Calculation and verification of transmit power levels in a signal point transmission system
DCFirst Claim
1. A modem capable of communicating over a communication channel using a constellation including a plurality of signal points, said modem comprising:
- a processor capable of determining a probability of transmission of each signal point of said constellation;
a transmit power calculation element capable of calculating an average power of said signal points using a power formula based on said probability of transmission of each said signal point; and
a comparator capable of comparing said average power with a transmit power limit.
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Abstract
A pulse code modulation modem system utilizes the same total average transmit power formula for designing signal point constellations and for verifying that the transmit power of the signal point constellations are within a designated maximum power limit. The transmit power of the signal point constellations designed by the client modem is also calculated by the server modem to verify that the transmit power limit imposed upon the server modem is not exceeded. In addition, the modem system is capable of designating a transmit power limit associated with one or more training signal points or a training sequence for use during a training mode.
17 Citations
42 Claims
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1. A modem capable of communicating over a communication channel using a constellation including a plurality of signal points, said modem comprising:
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a processor capable of determining a probability of transmission of each signal point of said constellation;
a transmit power calculation element capable of calculating an average power of said signal points using a power formula based on said probability of transmission of each said signal point; and
a comparator capable of comparing said average power with a transmit power limit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of communicating over a communication channel using a constellation including a plurality of signal points, said method comprising:
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determining a probability of transmission of each signal point of said constellation;
calculating an average power of said signal points using a power formula based on said probability of transmission of each said signal point; and
comparing said average power with a transmit power limit. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A modem capable of communicating over a communication channel using a constellation including a plurality of signal points, said modem comprising:
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a transmit power calculation element capable of calculating an average power of said signal points using a power formula; and
a comparator capable of comparing said average power with a transmit power limit;
wherein said constellation is rejected if said average power exceeds said transmit power level. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A method of communicating over a communication channel using a constellation including a plurality of signal points, said method comprising:
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calculating an average power of said signal points using a power formula;
comparing said average power with a transmit power limit; and
rejecting said constellation if said average power exceeds said transmit power level. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A computer software product for communicating over a communication channel using a constellation including a plurality of signal points, said computer software product comprising:
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code for determining a probability of transmission of each signal point of said constellation;
code for calculating an average power of said signal points using a power formula based on said probability of transmission of each said signal point; and
code for comparing said average power with a transmit power limit. - View Dependent Claims (30, 31, 32, 33, 34)
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35. A computer software product for communicating over a communication channel using a constellation including a plurality of signal points, said computer software product comprising:
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code for calculating an average power of said signal points using a power formula;
code for comparing said average power with a transmit power limit; and
code for rejecting said constellation if said average power exceeds said transmit power level. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42)
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Specification