Method and system for adaptive interleaving

• US 6,067,646 A
• Filed: 04/17/1998
• Issued: 05/23/2000
• Est. Priority Date: 04/17/1998
• Status: Expired due to Fees

• Current Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Original Assignee: Ameritech Corp. (AT&T, Inc.)
• Inventors: Starr, Thomas J J
• Primary Examiner(s): TU, CHRISTINE TRINH LE
• Application Number:
  US09/062,293
• Time in Patent Office: 767 Days
• Field of Search: 714/701, 714/704, 714/705, 714/708, 714/788, 364/246.4, 364/964.33, 364/944.91, 711/157, 711/127, 711/154
• US Class Current: 714/701
• CPC Class Codes: G06F 21/56 Computer malware detection or handling, e.g. anti-virus arrangements
• CPC Class Codes: H03M 13/2789 Interleaver providing variable interleaving, e.g. variable block sizes
• CPC Class Codes: H03M 13/2792 Interleaver wherein interleaving is performed jointly with another technique such as puncturing, multiplexing or routing
• CPC Class Codes: H03M 13/353 Adaptation to the channel
• CPC Class Codes: H03M 13/6508 Flexibility, adaptability, parametrability and configurability of the implementation
• 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
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0015 characterised by the adaptation strategy
• CPC Class Codes: H04L 1/0021 in which the algorithm uses adaptive thresholds
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/0075 Transmission of coding parameters to receiver H04L1/0023 takes precedence
• CPC Class Codes: H04L 1/20 using signal quality detector

Abstract

A method a system for automatically controlling an adaptive interleaver involves monitoring performance parameters of a transmission system and controlling the adaptive interleaver in response to the performance parameters. The SNR and the data rate of the transmission system are preferably determined. The data rate is analyzed and the adaptive interleaver is adjusted in response to the data rate and the SNR. Alternatively, the BER and the data rate of the transmission system are determined. The data rate is analyzed and the adaptive interleaver is adjusted in response to the data rate and the BER. Alternatively, any one of the SNR, BER or data rate can alone be monitored and used to the adaptive interleaver. The system provides a effective system for adjusting an adaptive interleaver in response to performance parameters of a transmission system.

Claims

1. A controller for an adaptive interleaver in a transmission system comprising a transmission channel, a transmitter coupled with the transmission channel and a receiver/decoder coupled with the transmission channel, the controller comprising:

a first performance parameter monitor responsive to the transmission system, the first performance parameter monitor responsive operative to generate a first input signal;

a second performance parameter monitor responsive to the transmission system, the second performance parameter monitor operative to generate a second input signal; and

means for providing an interleave control signal in response to the first and second input signals;

wherein the first and second performance parameters are selected from the group consisting of signal to noise ratio, bit error rate and data rate.

2. The controller of claim 1, wherein the means for providing an adaptive interleave control signal in response to the first and second input signals comprises computer readable program code.

3. The controller of claim 1, wherein the means for providing an adaptive interleave control signal in response to the first and second input signals comprises hardware.

4. The controller of claim 1, wherein the transmission channel comprises a fiber optic channel.

5. The controller of claim 1, wherein the transmission channel comprises a conductive wire channel.

6. The controller of claim 1, further comprising an adaptive interleaver coupled with the controller, the adaptive interleaver operative to receive the adaptive interleave control signal.

7. A controller for an adaptive interleaver in a transmission system comprising a transmission channel, a transmitter coupled with the transmission channel and a receiver/decoder coupled with the transmission channel, the controller comprising:

a performance parameter monitor responsive to the transmission system, the monitor operative to generate an adaptive interleave control signal;

wherein the performance parameter is selected from the group consisting of signal to noise ratio, bit error rate and data rate.

8. The controller of claim 7, wherein the transmission channel comprises a fiber optic channel.

9. The controller of claim 7, wherein the transmission channel comprises a conductive wire channel.

10. The controller of claim 7, further comprising an adaptive interleaver coupled with the controller, the adaptive interleaver operative to receive the adaptive interleave control signal.

11. A method for controlling an adaptive interleaver in a transmission system comprising a transmission channel, an adaptive interleaver coupled with the transmission channel and a receiver/decoder coupled with the transmission channel, the method comprising the steps of:

determining a first performance parameter of the transmission system;

determining a second performance parameter of the transmission system; and

providing an adaptive interleave control signal in response to the first and second performance parameters;

wherein the first and second performance parameters are selected from the group consisting of signal to noise ratio, bit error rate and data rate.

12. The method of claim 11, further comprising the step of analyzing the first performance parameter.

13. The method of claim 12, wherein the step of analyzing the first performance parameter comprises the step of determining whether the first performance parameter exceeds a predetermined threshold.

14. A method for controlling an adaptive interleaver in a transmission system comprising a transmission channel, a transmitter coupled with the transmission channel and a receiver/decoder coupled with the transmission channel, the method comprising the steps of:

determining a performance parameter of the transmission system;

providing an adaptive interleave control signal in response to the performance parameter; and

transmitting the adaptive interleave control signal to an adaptive interleaver;

wherein the performance parameter is selected from the group consisting of signal to noise ratio, bit error rate and data rate.

15. A controller for an adaptive interleaver in a transmission system comprising a transmission channel, a transmitter coupled with the transmission channel and a receiver/decoder coupled with the transmission channel, the controller comprising:

means for generating a first input signal as a function of a first performance parameter of the transmission system;

means for generating a second input signal as a function of a second performance parameter of the transmission system; and

means for providing an adaptive interleave control signal in response to the first and second input signals;

wherein the first and second performance parameters are selected from the group consisting of signal to noise ratio, bit error rate and data rate.

16. A computer usable medium having computer readable program code embodied therein for controlling an adaptive interleaver, the computer readable program code comprising:

computer readable program code means for causing a computer to generate an adaptive interleave control signal in response to a first input signal indicative of a first performance parameter and a second input signal indicative of a second performance parameter;

wherein the first and second performance parameters are selected from the group consisting of signal to noise ratio, bit error rate and data rate.

17. A computer usable medium having computer readable program code embodied therein for controlling an adaptive interleaver, the computer readable program code comprising:

computer readable program code means for causing a computer to analyze a first input signal indicative of a first performance parameter; and

computer readable program code means for causing a computer to generate an adaptive interleave control signal in response to the first input signal and a second input signal indicative of a second performance parameter;

wherein the first and second performance parameters are selected from the group consisting of signal to noise ratio, bit error rate and data rate.