Cosine signal and Chirp signal combined signal modulating and demodulating method, and signal transmitting and receiving method based on the method

A chip signal and signal modulation technology, applied in the direction of phase modulation carrier system, etc., can solve the problems of non-orthogonal performance and low system capacity, so as to improve the utilization rate, improve the system capacity, and reduce the transmission bit error rate. worsening effect

Inactive Publication Date: 2011-08-17
HARBIN INST OF TECH
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Problems solved by technology

[0003] The present invention is to solve the problem that the performance of the existing system using 8PSK or 16PSK modulation will be affected by the non-orthogonality between the signals of each constellation point, and the capacity of the system using QPSK modulation is low, and proposes a cosine Signal modulation and demodulation method combined with chip signal and signal transmission and reception method based on said method

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  • Cosine signal and Chirp signal combined signal modulating and demodulating method, and signal transmitting and receiving method based on the method
  • Cosine signal and Chirp signal combined signal modulating and demodulating method, and signal transmitting and receiving method based on the method
  • Cosine signal and Chirp signal combined signal modulating and demodulating method, and signal transmitting and receiving method based on the method

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specific Embodiment approach 1

[0028] Embodiment 1: A signal modulation and demodulation method combining cosine and chip signals, characterized in that: Modulation method: 4 binary digital signals obtained after serial / parallel conversion and 4 orthogonal intermediate frequency signals Modulation to obtain 4 channels of modulation signals; demodulation method: match and correlate the mixed signal to be demodulated with 4 channels of orthogonal intermediate frequency signals, and then perform integral judgment demodulation to obtain demodulation information;

[0029] The four-way orthogonal intermediate frequency signals are two-way QPSK carrier signals cos(2πf c t), sin(2πf c t) and two chip signals cos(2πf c t+kπt 2 ), sin(2πf c t+kπt 2 ), where f c is the center frequency of the QPSK carrier signal, k is the sweep speed, and the four signals are orthogonal or quasi-orthogonal to each other.

[0030] The sweep speed k is given by the formula:

[0031] k=B / (T / 2)=4 / T 2

[0032] Definitely, where T ...

specific Embodiment approach 2

[0072] Specific implementation mode two: combination figure 1 and figure 2 This specific embodiment will be described. Described in this specific embodiment is based on the signal transmission and reception method of the signal modulation and demodulation method of a kind of cosine and Chip signal combination described in specific embodiment one, and its steps are:

[0073] Launch process:

[0074] Step 1: Perform serial / parallel conversion of the binary digital signal b(t) to be sent with a code rate of 4Rbit / s to obtain four signals b n (t), the code rate of each signal is reduced to Rbit / s, and R takes a positive integer;

[0075] Step 2: The four-way signal b obtained in step 1 n (t) and four quadrature intermediate frequency signals s n (t) Modulate to obtain four modulation signals p n (t)=b n (t)·s n (t);

[0076] Step 3: The four modulation signals p obtained in Step 2 n (t) superposition, to obtain the superimposed signal p(t);

[0077] Step 4: Perform up-...

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Abstract

A cosine signal and Chirp signal combined signal modulating and demodulating method and a signal transmitting and receiving method based on the method relate to a modulating / demodulating method and a transmitting / receiving method of the signal. The invention settles the problem that the system performance is easily affected by the nonorthogonality between the dot signals of each constellation whenthe prior 8PSK or 16PSK modulation mode is adopted and lower system capability when the QPSK modulating mode is adopted. The modulating method is that the four binary digital signals and four orthogonal intermediate frequency signals obtained after series / parallel conversion are modulated for obtaining four modulating signals. The demodulating method is that the mixed signal to be demodulated isrespectively matched and correlated with four orthogonal intermediate frequency signals for obtaining the demodulated information after integral determination demodulation. The transmitting process isthat the received mixed signal is superposed after modulation and is transmitted after upconversion and bandpass processing. The receiving process is that the demodulated information is converted tothe demodulation information. The cosine signal and Chirp signal combined signal modulating and demodulating method and signal transmitting and receiving method based on the method are suitable for the modulating / demodulating process of the signal.

Description

technical field [0001] The present invention relates to a modulation and demodulation method and a signal transmission and reception method. Background technique [0002] PSK (Phase Shift Keying) is a phase modulation algorithm that encodes bits of digital information with each phase change by adjusting the phase of the carrier. 8PSK modulation corresponds to 8 states of PSK, so each symbol of 8PSK can encode 3 bits; similarly, 16PSK modulation corresponds to 16 states of PSK, and each symbol can encode 4 bits. Compared with QPSK (Quadrature Phase Shift Keying), 8PSK and 16PSK can provide higher throughput capacity, but the anti-noise ability is not as good as QPSK. The system performance of 8PSK and 16PSK modulation will be affected by the non-orthogonality among the constellation signals, and the demodulation performance of the system is lower than that of BPSK (Binary Phase Shift Keying). Contents of the invention [0003] The present invention is to solve the problem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/20H04L27/22
Inventor 沙学军温容慧迟永钢邱昕吴宣利吴少川石硕
Owner HARBIN INST OF TECH
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