Adaptive direct conversion receiver

• US 7,447,286 B2
• Filed: 06/29/2006
• Issued: 11/04/2008
• Est. Priority Date: 04/23/2002
• Status: Expired due to Fees

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Wireless Corporation (Kyocera Corporation)
• Inventors: Forrester, Tim
• Primary Examiner(s): Ghayour; Mohammad H
• Assistant Examiner(s): Panwalkar; Vineeta S
• Application Number:
  US11/427,698
• Publication Number:
  US 20060239382A1
• Time in Patent Office: 859 Days
• Field of Search: 375/316, 375/345, 375/346, 375/377, 375/348, 375/349, 375/317, 375/319, 375/338, 375/339, 375/340, 375/259, 375/285, 375/344, 455/130, 455/150.1, 455/170.1, 455/324, 455/177.1, 455/323, 455313-316, 455/296, 455/39, 455/67.11, 455/67.13, 455/161.1, 455/161.3, 455/196.1, 455/230, 455/255
• US Class Current: 375/346
• CPC Class Codes: H04B 1/109 by improving strong signal performance of the receiver when strong unwanted signals are present at the receiver input
• CPC Class Codes: H04B 1/30 for homodyne or synchrodyne receivers demodulator circuits H03D1/22
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04

Abstract

A method and apparatus is disclosed for improving performance of a communication receiver. An exemplary method comprises calculating a rate of error associated with a received signal at a first time; comparing the rate of error at the first time to a first threshold rate of error; if the rate of error at the first time exceeds the first threshold rate of error, increasing current provided to a mixer in the receiver; calculating a rate of error associated with a received signal at a second time; comparing the rate of error at the second time to a second threshold rate of error; and if the rate of error at the second time is less than the second threshold rate of error, resetting the mixer current.

Claims

1. A method for reducing a rate of error in an output of a receiver comprising:

calculating a rate of error associated with a received signal at a first time;

comparing the rate of error at the first time to a first threshold rate of error;

if the rate of error at the first time exceeds the first threshold rate of error, increasing current provided to a mixer in the receiver;

calculating a rate of error associated with a received signal at a second time;

comparing the rate of error at the second time to a second threshold rate of error; and

if the rate of error at the second time is less than the second threshold rate of error, resetting the mixer current; and

if the second rate of error is greater than the second threshold rate of error, adjusting phase offset between quadrature separated signals.

2. The method of claim 1 wherein the second threshold rate for error is less than the first threshold rate of error.

3. A method for reducing a rate of error in an output of a receiver comprising:

calculating a rate of error associated with a received signal at a first time;

comparing the rate of error at the first time to a first threshold rate of error;

if the rate of error at the first time exceeds the first threshold rate of error, adjusting amplification applied to the received signal;

calculating a rate of error associated with a received signal at a second time;

comparing the rate of error at the second time to the rate of error at the first time; and

if the rate of error at the second time is less than the rate of error at the first time, increasing current provided to a mixer in the receiver.

4. The method of claim 3, further comprising:

calculating a rate of error associated with a received signal at a third time;

comparing the rate of error at the second time to the rate of error at the third time; and

if the rate of error at the third time is less than the rate of error at the second time, resetting the mixer current.

5. A system for reducing the bit error rate in a wireless receiver comprising:

a high frequency amplifier configured to amplify a received signal;

a mixer configured to demodulate the amplified signal to create a baseband signal;

a sampling unit configured to convert an adjusted baseband signal into a digital signal;

an error detection unit configured to process the digital signal to calculate a rate of error associated with the received signal at a first time; and

a controller configured to compare the rate of error at the first time to a first threshold rate of error, wherein if the rate of error at the first time exceeds the first threshold rate of error, then increased current is provided to the mixer;

the error detection unit configured to calculate a rate of error associated with the received signal at a second time; and

the controller configured to compare the rate of error at the second time to a second threshold rate of error, wherein if the rate of error at the second time is less than the second threshold rate of error, then resetting the mixer current, and if the second rate of error is greater than the second threshold rate of error, then adjusting phase offset between quadrature separated signals.