Information transmission method based on multi-way TPM signals
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A technology for modulating signals and information transmission, which is applied in the field of information transmission and can solve problems such as limitations
Inactive Publication Date: 2014-04-30
王红星
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[0005] To sum up, from the perspective of the spectrum characteristics of the TPM signal, it is difficult to design a filter according to the bandwidth of the phase-modulated signal. At the same time, the previous research on the detection and demodulation method of the phase-modulated signal is mainly limited to single-channel transmission
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Embodiment 1
[0108] Purpose of the embodiment: Taking a phase modulation communication system composed of three channels of phase modulation signals as an example, the original signal is demodulated and output after filtering in the ICA time domain.
[0109] Example steps:
[0110] 1) In this embodiment, the user transmits three phase modulation signals , , , no frequency interval is set, the carrier frequency is 20kHz, each bit is modulated by 20 sinusoidal carriers, the symbol transmission rate is 1000bit / s, the sampling frequency is 200kHz, and the starting time of phase jump is respectively set to the 9th, 13th and At the 18th carrier, the specific parameters are shown in Table 1, and the time-domain waveform after modulation is shown in image 3 .
[0111]
[0112] 2) The above three-way phase modulation signals are transmitted into the Gaussian white noise channel through the antenna, and are captured by three sensors at the receiving end to obtain three-way observation sig...
Embodiment 2
[0122] Purpose of the embodiment: Taking a phase modulation communication system composed of two phase modulation signals with different carrier frequencies as an example, the original signal is demodulated and output after filtering in the ICA time domain.
[0123] 1) In this embodiment, only two users are considered to transmit 2 phase modulation signals , , the symbol transmission rate is 1000bit / s, the carrier frequencies are 20kHz and 22kHz respectively, each bit is modulated by 10 sinusoidal carriers, and the initial moments of the phase jump are respectively set at the 5th and 9th carrier, adding noise SNR=10 , the specific parameters are shown in Table 2, and the modulated time-domain waveform is shown in Figure 11 , take the first 10 symbols in the figure.
[0124]
[0125]
[0126] 2) The above-mentioned three-way phase modulation signal is transmitted into the Gaussian white noise channel through the antenna, and is captured by three sensors at the receivin...
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Abstract
The invention discloses an information transmission method based on multi-way TPM signals, and belongs to the field of transmission methods of digital communication. In the information transmission method based on the multi-way TPM signals, with regard to the multi-way TPM transmission signals, time domain features of the TPM signals are extracted according to the ICA technology, and emission signals are recovered through detection. Through the ICA technology, the transmitted multi-way TPM signals can be received and then analyzed and processed so that phase jump characters of the TPM signals can be extracted. Information carried in the TPM signals is included in a short-time phase jump, the characters can be captured through ICA time domain filtering, and accordingly the TPM signals can be recovered by setting a detection threshold without a frequency domain. By means of the information transmission method based on the multi-way TPM signals, a receiver structure of a TPM communication system is simplified, binary modulation information transmission performance is improved, and multi-way signal transmission of the TPM communication system is effectively achieved.
Description
technical field [0001] The invention belongs to the technical field of digital communication transmission, and specifically relates to an information transmission method using independent component analysis technology in a multi-channel time-phase modulation communication system. Background technique [0002] American scholar H.R.Walker proposed the ultra-narrowband modulation method (UNB) in the late 1980s. This modulation technology opened up a new idea for effectively solving the problem of spectrum utilization in communication systems (H. R. Walker. Attain high bandwidth efficiency using VMSK modulation[ J]. Microwaves & RF Magazine, pp. 173-185, Dec. 1997.). Based on Walker's ultra-narrowband modulation method, the time-phase modulation method (Time-Phase Modulation, TPM), referred to as the time-phase modulation method, is a carrier modulation technology that utilizes the rapid falling or rising edge characteristics of rectangular pulses for phase modulation. The star...
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