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Short-distance radio network data transmitting method

A technology of network data and transmission method, applied in the direction of digital transmission system, electrical components, modulated carrier system, etc., can solve the problems of no peak value of received signal and local sequence, unsatisfactory autocorrelation characteristics, increased probability of wrong judgment, etc., to achieve Improve spectrum utilization, good diversity and multipath resistance, and reduce the effect of transmitting power

Inactive Publication Date: 2005-09-28
BEIHANG UNIV +1
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Problems solved by technology

[0010] The above-mentioned IEEE 802.15.4 standard 2.4G frequency band transmission method has considerable advantages in low-speed, low-power applications. Its disadvantages are, first, its spreading sequences are quasi-orthogonal Yes, the sidelobe and peak ratio of sequence cross-correlation can reach up to 0.25, which will increase the probability of wrong judgment during demodulation; second, it uses 32-bit chip sequence to represent 4 bits, plus half-sine shaping Pulse, the main lobe of the transmitted power spectrum reaches 3MHz at a data rate of 250Kb / s, and the spectral efficiency is only 0.083b / s / Hz; third, its preamble is composed of the first spreading sequence cycle repetition, but The autocorrelation characteristics of this sequence are not ideal. Although it is a 32-bit long sequence, its peak side lobe ratio is only 4, which is not conducive to the establishment of time synchronization; fourth, its preamble sequence is greatly affected by frequency offset. Large, when the frequency offset exceeds a certain value, the sliding correlation between the received signal and the local sequence may have no peak

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  • Short-distance radio network data transmitting method

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[0037] The method for establishing a mapping table between the bit sequence and the spreading sequence in the above method comprises the following steps:

[0038] (1) Using the chirp sequence as the initial spreading sequence, the initial spreading sequence is cyclically shifted to obtain all spreading sequences;

[0039] (2) Make the spread spectrum sequence correspond to the bit sequence, the corresponding method is: the decimal number representing the bit sequence corresponds to the number of bits of the cyclic shift.

[0040] In the framed data packet in the above method, after the bit sequence constituting the frame delimiter is retrieved according to the mapping table to correspond to the spread spectrum sequence, the spread spectrum sequence is conjugated.

[0041] Introduce content of the present invention in detail below in conjunction with accompanying drawing:

[0042] In the short-range wireless network data sending method of the present invention, a mappin...

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Abstract

The present invention relates to a short-range wireless network data transmitting method, belonging to the field of wireless communication technology. Said method includes the following steps: firstly, creating mapping list between bit sequence and band spread sequence; framing data sent from medium access control sulayer in network and searching band spread sequence correspondent to bit sequence in framed data packet from the above-mentioned mapping list between bit sequence and band spread sequence; pulse shaping said band spread sequence and obtaining baseband signal; modulating the baseband signal to in-phase and orthogonal carrier so as to obtain radio-frequency transmitting signal.

Description

technical field [0001] The invention relates to a short-range wireless network data sending method, which belongs to the technical field of wireless communication. Background technique [0002] In the application of short-range wireless network, in addition to its data rate and range, people also pay special attention to its power consumption, because most short-range wireless network devices are powered by batteries. The data transmission method determines the power efficiency, communication performance, and anti-interference ability of the system. The receiver design determines the receiver structure, algorithm complexity, and receiving performance. The two together determine the energy consumed by the system to transmit a bit. [0003] IEEE 802.15.4 is a short-range wireless network standard designed for low-speed, low-power consumption. It specifies the channel access mechanism - medium access control sublayer and data transmission method - physical layer, protocols of o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04L29/06
Inventor 田亚飞杨晨阳刘婷婷郦亮
Owner BEIHANG UNIV
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