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Tamed spread spectrum multiplexing method for high-speed data transmission

A high-speed data transmission and multiplexing technology, applied in the field of spread spectrum communication and high-speed data communication, can solve the problems of difficult to achieve short distance communication, destruction of orthogonal characteristics, low bit error rate, etc. Contradictions of bandwidth, strong practicability and operability, and the effect of improving frequency band utilization

Inactive Publication Date: 2011-10-12
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0004] (1) Sensitive to frequency offset and phase noise
Due to the phase noise jitter brought by the up-down converters and tuning oscillators at the transmitting and receiving ends, the frequency offset and phase noise will destroy the orthogonality between the subcarriers, and only 1% of the frequency offset can make the signal Noise ratio (SNR) decreased by 30dB
[0005] (2) The power peak-to-average ratio (PAPR) is large
If you want to increase the transmission bit rate by n times, you need to use 2 n Hexadecimal modulation, when n>3, regardless of MPSK or QAM modulation, in wireless communication, it is necessary to ensure low bit error rate and small transmission power, and it is difficult to achieve long communication and short distance

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  • Tamed spread spectrum multiplexing method for high-speed data transmission
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  • Tamed spread spectrum multiplexing method for high-speed data transmission

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Embodiment Construction

[0038] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0039] The wireless transmission system of a sensor's multi-channel data requires high transmission data rate (greater than 1Mbps), strong anti-interference performance (anti-interference tolerance greater than 6db), and long transmission distance (not less than 40Km). The soft spread spectrum multiplexing technology of high-speed data transmission of the present invention achieves good results.

[0040] The system uses three channels of binary DSSS signal multiplexing, two of which use pseudo-random codes with a code length of L=31, MCK / QPSK modulation, each channel transmits 5bit information, and two channels transmit 10bit information at a time. At the same time, a pseudo-random code with a code length of L=31×33=1023 is mixed in as a synchronization signal. The amplitude is 0.2 times the amplitude of the other two signals. The three signals use the same cod...

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Abstract

The invention relates to a tamed spread spectrum multiplexing method for high-speed data transmission. The method is characterized by comprising a transmitting step and a receiving step, wherein the transmitting step comprises the following steps of: converting 2n-bit serial data to be transmitted into two paths of parallel data, performing multi-nary data spectrum spread, acquiring a baseband signal, performing D / A (Digital / Analog) conversion to acquire an analog baseband signal, and transmitting through quadrature modulation; and the receiving step comprises the following steps of: converting a high-frequency signal received by an antenna into an intermediate-frequency signal, then converting the intermediate-frequency signal into a digital intermediate-frequency signal, and converting the digital intermediate-frequency signal into serial data through digital demodulation, synchronous signal de-spread and parallel-series conversion. The tamed spread spectrum multiplexing method for the high-speed data transmission is an effective technical means for solving the contradiction between the communication rate and the signal bandwidth of spread spectrum communication, so that the shading property, the reliability and the anti-interference performance of high-speed data communication equipment are improved.

Description

technical field [0001] The invention relates to a soft spread spectrum multiplexing method for high-speed data transmission, belonging to the fields of spread spectrum communication and high-speed data communication. Background technique [0002] High-speed data transmission In order to solve the contradiction between spread spectrum communication communication rate and signal bandwidth, the technical means commonly adopted at present is multi-ary system modulation. In order to further improve the frequency band utilization, it has developed from BPSK to QPSK and 8PSK. Of course, in theory, MPSK (multiphase phase shift keying, M=2 n , n=1, 2, 3) The frequency band utilization increases with the increase of M, but the carrier power required to maintain the same bit error rate will also increase with the increase of M. Considering the complexity of the equipment, the actual implementation of MPSK needs to pay a higher power cost than the theoretical calculation. At present, B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/69H04L27/18H04Q11/00
Inventor 廉保旺赵乃煌昝积成刘亚擎吴鹏唐成凯
Owner NORTHWESTERN POLYTECHNICAL UNIV
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