Adaptive wireless communication receiver

• US 6,693,953 B2
• Filed: 09/30/1998
• Issued: 02/17/2004
• Est. Priority Date: 09/30/1998
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Skyworks Solutions Incorporated
• Inventors: Cox, Earl C., Walley, Scott, Komaili, Jaleh, Anderton, David O., Wan, Yongbing
• Primary Examiner(s): Chin; Stephen
• Assistant Examiner(s): Ha; Dac V.
• Application Number:
  US09/163,797
• Publication Number:
  US 20030058929A1
• Time in Patent Office: 1,966 Days
• Field of Search: 375/142,141,150,230,343,143,152,232 708/323 455/13.4,38.3,67.3,134,135,161.3,69,226.2,226.3 370/290,320,332,335,342,441
• US Class Current: 375/141
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7085 using a code tracking loop, e.g. a delay-locked loop
• CPC Class Codes: H04B 1/709 Correlator structure
• CPC Class Codes: H04B 1/7093 Matched filter type
• CPC Class Codes: H04B 1/7115 Constructive combining of multi-path signals, i.e. RAKE receivers
• CPC Class Codes: H04B 1/7183 Synchronisation
• CPC Class Codes: H04B 2201/70707 Efficiency-related aspects
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/245 taking into account received signal strength
• CPC Class Codes: H04W 52/287 when the channel is in stand-by

Abstract

The present invention provides methods and apparatus for controlling power utilization in a wireless communication receiver. A representative system comprises a signal properties evaluation module, an analog to digital converter (ADC), and an analog to digital converter control module. The signal properties evaluation module evaluates the stability of a received signal, and provides an indication of the stability. The ADC control module responds to the signal properties evaluation module to select the precision of the ADC based upon the indication of the stability. The ADC has at least two modes of operation, comprising a first precision and a second precision, and is responsive to the signal properties evaluation module to operate in at least one of two modes based upon the stability. The ADC responds to the signal properties evaluation module so as to limit the amount of power consumed by the wireless communications device.

Claims

1. A power utilization control system for a wireless communications device, comprising:

a signal properties evaluation module, said module operative to evaluate the stability of a received signal, said module configured to provide an indication of said stability;

an analog to digital converter having at least two modes of operation, said analog to digital converter responsive to said signal properties evaluation module to operate in at least one of two modes, based upon said stability, wherein said first mode comprises operation at a first precision and said second mode comprises operation at a second precision;

wherein said analog to digital converter is configured to respond to said signal properties evalaution module so as to limit the amount of power consumed by said wireless communications device; and

an analog to digital converter control module responsive to said signal properties evaluation module to select the precision of said analog to digital converter based upon said indication of said stability.

2. The power utilization control system of claim 1, wherein signal properties evaluation module is implemented using a digital signal processor.

3. The power utilization control system of claim 1, wherein said signal properties evaluation module is configured to evaluate any of signal dynamics, signal noise levels, or signal strength.

4. The power utilization control system of claim 1, wherein said wireless communications receiver operates in accordance with code division multiple access.

5. The power utilization control system of claim 1, wherein said analog to digital converter is configured to select a lower bit precision for said at least one analog to digital converter when the signal is of generally high quality.

6. The apparatus of claim 1, wherein said signal properties evaluation module is operative to evaluate the quality of said received signal, and is configured to provide an indication of said quality, wherein said analog to digital converter is responsive to said indication of said quality.

7. The apparatus of claim 6, wherein said analog to digital converter module is responsive to said signal properties evaluation module to select said precision of said analog to digital converter based on upon said indication of said quality.

8. A method of reducing power consumption in a wireless communications receiver having an analog to digital converter comprising:

receiving a signal;

monitoring the characteristics of the incoming signal;

evaluating the stability of the incoming signal; and

altering the precision of said analog to digital converter based on the evaluated stability of the incoming signal so as to limit the amount of power consumed by said wireless communications receiver.

9. The method of claim 8, wherein altering the precision of the analog to digital converter comprises altering the precision between 5 bits and 2 or 3 bits.

10. The method of claim 8, wherein monitoring the characteristics of the incoming signal comprises monitoring any of signal dynamics, signal noise, signal level, bit error rate, or field error rate.

11. The method of claim 8, wherein said method is implemented in a communication receiver operating in accordance with code division multiple access.

12. The method of claim 8, wherein evaluating the characteristics of said incoming signal comprises determining the proper precision setting for said analog to digital converter.

13. The method of claim 8, further comprising:

evaluating the quality of said incoming signal; and

altering the precision of said analog to digital converter based on the evaluated quality of said incoming signal so as to limit the amount of power consumed by said wireless communications receiver.

14. A power utlilization control system for a wireless communications device comprising:

means for evaluating characteristics of a received signal for determining signal stability; and

means for actively reducing the precision of analog to digital converters in response to said received signal stability so as to limit the amount of power consumed by said wireless communications receiver.

15. The system of claim 14, further comprising:

means for evaluating characteristics of said received signal for determining signal quality; and

means for actively reducing the precision of said analog to digital converter in response to said received signal quality so as to limit the amount of power consumed by said wireless communications receiver.