TX preemphasis filter and TX power control based high speed two wire modem
First Claim
1. A two-wire modem for, upon transmitting, for a first predetermined time segment, a first line probing signal of varying frequency content and varying power level/levels over communication media, selecting a carrier frequency and a symbol rate from a predetermined plurality of carrier frequencies and symbol rates, a transmitter preemphasis filter and a transmitter power level determined from estimated characteristics of said communication media, to communicate with another modem over said communication media in a full duplex mode, said two-wire modem comprising:
- A) an echo and received signal analyzer for;
receiving at least one echo signal of said first line probing signal of varying frequency content and varying power level/levels from said communication media in said first predetermined time segment and estimating echo characteristics of said communication media based on an analysis of said received at least one echo signal of said first line probing signal; and
receiving a second line probing signal of varying frequency content and varying power level/levels from said communication media in a second predetermined time segment and estimating signal characteristics of said communication media based on an analysis of said received second line probing signal.andB) a TX preemphasis and TX power control processor, operably coupled to the echo and received signal analyzer, for selecting said carrier frequency and symbol rate from the predetermined plurality of carrier frequencies and symbol rates, the transmitter preemphasis filter from the plurality of predetermined transmitter preemphasis filters, and the transmitter power level using said estimates of the signal and echo characteristics of said communication media.
4 Assignments
0 Petitions
Accused Products
Abstract
A two wire modem 200, 500, 600 and a method 1000, 1100 select a carrier frequency and a symbol rate from a predetermined plurality of carrier frequencies and symbol rates to communicate with another modem over a communication media in a full duplex mode based on signal and echo characteristics of the communication media estimated by the modem.
124 Citations
16 Claims
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1. A two-wire modem for, upon transmitting, for a first predetermined time segment, a first line probing signal of varying frequency content and varying power level/levels over communication media, selecting a carrier frequency and a symbol rate from a predetermined plurality of carrier frequencies and symbol rates, a transmitter preemphasis filter and a transmitter power level determined from estimated characteristics of said communication media, to communicate with another modem over said communication media in a full duplex mode, said two-wire modem comprising:
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A) an echo and received signal analyzer for; receiving at least one echo signal of said first line probing signal of varying frequency content and varying power level/levels from said communication media in said first predetermined time segment and estimating echo characteristics of said communication media based on an analysis of said received at least one echo signal of said first line probing signal; and receiving a second line probing signal of varying frequency content and varying power level/levels from said communication media in a second predetermined time segment and estimating signal characteristics of said communication media based on an analysis of said received second line probing signal. and B) a TX preemphasis and TX power control processor, operably coupled to the echo and received signal analyzer, for selecting said carrier frequency and symbol rate from the predetermined plurality of carrier frequencies and symbol rates, the transmitter preemphasis filter from the plurality of predetermined transmitter preemphasis filters, and the transmitter power level using said estimates of the signal and echo characteristics of said communication media. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for, upon transmitting by a two-wire modem, for a first predetermined time segment, a first line probing signal of varying frequency content and varying power level/levels over a communication media, selecting a carrier frequency and a symbol rate from a predetermined plurality of carrier frequencies and symbol rates, a transmitter preemphasis filter and a transmitter power level determined from estimated characteristics of said communication media, to communicate with another modem over a communication media in a full duplex mode, said method comprising the steps of:
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A) receiving, by an echo and received signal analyzer, at least one echo signal of said first line probing signal of varying frequency content and varying power level/levels from said communication media in said first predetermined time segment and estimating echo characteristics of said communication media based on an analysis of said received at least one echo signal of said first line probing signal; B) receiving, by the echo and received signal analyzer a second line probing signal of varying frequency content and varying power level/levels from said communication media in a second predetermined time segment and estimating signal characteristics of said communication media based on an analysis of said received second line probing signal and for receiving at least one echo signal of said first line probing signal, and C) selecting, by a TX preemphasis and TX power control processor, said carrier frequency and symbol rate from the predetermined plurality of carrier frequencies and symbol rates, the transmitter preemphasis filter from the plurality of predetermined transmitter preemphasis filters, and the transmitter power level using said estimates of the signal and echo characteristics of said communication media. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification