Carrier selection for multiple antennas

• US 8,634,501 B2
• Filed: 06/01/2012
• Issued: 01/21/2014
• Est. Priority Date: 06/15/2007
• Status: Active Grant

• 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:
  US13/486,355
• Publication Number:
  US 20120238229A1
• Time in Patent Office: 599 Days
• Field of Search: 375/316, 375/344, 375/346, 375/347, 375/348, 375/349, 375/259, 375/260, 375/285, 455/63, 455/63.1, 455/63.3, 455/66.1, 455/67.11, 455/703, 455/71, 455/179.1, 455/182.1, 455/182.2, 455/182.3, 455/192.1, 455/192.2, 455/192.3
• US Class Current: 375/316
• 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 method, comprising:

determining, using a communications device, whether a first clock signal having a first frequency is at risk of interfering with a communications signal transmitted over a desired communications channel;

selecting, using the communications device, a second clock signal having a second frequency when the first clock signal is at risk of interfering with the communications signal;

processing, using the communications device, the communications signal using the second clock signal when the first clock signal is at risk of interfering with the communications signal;

sampling, using the communications device, the communications signal using the second clock signal to provide a digital signal; and

producing, using the communications device, a resampled digital signal by selecting a first subset of samples of the digital signal, wherein the resampled digital signal is sampled at the first frequency.

2. The method of claim 1, wherein the determining comprises:

receiving the communications signal from a radio receiver.

3. The method of claim 1, further comprising:

processing the first subset of samples of the digital signal; and

ignoring or holding a second subset of samples of the digital signal.

4. The method of claim 3, wherein the producing comprises:

processing the first subset of samples when the second clock signal is at a first state; and

ignoring or holding the second subset of samples when the second clock signal is at a second state.

5. The method of claim 1, further comprising:

processing, using the communications device, the communications signal using the first clock signal when the first clock signal is not at risk of interfering with the communications signal.

6. The method of claim 4, further comprising:

decoding the resampled digital signal when the second clock signal is at the first state; and

terminating the decoding when the second clock signal is at the second state.

7. The method of claim 1, further comprising:

producing a decoded communication signal based on the resampled digital signal.

8. A communications device, comprising:

a radio receiver configured to produce an analog signal; and

a physical layer interface (PHY) configured to;

adjust a clock signal from a first frequency to a second frequency when the first frequency is at risk of interfering with a communications signal,

sample the analog signal using the clock signal at the second frequency to provide a digital signal, and

produce a resampled digital signal by selecting a first subset of sample of the digital signal, wherein the resampled digital signal is sampled at the first frequency.

9. The communications device of claim 8, further comprising:

a plurality of antennas configured to convert the communications signal from an electromagnetic wave to a modulated radio frequency (RF) signal.

10. The communications device of claim 8, further comprising:

a media access controller (MAC) configured to operate upon the resampled digital signal based on a single stream communications standard or a multiple stream communications standard to provide a recovered information signal.

11. The communications device of claim 8, wherein the PHY is further configured to:

process a first quantity of samples from the digital signal that corresponds to the first frequency and to hold or ignore a second quantity of samples from the digital signal not corresponding with the first frequency to provide the resampled digital signal.

12. The communications device of claim 11, wherein the PHY is further configured to:

process the first subset of samples of the digital signal when the clock signal is at a first state; and

ignore or hold a second subset of samples of the digital signal when the clock signal is in a second state.

13. The communications device of claim 8, wherein the radio receiver is further configured to:

process the communications signal using the clock signal at the first frequency when the first frequency is not at risk of interfering with the communications signal; and

process the communications signal using the clock signal at the second frequency when the first frequency is at risk of interfering with the communications signal.

14. The communications device of claim 8, wherein the PHY is further configured to:

produce a decoded communication signal based on the resampled digital signal.

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

a clock generator module configured to adjust a clock signal from a first frequency to a second frequency when the first frequency is at risk of interfering with a communications signal;

an analog to digital converter configured to sample an analog signal using the clock signal at the second frequency to provide a digital signal; and

a resampler module configured to produce a resampled digital signal by selecting a first subset of samples of the digital signal, wherein the resampled digital signal is sampled the first frequency.

16. The PHY of claim 15, wherein the resampler module is further configured to:

process the first subset of samples of the digital signal; and

ignore or hold a second subset of samples of the digital signal.

17. The PHY of claim 15, wherein the clock generator module is further configured to:

adjust the clock signal to the second frequency based on a gating function.

18. The PHY of claim 15, wherein the clock signal has a first state associated with the first frequency and a second state associated with the second frequency.

19. The PHY of claim 15, wherein the PHY is further configured to:

provide an interface between a media access controller (MAC) and a radio receiver, the radio receiver being configured to select the communications signal in accordance with a single stream communications standard or a multiple stream communications standard.

20. The PHY of claim 15, further comprising:

a baseband processing module configured to produce a decoded communication signal based on the resampled digital signal.