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Method of generating direct spread msk signal and design method of conversion filter

A technology for converting filters and design methods, applied in electrical components, digital technology networks, impedance networks, etc., can solve the problems of complex implementation of direct-expanded MSK signals, unsuitable for high-speed data transmission, and occupying a lot of hardware resources, reducing development costs. Difficulty and cost, avoiding strict balance requirements, and the effect of occupying less resources

Active Publication Date: 2017-09-22
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0005] In order to solve the problems existing in the prior art, the present invention provides a new direct-spread MSK signal generation device suitable for all-digital modulation / demodulation structures, which does not need to maintain strict time synchronization, amplitude balance and phase alignment of the two channels. The performance of the system is also well maintained, avoiding the defects of conventional direct expansion MSK signal generation and implementation, such as complex generation and implementation, taking up a lot of hardware resources, and not suitable for high-speed data transmission requirements.

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  • Method of generating direct spread msk signal and design method of conversion filter
  • Method of generating direct spread msk signal and design method of conversion filter
  • Method of generating direct spread msk signal and design method of conversion filter

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Embodiment Construction

[0023] The input signal used by the conversion filter designed by the present invention comes from the carrier frequency f 1 The spread-spectrum signal x(t) modulated by the BPSK modulator is obtained by spreading the original signal d(t) and the pseudo-random sequence c(t), and the pseudo-random sequence is gold code.

[0024] The method adopted in the present invention is to pass the direct expansion BPSK signal through the conversion filter to generate the direct expansion MSK signal. According to the characteristics of the MSK signal, its center frequency meets the conditions:

[0025]

[0026] So, set here Among them, f 0 is the carrier frequency, T c is the spreading code period.

[0027] Thus, the impulse response of the conversion filter is

[0028]

[0029] The transfer function is

[0030]

[0031] The conversion filter for the above characteristics is usually implemented with an FIR filter, and a convex optimization algorithm can be used to design FI...

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Abstract

The invention provides a conversion filter design method for generating a direct-spread MSK signal, comprising: establishing a convex optimization model of Chebyshev approximation of the conversion filter; Estimate the conditions; solve the convex optimization model of Chebyshev approximation, and solve the power spectral density function; select the filter order, calculate the power spectral density value of the conversion filter, and judge whether the power spectral density value meets the design according to the mean square error value. requirements; if the optimized power spectral density function meets the design requirements, the coefficient of the conversion filter is obtained by using the spectral factorization method for the power spectral density value. The conversion filter design method provided by the present invention has a smaller filter order, and the hardware implementation of the conversion filter occupies less resources.

Description

technical field [0001] The invention relates to the technical field of digital communication, in particular to the design of an all-digital modulator in a spread spectrum communication system and a device for generating direct spread MSK signals. Background technique [0002] The direct spread MSK signal has the advantages of low interception of the spread spectrum system, multi-user random site selection capability, and strong anti-interference performance, and the minimum shift keying (Minimum Shift Keying, MSK) signal has a constant envelope, high spectrum utilization, With the advantages of energy concentration, fast sidelobe attenuation, low out-of-band radiation power, and insensitivity to nonlinear distortion, it has been widely used in tactical data links, civil aviation ground-to-air data links, missile guidance command transmission, and satellite communications. [0003] Direct spread MSK signals are usually generated using an orthogonal parallel dual-channel struc...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H17/02
Inventor 朱唯唯刘杰张舒谢仁宏芮义斌李鹏郭山红
Owner NANJING UNIV OF SCI & TECH
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