Carrier selection for multiple antennas

• US 9,112,481 B2
• Filed: 01/17/2014
• Issued: 08/18/2015
• Est. Priority Date: 06/15/2007
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Gaikwad, Rohit V.
• Primary Examiner(s): LEE, SIU M
• Application Number:
  US14/158,505
• Publication Number:
  US 20140133609A1
• Time in Patent Office: 578 Days
• Field of Search: 375/316, 375/343, 375/354, 375/355, 375/356
• US Class Current: 1/1
• CPC Class Codes: H03H 17/0294 Variable filters; Programmable filters
• CPC Class Codes: H04L 27/0002 analog front ends; means for connecting modulators, demodulators or transceivers to a transmission line duplex arrangements H04L5/143
• CPC Class Codes: H04L 7/046 using a dotting sequence

Abstract

A method and apparatus is disclosed to process a received single stream communication signal and/or a multiple stream communication. A communications receiver is configured to receive the received communication signal. A communications receiver determines whether the received communication signal includes a single stream communication signal or a multiple stream communication signal. The communications receiver determines whether a received communication signal complies with a known single stream communications standard. The communications receiver determines whether the received communication signal complies with a known multiple stream communications standard. The communications receiver decodes the received communication signal according to the known single stream communications standard upon determining the received communication includes the signal single stream communication signal. The communications receiver decodes the received communication signal according to the known multiple stream communications standard upon determining the received communication includes the multiple stream communication signal.

Claims

1. A resampler module, comprising:

a plurality of digital filters configured to produce a plurality of filtered communication signals, wherein a first digital filter in the plurality of digital filters is configured to;

receive a clock signal and a communication signal, and

produce a first filtered communication signal in the plurality of filtered communication signals based on the clock signal and the communication signal; and

a switch module coupled to the plurality of digital filters, wherein the switch module is configured to

select the first filtered communication signal for a duration of a sample of the first filtered communication signal, and

reduce a number of samples of the first filtered communication signal.

2. The resampler module of claim 1, wherein each digital filter in the plurality of digital filters is configured to produce a respective filtered communication signal in the plurality of filtered communication signals for each clock cycle of the clock signal.

3. The resampler module of claim 1, wherein the switch module is further configured to select a second filtered communication signal in the plurality of filtered communication signals for a duration of a sample of a second filtered communication signal produced by a second digital filter in the plurality of digital filters.

4. The resampler module of claim 1, wherein the switch module is configured to select the first filtered communication signal for the duration of the sample of the first filtered communication signal during a first state of the clock signal.

5. The resampler module of claim 4, wherein the switch module is further configured to hold the first filtered communication signal for the duration of the sample of the first filtered communication signal during a second state of the clock signal.

6. The resampler module of claim 1, wherein a second digital filter in the plurality of digital filters is configured to produce a second filtered communication signal in the plurality of filtered communication signals based on the clock signal and the communication signal, and wherein the switch module is further configured to reduce a number of samples of the second filtered communication signal.

7. The resampler module of claim 1, wherein the switch module is configured to hold the first filtered communication signal for the duration of the sample of the first filtered communication signal to reduce the number of samples of the first filtered communication signal.

8. A physical layer interface (PHY), comprising:

an analog to digital converter (ADC) configured to produce an oversampled signal based on a received communication signal; and

a resampler module coupled to the ADC, wherein the resampler module is configured to;

produce a plurality of filtered oversampled signals by filtering the oversampled signal, and

produce a resampled signal by selecting among the plurality of filtered oversampled signals to reduce, based on a cycle of a clock signal, a number of samples in the plurality of filtered oversampled signals.

9. The PHY of claim 8, further comprising a clock generator coupled to the ADC and the resampler module, wherein the clock generator is configured to produce the clock signal.

10. The PHY of claim 9, wherein the clock generator is further configured to adjust the clock signal from a first frequency to a second frequency if the first frequency is at risk of interfering with the received communication signal.

11. The PHY of claim 8, further comprising a baseband processing module coupled to the resampler module, wherein the baseband processing module is configured to produce a decoded communication signal based on the resampled signal.

12. The PHY of claim 11, wherein the baseband processing module is configured to produce the decoded communication signal during a first state of the clock signal.

13. The PHY of claim 12, wherein the baseband processing module is further configured to be inactive during a second state of the clock signal.

14. The PHY of claim 11, wherein the resampler module is configured to select a first subset of samples of the plurality of filtered oversampled signals to reduce the number of samples in the plurality of filtered oversampled signals.

15. The PHY of claim 11, wherein the resampler module is configured to ignore a first subset of samples of the plurality of filtered oversampled signals to reduce the number of samples in the plurality of filtered oversampled signals.

16. A method, comprising:

receiving, from a receiver device, a plurality of communication signals;

producing, based on the plurality of communication signals and a clock signal, a plurality of filtered communication signals;

selecting a first filtered communication signal in the plurality of filtered communication signals during a first cycle of the clock signal;

selecting a second filtered communication signal in the plurality of filtered communication signals during a second cycle of the clock signal; and

reducing a first number of samples of the first filtered communication signal and a second number of samples of the second filtered communication signal.

17. The method of claim 16, wherein the selecting the first filtered communication signal comprises selecting the first filtered communication signal during a first state of the clock signal.

18. The method of claim 17, wherein the selecting the second filtered communication signal further comprises selecting the second filtered communication signal during the first state of the clock signal.

19. The method of claim 17, wherein the reducing comprises:

holding the first filtered communication signal during a second state of the clock signal to reduce the first number of samples of the first filtered communication signal.

20. The method of claim 19, wherein the reducing further comprises:

holding the second filtered communication signal during a second state of the clock signal to reduce the second number of samples of the second filtered communication signal.