Adaptive equalizing and carrier recovering method suitable for high-order QAM and circuit thereof

An adaptive equalization and carrier recovery technology, which is applied in multi-carrier systems, shaping networks in transmitters/receivers, baseband system components, etc., can solve the problem of signal-to-noise ratio reduction, difficult carrier recovery algorithm carrier frequency offset, Signal distortion and other problems, to achieve the effect of reducing the steady-state phase error, improving the ability to capture frequency offset, and improving system performance
CN1688146AInactive Publication Date: 2005-10-26上海微科集成电路有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
上海微科集成电路有限公司
Publication Date
2005-10-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

This invention relates to a digital balance and carrier recover joint algorithm and its circuit structure used in high order quadrature amplitude modulation (QAM). Demodulation becomes difficult since the high-order QAM signal is influenced by the carrier frequency deviation and channel distortion, this invention applies four steps of blind balance, frequency discrimination, phase discrimination and the least square error adaptive balance to obtain the stable balance and carrier recover performance, which can capture the carrier frequency deviation of 9% baud rate. This invention also provides a structure for realizing the circuit.
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Description

technical field

[0001] The invention belongs to the technical field of digital communication, and specifically relates to an adaptive equalization and carrier recovery method for high-order QAM signals and a circuit structure thereof. Background technique

[0002] Under the urgent demand for huge information transmission in the digital information age, various modern modulation and demodulation technologies are pursuing reliable high-speed transmission rates. The development of digital communication technology makes various communication applications show a trend of mutual integration, such as the trend of "three networks in one" of telephone network, cable TV network and Internet. To implement many communication applications in the same wired channel, it is necessary to save limited spectrum resources, improve spectrum utilization, and achieve high-speed data transmission.

[0003] Quadrature Amplitude Modulation (QAM) technology has high spectral efficiency and strong ant...

Claims

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