AUTOMATIC GAIN CONTROL AND BASEBAND PREINTEGRATION TO REDUCE COMPUTATION REQUIREMENTS AT LOWER DATA RATES

• US 20120002765A1
• Filed: 06/21/2011
• Published: 01/05/2012
• Est. Priority Date: 07/01/2010
• Status: Active Grant

• Current Assignee: Zest Labs, Inc.
• Original Assignee: Intelleflex Corporation
• Inventors: Kawaguchi, Dean
• Granted Patent: US 9,224,016 B2
• Time in Patent Office: Days
• US Class Current: 375/345
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: G06K 7/0008 General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• CPC Class Codes: H04Q 2213/13095 PIN / Access code, authentication

Abstract

A method for processing baseband signals according to one embodiment includes receiving I and Q baseband signals; and selectively reducing an amount of samples of the baseband signals to be processed in a correlator, wherein the reduction rate is based on a data rate of the baseband signals. A preintegrator module according to one embodiment includes an automatic gain control section for performing automatic gain control on I and Q baseband signals; a first preintegrator coupled to an output of the automatic gain control section, the first preintegrator being for selectively reducing an amount of samples in the I baseband signal based on a data rate of the I baseband signal; and a second preintegrator coupled to an output of the automatic gain control section, the second preintegrator being for selectively reducing an amount of samples in the Q baseband signal based on a data rate of the Q baseband signal. Additional systems and methods are also presented.

Claims

1. A method for processing baseband signals, the method comprising:

receiving I and Q baseband signals; and

selectively reducing an amount of samples of the baseband signals to be processed in a correlator, wherein the reduction rate is based on a data rate of the baseband signals.

2. The method of claim 1, wherein an automatic gain control is performed prior to reducing the amount of samples to reduce a number of bits processed in the reducing step.

3. The method of claim 1, wherein the amount of samples is not reduced until a data rate of the baseband signals falls below a threshold.

4. The method of claim 1, wherein the amount of samples output is reduced by preintegrating input samples by adding a selectable number of the input samples together.

5. A system, comprising:

logic for receiving I and Q baseband signals; and

logic for selectively reducing an amount of samples of the baseband signals to be processed in a correlator, wherein the reduction rate is based on a data rate of the baseband signals.

6. The system of claim 5, wherein an automatic gain control is performed prior to reducing the amount of samples to reduce a number of bits processed by the logic for selectively reducing the amount of samples.

7. The system of claim 5, wherein the amount of samples is not reduced until a data rate of the baseband signals falls below a threshold.

8. The system of claim 5, wherein the logic for selectively reducing the amount of the samples of the baseband signals is configured to reduce the amount of output samples by preintegrating input samples by adding a selectable number of the input samples together.

9. The system of claim 5, further comprising at least one antenna for receiving a radio frequency signal from which the baseband signals are derived.

10. A preintegrator module, comprising:

an automatic gain control section for performing automatic gain control on I and Q baseband signals;

a first preintegrator coupled to an output of the automatic gain control section, the first preintegrator being for selectively reducing an amount of samples in the I baseband signal based on a data rate of the I baseband signal; and

a second preintegrator coupled to an output of the automatic gain control section, the second preintegrator being for selectively reducing an amount of samples in the Q baseband signal based on a data rate of the Q baseband signal.

11. The system of claim 10, wherein the amount of samples is not reduced until a data rate of at least one of the baseband signals falls below a threshold.

12. The system of claim 10, wherein the preintegrators each include logic for adding a selectable number of samples together.

13. The system of claim 10, further comprising at least one antenna for receiving a radio frequency signal from which the baseband signals are derived.