Orthogonal sinusoidal type nonlinear chip keying modulation and demodulation method and device
A technology of quadrature sine and key modulation, applied in the field of communication system, can solve the problem of performance degradation of communication system
Active Publication Date: 2015-06-03
ZTE CORP
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[0007] The object of the present invention is to provide a kind of orthogonal sinusoidal non-linear chirp keying (Orthogonal Sine Non-linear Chirp Keying, OSNCK) modulation and demodulation method and device, can better solve the communication problem caused by Doppler frequency shift System performance issues
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[0050] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described below are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0051] figure 1 It is a functional block diagram of the quadrature sinusoidal nonlinear chip keying modulation method provided by the embodiment of the present invention, as shown in figure 1 shown, including:
[0052] Step 101, according to the center frequency f of the modulated signal c And the bandwidth B, the frequency f of the frequency change curve Li , to generate modulated signal waveform samples s i (t) the corresponding frequency change function f i (t), the modulated signal waveform sample s i (t) the corresponding frequency change function f i (t) for Among them, T is the symbol period, φ Li is the initial phase of the frequency vari...
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The invention discloses an orthogonal sinusoidal type nonlinear chip keying modulation and demodulation method and device, which relate to a communication system. The method comprises the following steps of generating a frequency change function corresponding to a modulated signal waveform sample according to center frequency and bandwidth of a modulated signal and frequency of a frequency change curve; utilizing an initial phase of the modulated signal waveform sample and the frequency change function to obtain the modulated signal waveform sample; mapping a data code-element string to be modulated into the modulated signal waveform sample as a modulated signal by a transmitting end according to a mapping relationship between m-ary digital modulation data and the modulated signal waveform sample; carrying out related processing and inverse mapping processing on a received signal by a receiving end to obtain the data code-element string according to the mapping relationship between m-ary digital modulation data and the modulated signal waveform sample. According to the orthogonal sinusoidal type nonlinear chip keying modulation and demodulation method and device, the communication system has a stronger Doppler frequency shift inhibiting ability, and the robustness of communication performance on Doppler frequency shift change is increased.
Description
technical field [0001] The invention relates to a communication system, in particular to an orthogonal sinusoidal nonlinear chip keying modulation and demodulation method and related devices. Background technique [0002] During the evolution to B3G / 4G, Orthogonal Frequency Division Multiplex (OFDM) is one of the key technologies. In fact, OFDM is a kind of multi-carrier modulation. Its main idea is to divide the channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them for transmission on each sub-channel. Orthogonal signals can be separated by using correlation techniques at the receiving end, which can reduce the inter-symbol interference (Inter-Symbol Interference, ISI) between sub-channels. The signal bandwidth on each sub-channel is smaller than the correlation bandwidth of the channel, so each sub-channel can be regarded as flat fading, so that inter-symbol interference can be eliminated....
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IPC IPC(8): H04L27/26
Inventor 弓宇宏孙志国毕峰袁明
Owner ZTE CORP