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Adaptive equalizing circuit in wired digital television

A cable digital TV, adaptive equalization technology, applied in color TV parts, TV system parts, TV and other directions, can solve problems such as huge hardware consumption, achieve simple structure, eliminate inter-symbol interference, and easy to implement. Effect

Inactive Publication Date: 2007-01-03
SOUTHEAST UNIV
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0033] The purpose of the present invention is to solve the above-mentioned problem of huge hardware consumption, and provide an adaptive equalization circuit in cable digital TV, which can reduce the hardware scale by about three-quarters under the premise of ensuring performance

Method used

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  • Adaptive equalizing circuit in wired digital television
  • Adaptive equalizing circuit in wired digital television
  • Adaptive equalizing circuit in wired digital television

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Embodiment Construction

[0059] Such as figure 1 As shown, an adaptive equalization circuit in a cable digital television includes a feedforward tap block operation circuit 1, an equalized Q-way output adder 2, an equalized I-way output adder 3, a decision circuit 4, an error calculation circuit 5, and a quantization Circuit 6, shift control amount addition circuit 7 and feed-back tap block operation circuit 8, with intersymbol interference at the k+k1th moment I tap input data x I，k+k1 And at the k+k1th moment, the Q tap input data x Q，k+k1 Connect the first feedforward tap block operation circuit 1, and the I block output y of the first feedforward tap block operation circuit 1 I，1 Connected to the balanced I channel output adder 3, Q channel block output y Q，1 Connected to the balanced Q-way output adder 2, the first feed-forward tap block operation circuit 1 outputs the I-way data x at the k+k1-2 moment I，k+k1-2 And the Q channel data x at the k+k1-2 moment Q，k+k1-2 Connect the second feed-for...

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Abstract

An adaptive equalized circuit being in consistence to DVB-C standard and being set in cable digital TV consists of front feed tap block operation circuit, equalized Q route adder, equalized I route adder, decision circuit, error calculation circuit, quantization circuit, addition circuit of displacement control amount and back feed tap block operation circuit. It is featured as using quantization circuit and addition circuit of displacement control amount to finalize coefficient update according to processing mode of two said block operation circuits.

Description

technical field [0001] The invention relates to a receiving technology in the field of digital communication, in particular to an adaptive equalization circuit in a cable digital television conforming to the DVB-C standard. Background technique [0002] QAM (Quadrature Amplitude Modulation) is applied in the DVB-C standard because of its efficient spectrum utilization. However, when transmitting high-speed digital signals on a band-limited channel, due to channel fading and multipath interference, and when installing wired network equipment, the installation of connectors will cause large echoes in signal transmission. In addition, amplifiers, filters, etc. in the transmission process may generate echoes, which will lead to a high bit error rate. [0003] The adaptive equalization circuit is to combat inter-symbol interference and large echo interference. First, the Constant Modulus Algorithm (CMA) method is used to provide the initial convergence of the equalizer equalizat...

Claims

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Application Information

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IPC IPC(8): H04L27/01H04N5/21H04N5/44H04N21/43
Inventor 吴建辉黄伟李红张萌时龙兴
Owner SOUTHEAST UNIV
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