Carrier wave recovery system and method suitable for higher-order 4096-QAM

A carrier recovery and high-order technology, applied in multi-carrier systems, modulated carrier systems, transmission systems, etc., can solve the difficulties in implementing improved algorithms, limited application scenarios of microwave communication technology, and the complexity of hardware implementation of fast frequency offset capture algorithms, etc. problem, to achieve the effect of speeding up the loop convergence speed, facilitating circuit integration, and simplifying the complexity of hardware implementation

Active Publication Date: 2018-07-10
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hardware implementation complexity of the fast frequency offset capture algorithm proposed by Lee et al. makes it difficult to implement the algorithm and the existing improved algorithm, which makes the application scenarios of microwave communication technology extremely limited.

Method used

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  • Carrier wave recovery system and method suitable for higher-order 4096-QAM
  • Carrier wave recovery system and method suitable for higher-order 4096-QAM
  • Carrier wave recovery system and method suitable for higher-order 4096-QAM

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Embodiment 1

[0039] Due to its high bandwidth efficiency and power efficiency, QAM has been widely used in digital microwave communication systems, cable TV network data transmission and other fields in recent years. In a digital microwave communication system, the inconsistency of the local oscillator clocks at the sending end and the receiving end is the main cause of frequency offset and phase offset; secondly, the channel in an actual communication system is often not linear and time-varying, such as the Doppler response , the phase of the signal will be damaged during the transmission process, which will cause phase shift; in addition, the instability of the oscillator frequency of the tuner, down-conversion and other circuits will also cause frequency shift. For a QAM modulation system, the frequency offset and phase offset will cause the signal constellation diagram at the receiving end to rotate, which may cause the constellation point to fall within the judgment range of other cons...

Embodiment 2

[0043] The overall composition of the carrier recovery system suitable for high-order 4096-QAM in microwave communication is the same as that of embodiment 1, see figure 2 , the phase detector module of the present invention includes a simplified polarity decision phase detector, a tracker, an initial frequency offset estimator, a decision-oriented phase detector, a lock detector and a two-way data selector, and the phase detector module has three The output port 1 of the phase detector is the output port 1 of the lock detector, the input port 1 of the lock detector is the input port of the phase detector module, and the input port 2 of the lock detector is the phase detector facing the decision. Output port 2, the output port 2 of the phase detector module is provided with a two-way data selector, the control end of the two-way data selector is connected to the output port 2 of the lock detector, and the input port of the phase detector module and the phase detector There ar...

Embodiment 3

[0046] The overall composition of the carrier recovery system suitable for high-order 4096-QAM in microwave communication is the same as that of Embodiment 1-2, see image 3 , the output end of the simplified polarity judgment phase detector of the present invention is also provided with a two-way data selector, and there are three two-way data selectors in the simplified polarity judgment phase detector of the present invention, which are in the simplified polarity judgment phase detector The output terminal of the device is called the first two-way data selector, and the control terminal of the first two-way data selector is connected with a signal power detector. The signal power detector has two input terminals, which is a simplified polarity judgment phase detector. input terminal. The input port 1 and input port 2 of the first two-way data selector are respectively connected with the multiplier output end and the first register output end, and the input port 1 and input ...

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Abstract

The invention discloses a carrier wave recovery system and method suitable for higher-order 4096-QAM, and solves the technical problem that carrier wave recovery hardware of higher-order 4096-QAM signals in microwave communication is highly complex to realize. The system comprises a simplified polarity determining phase discriminator, a loop filter and a numerical control oscillator module. The method includes an open-loop work mode and a closed-loop work mode, in the open-loop work mode, phase compensation is carried out on a code element signal via initial frequency offset estimation, the closed-loop work mode further includes a rough phase compensation process and an accurate phase compensation process, phase errors in the rough phase compensation processes of open-loop and closed-loopstates are both estimated by the simplified polarity determining phase discriminator, only the code element signal of higher power is used to estimate the phase error, and a constant is used to normalize a module value of the code element. The hardware realizing complexity is low, the convergence speed is slightly high, and engineering realization is easy. The system and method are used for 4096-QAM microwave communication.

Description

technical field [0001] The present invention relates to the technical field of digital microwave communication, and mainly relates to the digital reception of digital cable TV network, microwave backhaul link and other quadrature amplitude modulation (QAM, Quadrature Amplitude Modulation) communication systems, in particular to a microwave communication suitable for high-order 4096- The QAM carrier recovery system and method can be used to deal with the carrier recovery problem of 4096-QAM signals in microwave communication. Background technique [0002] Due to its high bandwidth efficiency and power efficiency, QAM has been widely used in digital microwave communication systems, cable TV network data transmission and other fields in recent years. With the widespread application of 4G mobile communication technology and the advent of the new era of 5G, the number of mobile terminal users and new applications have emerged on a large scale, and the demand for bandwidth has als...

Claims

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Application Information

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IPC IPC(8): H04L27/38H04L27/00
CPCH04L27/0014H04L27/38H04L2027/0026H04L2027/0046H04L2027/0053H04L2027/0067
Inventor 宫丰奎王昊张航王勇张南
Owner XIDIAN UNIV
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