Method for realizing general demodulation of different modulating signals

A technology for modulating signals and implementing methods, which is applied in multi-carrier systems and other directions, and can solve problems such as hardware resource consumption, complex receivers, and large volume and weight

Inactive Publication Date: 2011-02-16
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

Currently commonly used analog and digital modulation methods include AM, FM, PM, DSB, SSB, ASK, FSK, PSK, and QAM. In conventional methods, each modulation signal requires a dedicated hardwar

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  • Method for realizing general demodulation of different modulating signals
  • Method for realizing general demodulation of different modulating signals
  • Method for realizing general demodulation of different modulating signals

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Embodiment

[0222] The steps for realizing the demodulation method of AM signal are as follows:

[0223] Let the AM modulation signal be s(t)=[1+Qm(t)]cos2πf c t, where Q is the amplitude modulation coefficient, m(t) is the modulation information, f c is the carrier frequency.

[0224] 1) According to the signal carrier information received by the receiver, select the system clock frequency f clk And the frequency control word W is input to the phase accumulator to generate phase information θ, and input to the direct digital frequency synthesis module z in At the input end, after the rotation mode iteration in the circular coordinates using the extended convergence domain CORDIC algorithm, it is assumed that the local carrier at the receiving end has a frequency difference of f c +Δf, in the direct digital frequency synthesis module x out The output terminal gets the local carrier cosine signal cos(2π(f c +Δf)t), in the direct digital frequency synthesis module y out The output ter...

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Abstract

The invention discloses a method for realizing general demodulation of different modulating signals. The method comprises the following steps: firstly, using the direct numerical frequency synthesis method to generate two routes of local orthogonal carrier signals by expanding the rotation mode under the circumferential coordinate in the coordinated rotation digital computer (CORDIC) algorithm ofa convergence domain to synthesize equidirectional subcircuit data xI (t) and orthogonal subcircuit data xQ (t) with receiver terminal output signals; then filtering secondary harmonic components by a low pass filter; afterwards, inputting two routes of signals into a general demodulation module of the vector mode under the circumferential coordinate in the CORDIC algorithm of the convergence domain; finally, selecting a square root operation value or an arc tangent operation value according to different modulation modes to obtain demodulation information by filtering or differencing. In the invention, various modulation modes are integrated in the same hardware, so that the method has the characteristics of good flexibility and outstanding versatile performance; and meanwhile, the complex arithmetic operation is transformed into the displacement and add operation, as a result, the method can greatly reduce the complexity of hardware realization and has good carrier frequency mismatching resistance property.

Description

technical field [0001] The invention relates to the field of communication signal processing, in particular to a method for realizing general demodulation of different modulated signals. Background technique [0002] With the continuous development of modern communication technology, many receivers have broken through a single frequency band and mode, from traditional single-channel, single-frequency band, single-mode to standardized multi-channel, multi-band, multi-mode systems to meet the needs of all Communication requirements in the communication frequency band and various channel modulation modes. Currently commonly used analog and digital modulation methods include AM, FM, PM, DSB, SSB, ASK, FSK, PSK, and QAM. In conventional methods, each modulation signal requires a dedicated hardware circuit to demodulate. To achieve general demodulation of multiple signals, the receiver will be extremely complex, with a large volume and weight, and consume a lot of hardware resour...

Claims

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Application Information

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IPC IPC(8): H04L27/32
Inventor 李式巨杨杰王曰海高明王安定李芸
Owner ZHEJIANG UNIV
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