Innovative combinational closed-loop and open-loop satellite user terminal power control system

• US 8,155,584 B2
• Filed: 08/10/2009
• Issued: 04/10/2012
• Est. Priority Date: 03/10/2005
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Wang, Weizheng W., Chang, Anchung, Feria, Ying J.
• Primary Examiner(s): Lee, John J
• Application Number:
  US12/538,503
• Publication Number:
  US 20090290601A1
• Time in Patent Office: 974 Days
• Field of Search: 455/13.1, 455/13.4, 455/522, 455/427, 455/69, 455/67.13, 455/12.1, 455/3.01, 455/3.02, 455/430, 455/24, 455/450, 455/509, 455/414.1, 455/458, 455/13.2, 370/318, 370/321, 725/242, 375/285
• US Class Current: 455/13.2
• CPC Class Codes: H04B 7/18543 for adaptation of transmission parameters, e.g. power control for detecting or preventing errors in the information received H04L1/00
• CPC Class Codes: H04W 52/06 TPC algorithms
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/223 predicting future states of the transmission
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/243 taking into account interferences

Abstract

Devices and methods are disclosed for reducing power control cushion of a user terminal configured to communicate with a satellite and a gateway station. The present invention provides a power control algorithm implemented in a user terminal that is designed to operate in a satellite communication system. The power control algorithm can recursively calculate a returnlink power to reduce a power control cushion so that an extra link margin is available to the satellite communication system. The present invention also provides a source coding technique that provides an accurate feedback signal for the user terminal. The average metric of input signal frames is coded in a sequence of bits that are carried by contiguous output signal frames.

Claims

1. A method for coding an average metric value of a plurality of input signal frames, comprising:

receiving a plurality of input signal frames;

decoding the plurality of input signal frames;

calculating on a computer a plurality of metrics using the plurality of input signal frames;

calculating on the computer an average metric of the plurality of metrics;

selecting a sequence of bits comprising a plurality of synchronization bits and a set of information bits;

populating the sequence of bits, the set of information bits corresponding to the average metric; and

sending the sequence of bits using a plurality of output signal frames.

2. The method of claim 1, wherein the step of populating the sequence comprises:

assigning ones to the plurality of synchronization bits.

3. The method of claim 1, wherein the plurality of synchronization bits includes two bits and the set of information bits includes three bits.

4. The method of claim 1, wherein each of the plurality of output signal frames has one bit to carry one of the sequence of bits.

5. A method for coding an average metric value of a plurality of input signal frames, comprising:

receiving a plurality of input signal frames;

decoding the plurality of input signal frames;

calculating on a computer a plurality of metrics using the plurality of input signal frames;

calculating on the computer an average metric of the plurality of metrics;

coding the average metric; and

sending the average metric using a plurality of output signal frames.

6. The method of claim 5, wherein the step of coding comprises:

selecting a sequence of bits comprising a plurality of synchronization bits and a set of information bits;

assigning ones to the plurality of synchronization bits; and

populating the set of information bits in accordance with the average metric.

7. The method of claim 6, wherein the plurality of synchronization bits includes two bits and the set of information bits includes three bits, and wherein each of the plurality of output signal frames has one bit to carry one of the sequence of bits.

8. A method for coding an average metric value of a plurality of input signal frames, comprising:

receiving a plurality of input signal frames;

decoding the plurality of input signal frames;

calculating on a computer a plurality of metrics using the plurality of input signal frames;

calculating on the computer an average metric of the plurality of metrics;

selecting a sequence of bits comprising a plurality of synchronization bits and a set of information bits;

assigning ones to the plurality of synchronization bits;

populating the set of information bits in accordance with the average metric; and

sending the sequence of bits using a plurality of output signal frame.

9. A non-transitory computer readable storage medium embodying program code with instructions for coding an average metric value of a plurality of input signal frames, said computer readable medium comprising:

program code, stored on the computer readable medium, for receiving a plurality of input signal frames;

program code, stored on the computer readable medium, for decoding the plurality of input signal frames;

program code, stored on the computer readable medium, for calculating a plurality of metrics using the plurality of input signal frames;

program code, stored on the computer readable medium, for calculating an average metric of the plurality of metrics;

program code, stored on the computer readable medium, for selecting a sequence of bits comprising a plurality of synchronization bits and a set of information bits;

program code, stored on the computer readable medium, for populating the sequence of bits, the set of information bits corresponding to the average metric, wherein a populated sequence of bits is formed; and

program code, stored on the computer readable medium, for sending the sequence of bits using a plurality of output signal frames.

10. The non-transitory computer readable medium of claim 9, wherein said computer readable medium comprises:

program code, stored on the computer readable medium, for assigning ones to the plurality of synchronization bits.

11. The non-transitory computer readable medium of claim 9, wherein the plurality of synchronization bits includes two bits and the set of information bits includes three bits.

12. The non-transitory computer readable medium of claim 9, wherein each of the plurality of output signal frames has one bit to carry one of the populated sequence of bits.

13. The non-transitory computer readable medium of claim 9, wherein said computer readable medium is implemented in a gateway station.