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

CN102664861AActive Publication Date: 2012-09-12ARKMICRO TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-09-12

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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.
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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 ...

Examples

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...