Method and system for adaptive interleaving

• US 7,398,436 B2
• Filed: 11/14/2005
• Issued: 07/08/2008
• Est. Priority Date: 04/17/1998
• Status: Expired due to Fees

• Current Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Original Assignee: AT&T Knowledge Ventures, L.P. (AT&T, Inc.)
• Inventors: Starr, Thomas J. J.
• Primary Examiner(s): Torres; Joseph D.
• Application Number:
  US11/273,419
• Publication Number:
  US 20060080586A1
• Time in Patent Office: 967 Days
• Field of Search: 714/701, 714/704, 714/708, 714/774
• 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 comprising:

a processor that is operative to determine a signal to noise ratio of a transmission channel, determine a data rate of the transmission channel, analyze the signal to noise ratio, analyze the data rate, and generate a control signal.

2. The invention of claim 1, wherein the processor is further operative determine a signal power by measuring a maximum amplitude deviation and a maximum phase deviation of data received via the transmission channel.

3. The invention of claim 1, wherein the processor is further operative determine a noise power by measuring an amplitude distance and a phase distance between adjacent points in a modulation constellation.

4. The invention of claim 1, wherein the processor is further operative to determine whether the signal to noise ratio exceeds a threshold.

5. The invention of claim 1, wherein the processor is further operative to determine whether the data rate exceeds a threshold.

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

7. The invention of claim 6, wherein the adaptive interleaver is operative to alter an interleaved signal in response to the control signal.

8. The invention of claim 6, wherein the adaptive interleaver is operative to alter the interleave depth of an interleaved signal in response to the control signal.