Perturbed phase modulation DDS signal generation method

A technology of signal generation and phase modulation, applied in the direction of electrical components, etc., to achieve the effect of reducing phase noise and improving phase noise
CN108322189AActive Publication Date: 2018-07-24NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
Publication Date
2018-07-24

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Abstract

The invention discloses a perturbed phase modulation DDS sine wave signal generation method. The method is different from ordinary DDS of using a single-frequency control word and a single accumulatorand starts from the time-domain sampling process of the sine waveform, by means of the mutual effect of two control words and two accumulators, integral sampling time moments and perturbed fractionalsampling time moments are generated, precise moment sampling of each sine cycle is achieved, and sine waves are synthesized by means of phase perturbation and quadrature phase modulation; and due tothe fact that the independent accumulators are adopted in perturbation components, trigonometric function values of a perturbed phases can be approximately calculated, the table look-up capacity of the trigonometric functions is reduced, the frequency resolution is increased, the high-resolution Doppler frequency offset subcarrier digital signal generation problem is solved, and a new method is provided for generation of a wireless receiving synchronization system or low-phase noise sine wave signals.
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Description

1. Technical field

[0001] The invention belongs to the technical field of signal design and signal processing, in particular to a digital electronic system design technology for sine wave signal generation, reception and synchronization, and is a new method for synthesizing sine wave signals with high frequency resolution. 2. Background technology

[0002] Direct digital synthesis DDS (Direct Digital Synthesizer) is a sine wave generation method commonly used in modern digital electronic systems, but DDS requires a large trigonometric function table, and also needs to perform finite truncation of addresses, resulting in phase errors and causing Phase noise in sinusoidal signals, how to use less hardware resources to generate high-quality sinusoidal signals is still a hot issue that is constantly being pursued.

[0003] Ordinary DDS uses the accumulation of frequency control words to generate linear phase, and directly checks the sine table to generate sine waves. Due to the...

Claims

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