Patent ID: 7388909
Filing Date: 2008-06-17
Classification: H04L

Abstract:
1. An initialization method for use in a communication system having a plurality of transceivers, wherein the transceivers includes a master transceiver and a slave transceiver coupled to the master transceiver via a channel, each of the transceivers respectively having a noise canceller system, a timing recovery, and a equalizer system, the method comprising: executing a first stage, wherein the first stage at least comprises the steps of: transmitting a first idle sequence by the master transceiver; executing signal detection and channel estimation by the slave transceiver; determining a plurality of initial coefficients of the equalizer system of the slave transceiver according to the result of channel estimation; and training the timing recovery in both frequency and phase and the equalizer system of the slave transceiver; executing a second stage, wherein the second stage at least comprises the steps of: transmitting a second idle sequence by the slave transceiver; executing signal detection and channel estimation by the master transceiver; determining a plurality of initial coefficients of the equalizer system of the master transceiver according to the result of channel estimation; and training the timing recovery in phase, the equalizer system, and the noise canceller system of the master transceiver while training the noise canceller system of the slave transceiver; and executing a third stage, wherein the third stage at least comprises the steps of: training the timing recovery in phase, the equalizer system of the master transceiver while training the timing recovery in both frequency and phase and equalizer system of the slave transceivers, wherein the channel estimation executed by the slave transceiver comprises: generating a first frequency response corresponding to a first frequency and a second frequency response corresponding to a second frequency according to the first idle sequence by the master transceiver; and estimating the channel characteristics according to the first frequency response and the second frequency response; in which the first idle sequence is transmitted at a symbol rate, the first frequency and the second frequency are respectively 1/M and 1/N times of the symbol rate, and M is 2 wherein the channel estimation executed by the master transceiver comprises: generating a third frequency response corresponding to the first frequency and a fourth frequency response corresponding to the second frequency according to the second idle sequence by the slave transceiver; and estimating the channel characteristics according to the third frequency response and the fourth frequency response; in which the second idle sequence is transmitted at the symbol rate.