Modulating device and method for digital signal coding
A digital signal, coded modulation technology, applied in the direction of digital transmission system, modulated carrier system, amplitude modulated carrier system, etc., can solve the problems that channel resource utilization rate or capacity cannot be further improved, information bearing resources are not fully utilized, etc., to achieve signal Strong anti-interference ability, saving utilization rate, and improving communication capacity
Inactive Publication Date: 2006-06-14
叶建国
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Problems solved by technology
The modulation of the digital signal according to the above formula (1) is actually a one-dimensional modulation method of amplitude modulation or frequency modulation (phase modulation). The information bearing resources of the carrier are not fully utilized, so that when the channel bandwidth is limited Resource utilization or capacity cannot be further improved
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[0056] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The following description will help those skilled in the art better understand other advantages, objectives and features of the present invention.
[0057] At first introduce the first embodiment of the device of the present invention, refer to figure 1 . figure 1 The digital signal encoding and modulating device 1 shown is used for encoding and modulating digital signals that need to be transmitted. The signal modulation process adopts frequency modulation, amplitude modulation and shape modulation three-dimensional modulation, so that the channel spectrum resources can be greatly utilized and the channel capacity can be improved. The device 1 mainly includes: a characteristic fundamental wave frequency controller f i (t)13. Characteristic fundamental waveform controller Z m 14. Characteristic fundamental wave amplitude controller V r (t) ...
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The invention discloses a digital signal encoding and modulation device, which is used for three-dimensional encoding and modulation that needs to transmit digital signals, including: a characteristic fundamental wave frequency controller f i (t), characteristic fundamental waveform controller Z m , characteristic fundamental wave amplitude controller V r (t), frequency and waveform controlled fundamental wave generator, D / A converter and buffer and gain controlled amplifier; wherein, the frequency and waveform controlled fundamental wave generator is in the characteristic fundamental wave frequency controller f i (t) and the characteristic fundamental waveform controller Z m Under the control of , generate frequency modulation signal Z m，f = ПZ m {2πf i (t)}; then use the D / A converter to convert the frequency-modulated signal Z m，f The expressed digital signal is converted to an analog signal, and finally buffered and gain-controlled amplifier, in the characteristic fundamental wave amplitude controller V r Under the control of (t), the analog Z of the D / A converter output m，f The signal is subjected to amplitude modulation to form a modulated characteristic fundamental wave signal output; the invention also discloses a digital signal coding modulation method.
Description
technical field [0001] The invention relates to a signal encoding and modulation device, in particular to a device and method for encoding and modulating a digital signal. Background technique [0002] In signal processing technology, in order to improve the efficiency and reliability of information transmission, modulation is usually performed before signal transmission. Modulation is the process of converting a signal in analog or digital form into a signal suitable for transmission on a channel. In the case of tight and limited wireless spectrum resources, people usually expect to adopt a suitable signal modulation method to increase the signal transmission rate of the channel, so as to transmit more signals on the channel with limited bandwidth. [0003] For a digital signal to be transmitted, it is usually necessary to modulate the digital signal onto a radio frequency (RF) carrier before sending it. The carrier carries the digital information to be transmitted. Sinc...
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IPC IPC(8): H04L27/02H04L27/32H04L1/00H04L27/00H04L27/10H04L27/12
CPCH04L27/10H04L27/12
Inventor 叶建国
Owner 叶建国