Radio receiver having a diversity antenna structure

• US 8,457,264 B2
• Filed: 09/17/2004
• Issued: 06/04/2013
• Est. Priority Date: 02/28/2003
• Status: Expired due to Fees

• Current Assignee: VIXS Systems Incorporated (Pixelworks Incorporated), VIXS Incorporated
• Original Assignee: VIXS Systems Incorporated (Pixelworks Incorporated)
• Inventors: Subasic, Bojan, Rybicki, Mathew A., Astrachan, Paul Morris, Girardeau, Jr., James Ward
• Primary Examiner(s): Vlahos, Sophia
• Application Number:
  US10/944,509
• Publication Number:
  US 20050032497A1
• Time in Patent Office: 3,182 Days
• Field of Search: 455/272, 455/575.7, 455132-135, 455/137, 455/273, 455/277.1, 375/347, 375/316, 375/206, 375/267, 375/349, 375/340, 375/351, 370/334
• US Class Current: 375/349
• CPC Class Codes: H04B 7/0857 using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]

Abstract

A radio receiver includes a first diversity antenna structure, a second diversity antenna structure, a first RF receiver section, a second RF receiver section, a combining module, and a baseband processing module. The first diversity antenna structure provides the received inbound RF signals from one of the plurality of first antennas based on a first antenna selection signal to produce first received inbound RF signals. The second diversity antenna structure provides the received inbound RF signals from one of the plurality of second antennas based on a second antenna selection signal to produce second received inbound RF signals. The first and second RF receiver sections are operably coupled to convert the first and second received inbound RF signals into first and second inbound baseband signals, respectively. The combining module combines the first and second inbound baseband signals to produce inbound baseband signals.

Claims

1. A radio receiver comprises:

a first diversity antenna structure having a plurality of first antennas, wherein each of the plurality of first antennas is operably coupled to receive inbound radio frequency (RF) signals;

a multiplexer attached to the first diversity antenna, wherein the multiplexer selects received inbound RF signals from one of the plurality of first antennas of the first diversity antenna structure based on a first antenna selection signal to produce first received inbound RF signals and wherein the multiplexer selects received inbound RF signals from a second one of the plurality of first antennas of the first diversity antenna structure based on a second antenna selection signal to produce second received inbound RF signals;

a first RF receiver section operably coupled to convert the first received inbound RF signals into first inbound baseband signals;

a second RF receiver section operably coupled to convert the second received inbound RF signals into second inbound baseband signals;

a combining module operably coupled to combine the first and second inbound baseband signals to produce inbound baseband signals; and

a baseband processing module operably coupled to;

adjust at least one of gain and phase in a digital domain on a subcarrier by subcarrier basis of at least one of the first RF receiver section and the second RF receiver section based on signal integrity of at least one of the first received inbound RF signals and the second received inbound RF signals; and

produce the first and second antenna selection signals based on signal integrity of the plurality of first antennas of the first diversity antenna structure.

2. The radio receiver of claim 1, wherein the baseband processing module functions to:

convert the inbound signals into inbound data.

3. The radio receiver of claim 2, wherein the baseband processing module further functions to:

adjust the at least one of the gain and phase in the digital domain on the subcarrier by subcarrier basis prior to generating the antenna select signals or after generating the antenna select signals.

4. The radio receiver of claim 2, wherein the baseband processing module further functions to:

adjust the at least one of the gain or phase in an analog domain at a channel level.

5. The radio receiver of claim 1, wherein each of the plurality of first antennas comprises at least one of:

a spatial diverse antenna; and

a polar diverse antenna.

6. The radio receiver of claim 1 further comprises:

a second diversity antenna structure having a plurality of second antennas, wherein each of the plurality of second antennas is operably coupled to receive the inbound RF signals, wherein the second diversity antenna structure provides the received inbound RF signals from one of the plurality of second antennas based on a third antenna selection signal to produce third received inbound RF signals;

a third RF receiver section operably coupled to convert the third received inbound RF signals into third inbound baseband signals;

the combining module operably coupled to combine the first, second, and third inbound baseband signals to produce the inbound baseband signals; and

the baseband processing module operably coupled to produce the third antenna selection signal based on the signal integrity of the second diversity antenna structure.

7. A radio receiver comprises:

a diversity antenna structure having a plurality of antennas, wherein each of the plurality of antennas is operably coupled to receive inbound radio frequency (RF) signals, wherein the diversity antenna structure includes a single antenna select input and receives antenna selection signals on the single antenna select input and wherein the diversity antenna structure selects first received inbound RF signals from one of the plurality of antennas based on a first antenna selection signal from the single antenna select input and selects second received inbound RF signals from another one of the plurality of antennas based on a second antenna selection signal from the single antenna select input, wherein the diversity antenna structure comprises;

a multiplexer that includes N inputs and M outputs, wherein N and M are positive integers and wherein the N inputs of the multiplexer are operably coupled to the plurality of antennas and a control input is operably coupled to receive the first and second antenna selection signals; and

a plurality of low noise amplifiers operably coupled to the M outputs of the multiplexer, wherein the plurality of low noise amplifiers provide the first and second received inbound RF signals;

a first RF receiver section operably coupled to convert the first received inbound RF signals into first inbound baseband signals;

a second RF receiver section operably coupled to convert the second received inbound RF signals into second inbound baseband signals;

a combining module operably coupled to combine the first and second inbound baseband signals to produce inbound baseband signals; and

a baseband processing module operably coupled to convert the inbound baseband signals into inbound data and to produce the first and second antenna selection signals based on signal integrity of the diversity antenna structure.

8. A radio receiver comprises:

a diversity antenna structure having a plurality of antennas, wherein each of the plurality of antennas is operably coupled to receive inbound radio frequency (RF) signals, wherein the diversity antenna structure includes a single antenna select input and receives antenna selection signals on the single antenna select input and wherein the diversity antenna structure selects first received inbound RF signals from one of the plurality of antennas based on a first antenna selection signal from the single antenna select input and selects second received inbound RF signals from another one of the plurality of antennas based on a second antenna selection signal from the single antenna select input, wherein the diversity antenna structure comprises;

a plurality of low noise amplifiers operably coupled to the plurality of antennas; and

a multiplexer that includes M outputs and N inputs, wherein M and N are positive integers and wherein the N inputs of the multiplexer are operably coupled to outputs of the plurality of low noise amplifiers, and a control input is operably coupled to receive the first and second antenna selection signals, wherein the M outputs of the multiplexer provide the first and second received inbound RF signals;

a first RF receiver section operably coupled to convert the first received inbound RF signals into first inbound baseband signals;

a second RF receiver section operably coupled to convert the second received inbound RF signals into second inbound baseband signals;

a combining module operably coupled to combine the first and second inbound baseband signals to produce inbound baseband signals; and

a baseband processing module operably coupled to convert the inbound baseband signals into inbound data and to produce the first and second antenna selection signals based on signal integrity of the diversity antenna structure.

9. A radio receiver comprises:

a diversity antenna structure having a plurality of antennas, wherein each of the plurality of antennas is operably coupled to receive inbound radio frequency (RF) signals, wherein the diversity antenna structure includes a single antenna select input and receives antenna selection signals on the single antenna select input and wherein the diversity antenna structure selects first received inbound RF signals from one of the plurality of antennas based on a first antenna selection signal from the single antenna select input and selects second received inbound RF signals from another one of the plurality of antennas based on a second antenna selection signal from the single antenna select input;

a first RF receiver section operably coupled to convert the first received inbound RF signals into first inbound baseband signals;

a second RF receiver section operably coupled to convert the second received inbound RF signals into second inbound baseband signals; and

a combining module operably coupled to combine the first and second inbound baseband signals to produce inbound baseband signals; and

a baseband processing module operably coupled to convert the inbound baseband signals into inbound data and to produce the first and second antenna selection signals based on signal integrity of the diversity antenna structure, wherein the baseband processing module functions to;

adjust at least one of gain and phase in a digital domain on a sub carrier by subcarrier basis of at least one of the first and second RF receiver sections based on signal integrity of at least one of the first received inbound RF signals and the second received inbound RF signals prior to generating the antenna select signals or after generating the antenna select signals.

10. The radio receiver of claim 9, wherein the baseband processing module further functions to:

adjust the at least one of the gain or phase in an analog domain at a channel level.

11. The radio receiver of claim 9, wherein each of the plurality of antennas comprises at least one of:

a spatial diverse antenna; and

a polar diverse antenna.

12. A radio receiver comprises:

a diversity antenna structure having a plurality of antennas, wherein each of the plurality of antennas is operably coupled to receive inbound radio frequency (RF) signals, wherein the diversity antenna structure selects a first received inbound RF signals from one of the plurality of antennas and selects a second received inbound RF signals from another one of the plurality of antennas based on an antenna selection signal;

a first RF receiver section operably coupled to convert the first received inbound RF signals into first inbound baseband signals;

a second RF receiver section operably coupled to convert the second received inbound RF signals into second inbound baseband signals;

a combining module operably coupled to combine the first and second inbound baseband signals to produce inbound baseband signals; and

a baseband processing module operably coupled to adjust a gain and phase in a digital domain on a subcarrier by subcarrier basis of the first and second RF receiver sections based on signal integrity of the first received inbound RF signals and the second received inbound RF signals and to convert the inbound baseband signals into inbound data, wherein the baseband processing module is operably coupled to produce the antenna selection signal based on signal integrity of inbound RF signals from each of the plurality of antennas.

13. The radio receiver of claim 12, wherein the baseband processing module further functions to:

adjust the gain and phase in a digital domain on a sub carrier by subcarrier basis of the first and second RF receiver sections prior to generating the antenna selection signal.

14. The radio receiver of claim 12, wherein the baseband processing module further functions to:

adjust the gain and phase in a digital domain on a sub carrier by subcarrier basis of the first and second RF receiver sections after generating the antenna selection signal.

15. The radio receiver of claim 12, wherein the plurality of antennas comprises a spatial diverse antenna.

16. The radio receiver of claim 12, wherein the plurality of antennas comprises a polar diverse antenna.

17. The radio receiver of claim 12, wherein the diversity antenna structure comprises:

a multiplexer that includes M outputs, wherein N inputs of the multiplexer are operably coupled to the plurality of antennas and a control input is operably coupled to receive the antenna selection signal; and

a plurality of low noise amplifiers operably coupled to the M outputs of the multiplexer, wherein the plurality of low noise amplifiers provide the first and second received inbound RF signals.

18. The radio receiver of claim 12, wherein the diversity antenna structure comprises:

a plurality of low noise amplifiers operably coupled to the plurality of antennas; and

a multiplexer that includes M outputs, wherein N inputs of the multiplexer are operably coupled to outputs of the plurality of low noise amplifiers, and a control input is operably coupled to receive the antenna selection signal, wherein the M outputs of the multiplexer provide the first and second received inbound RF signals.