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High-order multi-dimensional spread spectrum modulator, high-order multi-dimensional dispreading demodulator and spectrum spreading device

A technology of despreading demodulator and spread spectrum modulation, which is applied in the field of modulation and demodulation devices, can solve the problems of system normalized frequency deviation increase and failure, and achieve the goals of improving reliability, simplifying structure, and improving anti-interference ability Effect

Active Publication Date: 2017-01-25
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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Problems solved by technology

For low-speed data transmission, it means that the normalized frequency offset of the system increases, and the phase of the received signal changes rapidly with time, which will have a strong negative impact on the extraction of coherent carriers. The traditional coherent demodulation detection method has already fail

Method used

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  • High-order multi-dimensional spread spectrum modulator, high-order multi-dimensional dispreading demodulator and spectrum spreading device

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Embodiment Construction

[0015] refer to Figure 1 to Figure 3 The present invention is further described.

[0016] A high-order multidimensional spread-spectrum modulator includes an encoder 14, a time-diversity signal generator 15, a serial-to-parallel converter 16, a high-order multidimensional mapper 17, an orthogonal spread spectrum sequence generator 18, a signal shaping module 19 and a low IF modulator 20, figure 2 It is an electric principle block diagram of the present invention, and the embodiment is according to figure 2 Connect the lines. The encoder 14 receives the multiplexed data and the multiplexed clock and performs error correction coding, and outputs the encoded data and the encoded clock to the time diversity signal generator 15 respectively; the time diversity signal generator 15 encodes The data and the coded clock are converted into time-diversity signals and output to the serial-to-parallel converter 16; the serial-to-parallel converter 16 performs serial-to-parallel conve...

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Abstract

The invention discloses a high-order multi-dimensional spread spectrum modulator, a high-order multi-dimensional dispreading demodulator and a scatter communication high-order multi-dimensional spread spectrum device based on the high-order multi-dimensional spread spectrum modulator and the high-order multi-dimensional dispreading demodulator, and relates to a modulation-demodulation device with limited transmitting power, strong anti-interference capability and extremely low detection threshold in the scatter communication field. A high-order multi-dimensional spread spectrum algorithm is adopted, time diversity is combined, the anti-interference capability and anti-frequency offset capability of a scatter communication system are effectively improved under the condition of limited transmitting power, channel fading can be smoothed, and the diversity gain is obtained. In the invention, high-performance channel coding and decoding are used at the same time, the bit error rate performance of a system is improved, and especially reliable information transmission can be achieved under the conditions that the transmission loss is high, the systematic normalized frequency offset is large and the detection threshold is extremely low during long-distance scatter communication.

Description

technical field [0001] The invention relates to a modulation and demodulation device with limited transmission power, strong anti-interference ability and extremely low detection threshold in the field of scattering communication. It is especially suitable for reliable transmission of information under the conditions of large transmission loss and system normalized frequency deviation and extremely low detection threshold in long-distance scattering communication. Background technique [0002] When scattering long-distance communication, due to the large transmission loss, it is necessary to reduce the communication transmission rate. The problem is how to improve the transmission performance and reduce the impact of external interference under the extremely low detection threshold. Due to the limitation of clock source stability and the existence of Doppler frequency shift, the receiver carrier will produce a frequency offset. For low-speed data transmission, it means tha...

Claims

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Application Information

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IPC IPC(8): H04B7/22H04B1/707
CPCH04B1/707H04B7/22Y02D30/70
Inventor 张会珂沈斌松王洪磊平先仙
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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