Innovative Combinational Closed-Loop and Open-Loop Satellite User Terminal Power Control System

• US 20090290601A1
• Filed: 08/10/2009
• Published: 11/26/2009
• 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.
• Granted Patent: US 8,155,584 B2
• Time in Patent Office: Days
• US Class Current: 370/476
• 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 a plurality of metrics using the plurality of input signal frames;

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

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

calculating 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 computer readable 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 for receiving a plurality of input signal frames;

program code for decoding the plurality of input signal frames;

program code for calculating a plurality of metrics using the plurality of input signal frames;

program code for calculating an average metric of the plurality of metrics;

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

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

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

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

program code for assigning ones to the plurality of synchronization bits.

11. The 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 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 computer readable medium of claim 9, wherein said computer readable medium is implemented in a gateway station.

14-38. -38. (canceled)