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Anti-phase deviation demodulation method of narrow-band high-speed frequency hopping system

A demodulation method and high-speed technology, applied in multi-frequency code systems, transmission systems, multi-carrier systems, etc., can solve the problems of demodulation performance deterioration, frequency hopping system efficiency decline, etc., to ensure reliability and communication distance, Overcome sensitivity performance degradation and save hardware resources

Active Publication Date: 2013-03-20
GUANGZHOU HAIGE COMM GRP INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the existing high-speed frequency hopping system, the phase synchronization deviation causes deterioration of the demodulation performance of the system, and the efficiency of the frequency hopping system is reduced in order to obtain an accurate initial phase. The purpose of the present invention is to provide a narrowband high-speed frequency hopping system. The system's anti-phase-bias coherent demodulation method does not require precise estimation of the initial phase, nor does it need to use complex phase-locked loop technology. The impact of coherent demodulation can effectively improve the system receiving performance

Method used

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  • Anti-phase deviation demodulation method of narrow-band high-speed frequency hopping system
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  • Anti-phase deviation demodulation method of narrow-band high-speed frequency hopping system

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Embodiment 1

[0015] Such as figure 1 , figure 2 As shown, the anti-phase offset demodulation method of the narrowband high-speed frequency hopping system of the present invention comprises the following steps:

[0016] In step (1), a training sequence is added at the data head of the transmitted data jump at the sending end as auxiliary data for phase estimation at the receiving end. The schematic diagram of the structure of the data jump is as follows: figure 1 As shown, the effective information to be sent is after the power down time, frequency switching time, and power up time. The effective information includes training sequence and data information, and the training sequence is in front of the data information. Each time value in the above-mentioned data jump structure and the number of symbols of effective information can be set differently according to the actual needs of different systems, and there is no special requirement; for example, when the training sequence uses a custo...

Embodiment 2

[0030] Such as figure 1 , image 3 As shown, the anti-phase offset demodulation method of the narrowband high-speed frequency hopping system of the present invention comprises the following steps:

[0031] Steps (1) to (3) are the same as steps (1) to (3) in Embodiment 1, and will not be described in detail.

[0032] Step (4), the original initial phase estimation value θ in the positive and negative directions 0 Each correction is performed once, and two corrected initial phase estimation values ​​θ are obtained 1 and θ 2 , so as to obtain three initial phase estimates.

[0033] Preferably, after the above three initial phase estimation values ​​are arranged in ascending or descending order, the difference between each two adjacent initial phase estimation values ​​is Δθ; that is, for the original initial phase estimation value θ 0 The corrections in the positive and negative directions are Δθ respectively. In this embodiment, Δθ in this step is also an empirical value ...

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Abstract

The invention relates to an anti-phase deviation demodulation method of a narrow-band high-speed frequency hopping system, comprising the following steps: using the existing method to establish initial synchronization, and then obtaining an estimated value theta0 of the initial phase; respectively modifying the estimated value theta0 of the initial phase at the positive direction and the negative direction for at least one time, obtaining at least 2 estimated values of the modified initial phase, thereby obtaining at least 3 estimated values of the modified initial phase; sending the estimated values of the modified initial phase and sampling values of received data to a demodulation mould; then adopting a coherent demodulation algorithm to carry out demodulation by the demodulation mould and selecting the optimal demodulation result; and outputting judgment bit information after selecting the optimal demodulation result, thereby obtaining final transmission information. Without the need of precise estimation of the initial phase or addition of the complexity of the coherent demodulation algorithm, the invention avoids the influence brought to the system by phase synchronism deviation, and therefore, the demodulation performance of the system can be effectively improved.

Description

technical field [0001] The invention belongs to a high-sensitivity receiving technology of a narrow-band high-speed frequency-hopping system, in particular to a coherent demodulation method of a narrow-band high-speed frequency-hopping system. Background technique [0002] The narrowband high-speed frequency hopping system is a technical means that can effectively resist various types of artificial tracking interference or unintentional interference, and provide reliable medium and low-speed data transmission (generally less than 64kbps); in practical applications, the narrowband high-speed frequency hopping system must have high In addition to the frequency hopping rate and high bandwidth utilization, it also needs to have high receiving sensitivity performance. Since differential demodulation has a 3dB loss relative to coherent demodulation, in order to obtain high sensitivity, frequency hopping systems generally use coherent demodulation, but coherent demodulation must re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/38H04B1/713H04B7/26H04L27/26
Inventor 王健杨剑锋吴越梁欣胡汉武李胜峰邓珂徐玲玲余启辉熊春柳
Owner GUANGZHOU HAIGE COMM GRP INC