Method for improving ultralow-power-consumption wireless communication transmission spectral efficiency

A wireless communication and spectrum transmission technology, applied in the field of wireless communication, can solve the problems of increased complexity and cost, low data rate, increased response, etc., and achieve the effect of improving frequency efficiency, sufficient spectrum resources, reducing cost and energy consumption

Active Publication Date: 2012-09-12
ARKMICRO TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] The low complexity, low power consumption, and low cost of ZigBee devices are undoubtedly one of its advantages that can be widely used, but its low data rate has become a constraint in its foreseeable future applications. The key factor of its development, the IEEE organization is also aware of this, and has successively added modulation methods to increase the data rate (such as 2450MHz chirp spread spectrum PHY in IEEE 802.15.4a-2007) in subsequent supplementary versions of the specification as Optional supplement, but the newly added modulation method is very different from the widely used modulation technology before, so it cannot be effectively compatible with the previous standard, which brings a sharp increase in complexity and cost and a response to power consumption increase at the expense of its original advantages

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  • Method for improving ultralow-power-consumption wireless communication transmission spectral efficiency
  • Method for improving ultralow-power-consumption wireless communication transmission spectral efficiency
  • Method for improving ultralow-power-consumption wireless communication transmission spectral efficiency

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Embodiment 1

[0043] This embodiment introduces a method for improving frequency efficiency by using an extended modulation mode, and specifically introduces three modulation technical solutions.

[0044] a) Modulation scheme 1: π / 4DQPSK

[0045] QPSK-QuadraturePhaseShiftKeying, quadrature phase shift keying, is a digital modulation method. DQPSK-Differential Quadrature Reference Phase Shift Keying, four-phase relative phase shift keying. The constellation diagram of π / 4DQPSK is composed of two QPSK constellation diagrams with a phase difference of π / 4, so the constellation diagram is exactly the same as 8PSK. But the difference between it and the latter is that the possibility of π / 4DQPSK symbols jumping between constellation points is limited. This limitation is that the phase change caused by each symbol jump can only be {π / 4 , -Π / 4, 3π / 4, -3π / 4} four possibilities, relative to O-QPSK, each phase jump is {π / 2, -π / 2} two possibilities, π / 4DQPSK can change the frequency The utilization rate ...

Embodiment 2

[0051] This embodiment introduces a method for improving frequency efficiency in a shortened 16-ary Orthogonal DSSS sequence, and specifically introduces three shortened technical solutions.

[0052] Corresponding to the original 16-ary Orthogonal DSSS sequence with a length of 32 bits, the use of a shorter 16-ary Orthogonal DSSS sequence can correspondingly improve the spectrum utilization.

[0053] 1) 16-ary Orthogonal DSSS with a length of 16 bits

[0054]

[0055] 2) 16-ary Orthogonal DSSS with a length of 8 bits

[0056]

[0057] 3) 16-ary Orthogonal DSSS with a length of 4 bits, since the data symbol is 4 bits, if the length of the DSSS sequence is 4 bits, it is equivalent to not spreading, and the processing gain of spreading is 0dB, which is equivalent Yu directly treats the data symbols as spread spectrum modulation symbol bit groups and sends them to the modulator for modulation to generate a modulated signal.

Embodiment 3

[0059] The modulation method and spread spectrum mentioned in the present invention can be generated by the following methods:

[0060] Picture 10 Describes a block diagram of a modulator using the present invention, which in turn includes four modules: "information bit to information symbol mapping", "information symbol to chip sequence mapping", "chip to modulation symbol bit grouping" and "baseband signal modulator".

[0061] Among them, "information bit to information symbol mapping" divides a group of 4 physical layer frame bit sequences into information symbols; "information symbol to chip sequence mapping" maps an information symbol into one of 16 candidate chip sequences, code The slice sequences s1, s2...s16 are all the same in length, and their length K is equal to the length of the currently selected 16-aryOrthogonal DSSS spreading sequence, such as Picture 11 . "Chip-to-modulation symbol bit grouping" is a serial-to-parallel conversion of a bit sequence. The input chi...

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Abstract

The invention discloses a method for improving ultralow-power-consumption wireless communication transmission spectral efficiency. The method includes a step of O-QPSK (quadrature phase shift keying) for extension and a step of 16-aryorthogonalDSSS spread spectrum sequence for length reduction. By the method, transmission modulation modes of ultralow-power-consumption wireless communication physical layers are expanded, frequency efficiency is improved, and the data speed which is 8Mbit/s maximally can be provided through different combinations of modulation modes and spread spectrum sequences and is increased by 32 times as compared with the data speed which is 250Kbit/s maximally in a standard of 802.15.42450MHzPHY. The same power utilization rate as the modulation technology in an original standard is kept while transmission frequency efficiency is improved, original equipment complexity and power consumption can be maintained, and frequency spectrum resources can be completely used by ultralow-power-consumption wireless communication while cost and energy consumption are reduced.

Description

Technical field [0001] The invention relates to a method for improving the efficiency of ultra-low power consumption wireless communication transmission spectrum, and belongs to the technical field of wireless communication. Background technique [0002] ZigBee is a two-way wireless communication technology with close range, low complexity, low power consumption, low data rate and low cost. The basis of ZigBee is IEEE 802.15.4, which is a standard of the IEEE Wireless Personal Area Network (PAN) working group and is called the IEEE 802.15.4 (ZigBee) technical standard. The ZigBee Alliance adopted IEEE802.15.4 as its physical layer and media access layer specifications when formulating the ZigBee standard. On its basis, the ZigBee Alliance has formulated data link layer (DLL), network layer (NWK) and application programming interface (APl) specifications, and is responsible for high-level applications, testing and marketing. ZigBee technology will be mainly embedded in consumer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/36H04B1/707
Inventor 李宏李革
Owner ARKMICRO TECH
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