Multi-system phase shifting keying (MPSK) modulation method, MPSK modulation device and function signal generator

Abstract

An embodiment of the invention provides a multi-system phase shifting keying (MPSK) modulation method, an MPSK modulation device and a function signal generator. The MPSK modulation device comprises a mapping module used for converting serial base band signals to be modulated into modulation code elements according to the modulation mode, a modulation phase converter used for converting the modulation code elements into phase words, a phase accumulator used for accumulating frequency control words to obtain a phase code, a phase summator used for summating the phase code and the modulation phase words to obtain a reading address, a carrier wave form storage used for reading carrier wave form data stored in the storage according to the reading address and a digital-to-analog converter used for converting the carrier wave form data into MPSK modulation signals in analog form. The MPSK modulation device has the advantages of being capable of achieving full digital achieving mode, free of a multiplying unit, free of quadrature carrier, good in expandability, simple to achieve and especially suitable for the function signal generator.

Description

technical field [0001] The invention relates to the technical field of electrical signal testing and measurement, in particular to a multi-ary phase-shift keying MPSK modulation method, an MPSK modulation device, and a function signal generator for generating MPSK modulation signals. Background technique [0002] In the measurement, verification and maintenance of electronic systems, function signal generators are widely used; with the development of electronic technology, signal generators are required to be able to generate rich modulation signals, including PSK modulation, which is widely used in optical communication networks today Signal. [0003] In the PSK modulation scheme, the modulated signal is represented using a finite number of phases. For example, in the binary phase shift keying (BPSK, Binary Phase Shift Keying) modulation method, two phases with a phase distance of 180° are used to represent "0" and "1" in the baseband signal respectively; for the quaternar...

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Problems solved by technology

[0006] The phase modulation method needs to use two multipliers to realize the modulation of two components, which will increase the power consumption of the system and the complexity of the design; and the fixed-point multiplication will inevitably introduce errors

[0007] The phase modulation method requires two strictly orthogonal carriers (that is, the phase difference is 90°), which is difficult to implement

[0008] From the perspective of the existing technology, the phase modulation method is generally implemented by analog devices. Due to the nonlinearity of analog devices and the influence of device characteristics changing with temperature, the system consistency and stability are poor. At the same time, there are some disadvantages as follows: high cost, poor flexibility , the modulation accuracy is not high, it is difficult to realize, and the structure is more complicated

Therefore, it is difficult to apply to a function signal generator with a high degree of digitization

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