A Blind Carrier Recovery Method Against Phase Noise Suitable for High-Order Modulation

A carrier recovery and phase noise technology, applied in the direction of modulated carrier system, carrier adjustment, multi-carrier system, etc., can solve the problems of judgment error, phase noise not considered, low modulation order, etc., to reduce complexity and improve frequency band utilization rate, the effect of suppressing the influence of phase noise

Active Publication Date: 2021-08-17
XIDIAN UNIV
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  • Application Information

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Problems solved by technology

The existing carrier recovery algorithm suitable for 4096-QAM modulation and demodulation (patent application number: 201711389604.X, hereinafter referred to as patent 1) only uses the carrier recovery algorithm in the traditional QAM modulation and demodulation system in 4096-QAM Simulation verification under modulation and demodulation, and the simplification of the hardware complexity of the carrier recovery algorithm suitable for 4096-QAM, without considering the influence of phase noise, when the FastCR algorithm in patent 1 is applied to the actual 4096-QAM modulation method, Phase noise may cause judgment errors, and the performance of the carrier recovery algorithm cannot be guaranteed
[0003] To sum up, the problems existing in the existing technology are: in the traditional microwave communication, the carrier recovery algorithm for the QAM system has a low modulation order, and the anti-phase noise performance of the carrier recovery algorithm is not considered, so it cannot be directly applied to the QAM system. High-order QAM modulation systems that are extremely sensitive to frequency and phase deviation; in the field of optical fiber communication, the extended Kalman carrier recovery algorithm that resists phase noise supports up to 64-QAM signals, and its performance in high-order modulation signals such as 4096-QAM no research
[0004] The difficulty and significance of solving the above technical problems: With the improvement of the QAM modulation order, the influence of phase noise on the phase jitter of the transmitted signal is becoming more and more negligible, which brings new examination and challenges to the existing carrier recovery technology

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  • A Blind Carrier Recovery Method Against Phase Noise Suitable for High-Order Modulation

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Embodiment 1

[0061] 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. 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 constellation points, resulting in an error in the system demodulation decision, making the system demodulation Deterioration of performance. Therefore, the receiving end of the communication system needs to compensate the frequency offset and phase offset, so that the carrier frequency difference and phase difference between the receiving end and the sending end are as small as possible, so as to ensure the reliability of the information recovered by the receiving end. Especially when the modulation order increases to 4096, the minimum phase difference b...

Embodiment 2

[0095] In view of the fact that most of the existing research literature on the DD-EKF algorithm directly gives the algorithm parameters under a specific research model or does not directly mention the specific parameter value, the present invention innovatively provides a threshold in the mode selection module of the algorithm Value β 1 , β 2 and frequency offset step size γ 1 , γ 2 and gamma 3 The reverse sequence simulation of the main parameters determines the parameter method. According to the method of determining parameters in reverse order, suitable parameters of the DD-EKF algorithm can be selected for any given application scenario for performance simulation verification, which is conducive to the popularization and application of the DD-EKF algorithm.

[0096] (1) Determine the threshold parameter β for locking switching 2 : Determine the range of the simulated signal-to-noise ratio for the algorithm. For example, the simulated signal-to-noise ratio range of 40...

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Abstract

The invention belongs to the technical field of wireless communication, and discloses a phase noise-resistant blind carrier recovery method suitable for high-order modulation. The invention is based on the original judgment-based extended Kalman carrier recovery algorithm suitable for low-order QAM modulation , adding a mode selection module for selecting different frequency offset step size and mean square error value calculation length parameters. By calculating the mean square error value of the symbol before and after the decision of different lengths, the frequency offset step size parameter of the extended Kalman is adaptively selected, so that the extended Kalman filter algorithm can also take into account the large frequency offset capture performance and low frequency offset in the high-order modulation system. Steady-state jitter performance. The carrier recovery algorithm of the present invention is a blind carrier recovery algorithm, and it is verified by simulation that it can resist phase noise and is an algorithm suitable for high-order modulation modes.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to an anti-phase noise blind carrier recovery method and a wireless communication system suitable for high-order modulation modes. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: Mobile communication has entered the LTE era and is about to enter the 5G era, requiring greater backhaul bandwidth. The service throughput of a single base station in the 5G communication standard needs to reach 10Gbps. The point-to-point microwave transmission link is a cost-effective technology for flexible and rapid deployment of the backhaul network. It is the main backhaul method in the mobile network. At the same time, it still maintains this position in the evolution of mobile broadband, providing larger and more efficient air interfaces. Bandwidth is the main goal of microwave communication technology deve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L27/38H04B10/69
CPCH04B10/695H04B10/697H04L27/0014H04L27/38H04L2027/0026
Inventor 宫丰奎李颖颖王昊宋佩阳张南
Owner XIDIAN UNIV
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