Method and apparatus to provide multiple-mode spatial processing in a radio receiver

• US 7,702,298 B2
• Filed: 09/12/2007
• Issued: 04/20/2010
• Est. Priority Date: 09/28/2001
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Barratt, Craig H., Kasapi, Athanasios A.
• Primary Examiner(s): Maung; Nay A
• Assistant Examiner(s): PEREZ, ANGELICA
• Application Number:
  US11/853,992
• Publication Number:
  US 20080004078A1
• Time in Patent Office: 951 Days
• Field of Search: 455/101
• US Class Current: 455/101
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04B 17/336 Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04B 7/084 Equal gain combining, only phase adjustments antenna beam scanning or forming by phase or amplitude control H01Q3/26, e.g. phased arrays
• CPC Class Codes: H04B 7/0842 Weighted combining
• CPC Class Codes: H04B 7/0851 using training sequences or error signal minimizing error signal H04B7/0854
• CPC Class Codes: H04B 7/0857 using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
• CPC Class Codes: H04B 7/0868 Hybrid systems, i.e. switching and combining
• CPC Class Codes: H04B 7/0871 using different reception schemes, at least one of them being a diversity reception scheme
• CPC Class Codes: H04B 7/0874 using subgroups of receive antennas
• CPC Class Codes: H04B 7/0877 switching off a diversity branch, e.g. to save power
• CPC Class Codes: H04B 7/088 using beam selection
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

Methods and apparatuses, including computer program products, for spatial processing in a radio receiver. One embodiment is a radio receiver for operation in a wireless communication system. The radio receiver may include a receive processing unit to process signals received by an antenna array by applying a selected spatial processing mode of a plurality of spatial processing modes. The modes include one or more modes of one or more spatial processing methods. The receiver also includes a selector to select the spatial processing mode from the plurality of spatial processing modes. The selecting includes selecting the spatial processing method in the case that the set of spatial processing modes are of more than one spatial processing method.

Claims

1. A radio receiver comprising:

a receive processing unit coupled to process signals received from an antenna array by applying a selected spatial processing mode of a plurality of spatial processing modes of one or more spatial processing methods; and

a selector coupled to the receive processing unit to select the spatial processing mode from the plurality of spatial processing modes, including selecting the spatial processing method in the case that the plurality of spatial processing modes are of more than one spatial processing method.

2. The radio receiver of claim 1, wherein the plurality of spatial processing modes includes at least one of:

a group of one or more modes of a delay and add processing method;

a group of one or more modes of a switched antenna diversity spatial processing method;

a group of one or more modes of an adaptive smart antenna spatial processing method using a maximum ratio combining strategy determining method;

a group of one or more modes of an adaptive smart antenna spatial processing method using a known signal property strategy determining method;

a group of one or more modes of an adaptive smart antenna spatial processing method using a known training signal strategy determining method; and

a group of one or more modes of a switched beam smart antenna spatial processing method.

3. The radio receiver of claim 2, wherein at least one of the groups includes different modes of a spatial processing method that has an associated frequency of determining the spatial processing strategy, and wherein the spatial processing modes in the group have different associated frequencies of determining the strategy, such that selecting from amongst the different modes in the group provides modes that consume different amounts of overall computational power.

4. The radio receiver of claim 2, wherein the processing unit includes a plurality of receive paths, each receive path to couple to a respective antenna of the antenna array to accept the signal from the respective antenna, at least some of the receive paths switchable between a first operating mode and a second operating mode according to a power control signal, the first operating mode consuming more power than the second operating mode, the receiver further including:

a switchable power supply responsive to the power control signal and coupled to the receive paths to provide power to each receive path in the processing unit according to the power control signal,

wherein the power control signal depends on the operating mode such that some of the spatial processing modes differ in the amount of power consumption by having the receive paths operate at different operating modes.

5. The radio receiver of claim 2, wherein the plurality of spatial processing modes includes a group of one or more modes of a delay and add processing method,

wherein the antenna array includes a first antenna and one or more additional antennas,

wherein when the selector selects the delay and add method, the receive processing unit is further to delay and add process the signals received at the first antenna and at least one of the additional antennas, the delay and add processing forming a sum signal being the sum of the signal received at the first antenna and delayed versions of respective signals received at the one or more additional antennas, and

wherein the receive processing unit further includes a processor accepting the sum signal when the selector selects the delay and adding method, the processor having multipath combining capabilities.

6. The radio receiver of claim 2, wherein the plurality of spatial processing modes includes a plurality of modes of an adaptive smart antenna spatial processing method that periodically determines a smart antenna processing strategy, and wherein at least some of the different adaptive smart antenna modes differ by how often the smart antenna processing strategy is determined.

7. The radio receiver of claim 2, further comprising a memory to store instructions for spatial processing according to one or more of the spatial processing methods.

8. The radio receiver of claim 2, further comprising:

a user interface including a manual mode selector to manually select the spatial processing mode or no spatial processing.

9. The radio receiver of claim 2, wherein the selector automatically selects the spatial processing mode according to one or more selection criteria.

10. A radio receiver comprising:

a receive processing unit to process signals received at a plurality of antennas including a first antenna and one or more additional antennas, the receive processing unit including

a delay and add processing unit to process the signals received at the first antenna and at one or more of the additional antennas, the delay and add processing unit to form a sum signal being the sum of the signal received at the first antenna and delayed versions of respective signals received at the one or more additional antennas, the receive processor further including

a processor accepting the sum signal, the processor having multipath combining capabilities and forming a received signal, the receive processing unit further including

a receive electronics unit, the receive processing unit to apply a selected spatial processing mode to the signals, the selected spatial processing mode being of a plurality of spatial processing modes, including one or more modes of one or more spatial processing methods.

11. The radio receiver of claim 10, wherein the receive electronics unit includes:

a plurality of receive paths, each receive path to couple to a respective antenna of the plurality of antennas to accept the signal from the respective antenna, each including a downconverter to convert a radio frequency signal from its respective antenna to an intermediate frequency signal, the receive paths accepting signals from the one or more additional antennas including a delay unit after the downconverter to delay each signal by a respective predetermined amount,

an adder with inputs coupled to the outputs of the first receive path and the receive paths accepting signals from the one or more additional antennas, the adder to form the sum signal.

12. The radio receiver of claim 10, wherein the receive electronics unit includes:

a plurality of receive paths, each receive path to couple to a respective antenna of the plurality of antennas to accept the signal from the respective antenna, each receive path including an analog to digital converter to form a digitized signal from the respective antenna,

one or more respective digital delay element having an input coupled to the digital output of each of the receive paths accepting signals from the one or more additional antennas, digital delay elements introducing a respective predetermined delay to each digitized signal from the one or more additional antennas, each digital delay element having an output, and

a digital adder having a set of inputs coupled to the outputs of each digital delay element and of the receive path of the first antenna, the adder to form the sum signal from the outputs of the receive paths.

13. The radio receiver of claim 10, wherein the receive electronics unit includes:

a plurality of receive paths, each receive path to couple to a respective antenna of the plurality of antennas to accept the signal from the respective antenna, each including a downconverter to convert a radio frequency signal from its respective antenna to an intermediate frequency signal, the receive paths accepting signals from the one or more additional antennas including a delay unit after the downconverter to delay each signal by a respective predetermined amount, the first receive path including an analog adder having a set of inputs, one input coupled to the output of the downconverter of the first receive path and to the outputs of the respective delay units, the adder forming the sum signal, such that the first receive path further processes the sum signal, and the receive paths other than the first need less power to operate than the first receive path.

14. The radio receiver of claim 10, wherein the receive electronics unit includes:

a delay and add processor including;

one or more radio frequency delay elements having an input coupled to the one or more additional antennas, and

an analog adder with inputs coupled to the outputs of the first antenna and of the delay elements, the adder to form the sum signal;

a receive path having an input coupled to the output of the adder to accept the sum signal, the receive path including a downconverter to convert the radio frequency sum signal to an intermediate frequency signal, and an analog to digital converter to form a digitized sum signal for further processing by the processor.

15. A radio receiver comprising:

a receive processing unit to couple to a plurality of antennas to apply a selected spatial processing mode to the signals received at the plurality of antennas, the selected spatial processing mode being of a plurality of spatial processing modes, including one or more modes of one or more spatial processing methods.

16. A radio receiver comprising:

means for providing a plurality of spatial processing modes, including one or more modes of one or more spatial processing methods;

means for selecting a spatial processing mode from the provided plurality; and

means for processing the signals received at a plurality of antennas by the selected spatial processing mode.

17. The radio receiver of claim 16,

wherein the means for selecting selects the spatial processing method in the case that more than one spatial processing method is provided, and

wherein the means for processing the received signals applies a spatial processing method and a spatial processing mode thereof selected from the plurality of modes.

18. The radio receiver of claim 17, wherein the plurality of spatial processing modes includes at least one of:

a group of one or more modes of a delay and add processing method;

a group of one or more modes of a switched antenna diversity spatial processing method;

a group of one or more modes of an adaptive smart antenna spatial processing method using a maximum ratio combining strategy determining method;

a group of one or more modes of an adaptive smart antenna spatial processing method using a known signal property strategy determining method;

a group of one or more modes of an adaptive smart antenna spatial processing method using a known training signal strategy determining method; and

a group of one or more modes of a switched beam smart antenna spatial processing method.