claim

What is claimed is:

1. A receiver comprising:
a demodulator configured to demodulate a radio frequency (RF) signal received at an input of the demodulator and configured to output a demodulated signal; and
a plurality of high-pass filters connected to an output of the demodulator,
wherein the plurality of high-pass filters are configured to receive the demodulated signal and configured to high-pass filter the demodulated signal,
wherein the plurality of high-pass filters are configured to operate with a first set of filter responses during a first time period of the demodulated signal and configured to operate with a second set of filter responses during a second time period of the demodulated signal,
wherein the receiver is configured to receive the RF signal as a modulated carrier signal with a predetermined carrier frequency, and
wherein the demodulator is configured to demodulate a carrier frequency offset (CFO) present in the RF signal into a DC offset.

2. The receiver according to claim 1 ,
wherein each filter response in the first set of filter responses has a corresponding filter response in the second set of filter responses, and
wherein each of the corresponding filter responses in the second set of filter responses is slower than the corresponding first filter response.

3. The receiver according to claim 1 , wherein at least one of the high-pass filters comprises electronic circuitry, a portion of computer program code, or a mix of electronic circuitry and a portion of computer program code.

4. The receiver according to claim 3 , further comprising a selector configured to select one of the plurality of high-pass filters based on the CFO.

5. The receiver according to claim 1 , wherein the demodulator is a differential phase-domain demodulator.

6. The receiver according to claim 1 , wherein the demodulated signal is a data packet.

7. The receiver according to claim 6 , wherein the plurality of high-pass filters are configured to operate with the first set of filter responses on a first part of the data packet and with the second set of filter responses on a second part of the data packet.

8. The receiver according to claim 1 , further comprising a buffer connected to the output of the demodulator for buffering at least a portion of the demodulated signal.

9. The receiver according to claim 8 , further comprising a comparator connected to the output of the demodulator and an output of the high-pass filters, wherein the comparator is configured to provide a correction signal to an input of the buffer based on a difference between the demodulated signal and a filtered demodulated signal.

10. A method for processing a received signal comprising a modulated carrier signal of a predetermined carrier frequency, wherein the modulated carrier signal comprises a carrier frequency offset (CFO), and wherein the method comprises:
demodulating the received signal into a demodulated signal;
receiving the demodulated signal in a plurality of high-pass filters;
high-pass filtering the demodulated signal using a first set of filter responses for the plurality of high-pass filters during a first time period of the demodulated signal and high-pass filtering the demodulated signal using a second set of filter responses for the plurality of high-pass filters during a second time period of the demodulated signal;
receiving a radio frequency (RF) signal as the modulated carrier signal with the predetermined carrier frequency; and
demodulating the CFO present in the RF signal into a DC offset.

11. The method according to claim 10 , wherein each filter response in the first set of filter responses has a corresponding filter response in the second set of filter responses, and wherein each of the corresponding filter responses in the second set of filter responses is slower than the corresponding first filter response.

12. The method according to claim 10 , wherein at least one of the high-pass filters comprises electronic circuitry, a portion of computer program code, or a mix of electronic circuitry and a portion of computer program code.

13. The method according to claim 12 , further comprising selecting one of the plurality of high-pass filters based on the CFO.

14. The method according to claim 10 , further comprising:
buffering at least a portion of the demodulated signal; and
correcting the buffered portion based on a difference between the demodulated signal and the high-pass filtered demodulated signal.

15. A plurality of high-pass filters,
wherein the plurality of high-pass filters are configured to be connected to an output of a demodulator,
wherein the demodulator is configured to demodulate a radio frequency (RF) signal received at an input of the demodulator and configured to output a demodulated signal,
wherein the plurality of high-pass filters are configured to receive the demodulated signal and configured to high-pass filter the demodulated signal,
wherein the plurality of high-pass filters are configured to operate with a first set of filter responses during a first time period of the demodulated signal and configured to operate with a second set of filter responses during a second time period of the demodulated signal,
wherein the demodulator is configured to receive the RF signal as a modulated carrier signal with a predetermined carrier frequency, and
wherein the demodulator is configured to demodulate a carrier frequency offset (CFO) present in the RF signal into a DC offset.

16. The plurality of high-pass filters according to claim 15 ,
wherein each filter response in the first set of filter responses has a corresponding filter response in the second set of filter responses, and
wherein each of the corresponding filter responses in the second set of filter responses is slower than the corresponding first filter response.

17. The plurality of high-pass filters according to claim 15 , wherein the demodulator is a differential phase-domain demodulator.

18. The plurality of high-pass filters according to claim 15 , wherein the demodulated signal is a data packet.

19. The plurality of high-pass filters according to claim 18 , wherein the plurality of high-pass filters are configured to operate with the first set of filter responses on a first part of the data packet and with the second set of filter responses on a second part of the data packet.

20. The plurality of high-pass filters according to claim 15 , wherein the output of the demodulator is connected to a buffer for buffering at least a portion of the demodulated signal.

Assignees

• Stichting Imec Nederland

Inventors

• Van Den Heuvel Johan

Classifications

• H04B1/00

  Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission · CPC title

• H04L27/16

  Frequency regulation arrangements · CPC title

• H04L27/227

  using coherent demodulation · CPC title

• H04L27/148

  using filters, including PLL-type filters · CPC title

• H04L1/206

  for modulated signals · CPC title