Satellite communication system uplink power control
First Claim
1. In a satellite communication system comprising a satellite arranged to receive data carried by an uplink signal having a received power and a transmitter arranged to transmit said uplink signal at a transmit power, an uplink power control method comprising:
- comparing the received power of at least a portion of said uplink signal with a power threshold;
adjusting the transmit power at least in part in response to said comparing;
determining errors in said data; and
adjusting said power threshold in response to said determined errors.
2 Assignments
0 Petitions
Accused Products
Abstract
A comprehensive system and method for uplink power control in a satellite communication system is provided. The energy of uplink signals received by a satellite from a terminal is compared to an energy threshold. The reference power level of the uplink signals is then adjusted based on the comparison of the received energy with the threshold. Preferably, the energy comparison is accomplished using synchronization bursts. Threshold leveling is then used to determine adjustments to the thresholds used in the energy comparison and the power offsets used in determining the transmission power for uplink signals. If the error rate is derived from the same type of digital coding used for transmitting synchronization bursts, the power threshold is adjusted. If the error rate is derived from a different type of digital coding than is used for transmitting synchronization bursts, a power offset is adjusted.
-
Citations
16 Claims
-
1. In a satellite communication system comprising a satellite arranged to receive data carried by an uplink signal having a received power and a transmitter arranged to transmit said uplink signal at a transmit power, an uplink power control method comprising:
-
comparing the received power of at least a portion of said uplink signal with a power threshold;
adjusting the transmit power at least in part in response to said comparing;
determining errors in said data; and
adjusting said power threshold in response to said determined errors. - View Dependent Claims (5, 6, 7)
-
-
2. In a satellite communication system comprising a satellite arranged to receive data carried by an uplink signal having a received power and a transmitter arranged to transmit said uplink signal at a transmit power, an uplink power control method comprising:
-
comparing the received power of at least a portion of said uplink signal with a power threshold;
adjusting the transmit power at least in part in response to said comparing;
determining errors in said data;
adjusting said power threshold in response to said determined errors; and
adjusting said transmit power at least in part in response to said determined errors in said data.
-
-
3. In a satellite communication system comprising a satellite arranged to receive data of a first type and a second type carried by an uplink signal having a received power and a transmitter arranged to transmit said uplink signal at a transmit power formed by a reference power combined with an offset power, an uplink power control method comprising:
-
comparing the received power of at least a portion of said uplink signal with a power threshold;
adjusting the offset power of said transmit power at least in part in response to said comparing;
determining errors in said first and second types of data;
adjusting said power threshold in response to said determined errors; and
adjusting the offset power of said transmit power to a first value in response to determined errors in said first type of data and adjusting said offset power to a second value in response to determined errors in said second type of data. - View Dependent Claims (4)
-
-
8. Uplink power control apparatus for use in a satellite communication system of the type where a satellite receives data carried by an uplink signal having a received power, comprising:
-
a transmitter arranged to transmit said uplink signal at a transmit power; and
a processor arranged to make a comparison of the received power of at least a portion of said uplink signal with a power threshold, adjust the transmit power at least in part in response to said comparison, determine errors in said data and adjust said power threshold in response to said determined errors. - View Dependent Claims (9, 14, 16)
-
-
10. Uplink power control apparatus for use in a satellite communication system of the type where a satellite receives data carried by an uplink signal having a received power, comprising:
-
a transmitter arranged to transmit said uplink signal at a transmit power comprising a reference power combined with an offset power; and
a processor arranged to make a comparison of the received power of at least a portion of said uplink signal with a power threshold, adjust the transmit power at least in part in response to said comparison, determine errors in said data and adjust said offset power of said power threshold in response to said determined errors.
-
-
11. Uplink power control apparatus for use in a satellite communication system of the type where a satellite receives first and second types of data carried by an uplink signal having a received power, comprising:
-
a transmitter arranged to transmit said uplink signal at a transmit power comprising a reference power combined with an offset power; and
a processor arranged to make a comparison of the received power of at least a portion of said uplink signal with a power threshold, adjust the offset power to a first value in response to said first type of data and to adjust said offset power to a second value in response to said second type of data, determine errors in said data and adjust said power threshold in response to said determined errors. and wherein said one or more processors are arranged to adjust said. - View Dependent Claims (12, 13, 15)
-
Specification