Working mode of equalization technology

Adaptive equalizer generally includes two working modes, namely, training mode and tracking mode. First, the transmitter sends a known fixed-length training sequence so that the equalizer of the receiver can be set correctly. A typical training sequence is a binary pseudo-random signal or a series of pre-specified data bits, and user data is transmitted immediately after the training sequence. The equalizer at the receiver will evaluate the channel characteristics through recursive algorithm and modify the filter coefficients to compensate the channel. When designing the training sequence, it is required that the equalizer can obtain the correct filter coefficients through the training sequence even under the worst channel conditions. In this way, after receiving the training sequence, the filter coefficient of the equalizer is close to the optimal value. When receiving data, the adaptive algorithm of the equalizer can track the changing channel, and the adaptive equalizer will constantly change its filtering characteristics.