Method of generating msk modulation signal based on address correction of dds phase accumulator
What is AI technical title?
AI technical title is built by PatSnap AI team. It summarizes the technical point description of the patent document.
A phase accumulator and modulation signal technology, applied in the field of signal processing, can solve the problems of interfering with MSK modulation signals, realizing complex clutter signals, and difficulty in generating narrow pulses, etc.
What is AI technical title?
AI technical title is built by PatSnap AI team. It summarizes the technical point description of the patent document.
A phase accumulator and modulation signal technology, applied in the field of signal processing, can solve the problems of interfering with MSK modulation signals, realizing complex clutter signals, and difficulty in generating narrow pulses, etc.
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0038] 1. Technical principle:
[0039] Such as figure 2 As shown, the direct frequency synthesis DDS signal is to generate a waveform by using the phase accumulator to query the storage table that stores the waveform information of the trigonometric function, such as Figure 4 shown.
[0040] The MSK modulation signal generates a waveform by phase-modulating the I and Q signals through the input data, where the I and Q signals are as follows:
[0041] C 2 k Β· c o s Ο f b t = c o s ( Ο f b t ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Login to View More
Abstract
The invention discloses an MSK (minimum shift keying) modulation signal generation method based on DDS (direct digital synthesis) phase accumulator address modification. The method comprises the following steps: (1) setting the values of all phase accumulators generating carrier and data DDS signals; (2) reading in N-bit parallel data and performing serial-parallel conversion to obtain a serial sequence Y; (3) respectively adjusting the Q-path data output address and the I-path data output address; (4) calculating the final values of the DDS data output addresses of the I and Q paths, and updating the final values of the address basic values and carrier output addresses of the I and Q paths; (5) generating the DDS data signals and carrier signals of the I and Q paths by use of the final values of addresses and the final values of carrier output addresses output by the DDS data of the I and Q paths, and outputting the MSK signals of the data cod element; and (6) storing the MSK signal of the data code element, adjusting the data pointer, and outputting the MSK signal of the whole sequence Y. The method disclosed by the invention has the advantages of simple steps and little operational error and error rate, and can be applied to radio communication.
Description
technical field [0001] The invention belongs to the technical field of signal processing, in particular to a method for generating minimum frequency shift keying MSK modulation signals, which can be used in radio communication. Background technique [0002] Minimum frequency shift keying (MSK) modulation is a kind of constant envelope modulation, which can generate modulation signals with constant envelope and continuous phase. Due to the discontinuous phase of the signal processed by the general frequency shift keying FSK modulation form and the large frequency deviation, the spectrum utilization rate is low, while MSK is an FSK modulation form with a modulation index of only 0.5, which has a gap between adjacent symbols. The phase is continuous, the bandwidth is narrow, the spectrum main lobe energy is concentrated, the side lobe energy decays quickly, and the advantages of high frequency band utilization are widely used in the field of radio communication. [0003] The c...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More