Phase shift keying modulation and demodulation method and equipment

A technology of phase shift keying and modulation method, which is applied in the direction of phase modulation carrier system, etc., and can solve the problems of high implementation complexity, low power efficiency, and high linearity requirements of power amplifiers.

Active Publication Date: 2020-06-05
NANJING ZGMICRO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Signals with a high peak-to-average power ratio place high demands on the linearity of the power amplifier, resulting in high implementation complexity and low power efficiency

Method used

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  • Phase shift keying modulation and demodulation method and equipment
  • Phase shift keying modulation and demodulation method and equipment
  • Phase shift keying modulation and demodulation method and equipment

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0124] In this embodiment, the phase function of CECP PSK modulation is defined as follows:

[0125]

[0126] Among them, T is the symbol period.

[0127] In this embodiment, the M of the CECP PSK is 2, 4, and 8, corresponding to π / 2 BPSK, π / 4 QPSK, and π / 8 8PSK modulation respectively. Binary data stream {b n } And the phase sequence {θ k The mapping relationship of} is as follows: Tab.1, Tab.2, Tab.3.

[0128] bk

θ k

0+π / 2 1-π / 2

[0129] Tab.1π / 2 BPSK mapping table

[0130] b2k

b2k+1

θ k

00+π / 4 01+3π / 4 11-3π / 4 10-π / 4

[0131] Tab.2π / 4 QPSK mapping table

[0132] b3k

b3k+1

b3k+2

θ k

000+π / 8 001+3π / 8 011+5π / 8 010+7π / 8 110-7π / 8 111-5π / 8 101-3π / 8 100-π / 8

[0133] Tab.3π / 8 8PSK mapping table

[0134] In this embodiment, the data packet format using the CECP PSK modulation method of the present invention is as follows figure 2 Shown. As shown in the figure, it includes the preamble symbol, synchronization word, packet header, and data payload. As a preferred embodiment, the prea...

no. 2 example

[0139] In addition to the I / Q quadrature modulation (phase modulation) in the above embodiment, in this embodiment, the transmitter implements the modulation idea of ​​the present invention by frequency modulation, including direct frequency modulation or frequency two-point modulation (I / Q )method. Specifically, the phase of the signal obtained by using the phase shift keying modulation method of the present invention in EQ.01 Find the derivative, namely:

[0140]

[0141] The derivative function is a frequency function, and the baseband signal is modulated using a frequency modulation method using f(t). The transmitter structure using direct frequency modulation or two-point modulation is as follows: image 3 Shown, including microprocessor and memory, digital baseband modulator, digital-to-analog converter, radio frequency transmitter and antenna. Microprocessor and memory are used to store and execute programs, process communication protocols, configure and control digital ...

no. 3 example

[0143] In this embodiment, the differential signal in demodulation is Signal component It can be separated. Compared with the foregoing first embodiment, the demodulation method of this embodiment is simpler and has better performance.

[0144] Specifically, based on differential signals Real part signal included And imaginary part signal Demodulate to obtain binary data. In this embodiment, as Figure 4 In the shown receiver adopting the phase shift keying modulation method of the present invention, the method of recovering the transmitted binary data by the digital baseband demodulator is as follows. Rewrite EQ.06 as

[0145]

[0146] among them,

[0147] Use π / 2 BPSK modulation technology to modulate the radio frequency signal to recover binary data b k Valuation The method is as follows,

[0148]

[0149] Use π / 4 QPSK modulation technology to modulate the radio frequency signal to recover binary data b 2k And b 2k+1 Valuation with The method is as follows,

[0150]

[01...

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Abstract

The embodiment of the invention provides a phase shift keying modulation method and a corresponding modem thereof. The method adopts a technology of continuously changing the phase to avoid phase mutation so as to reduce the out-of-band frequency spectrum and improve the frequency spectrum efficiency; and meanwhile, the characteristic of a constant envelope is maintained so as to improve the efficiency of radiofrequency signal power amplification. The corresponding modem modulates the signal by adopting the phase shift keying modulation method, and the corresponding modem modulates the signalby adopting the phase shift keying modulation method.

Description

Technical field [0001] The present invention relates to the field of wireless communication, and more specifically, to a phase shift keying modulation and demodulation method and equipment. Background technique [0002] The Internet of Things is the foundation of the intelligent era, and wireless connection technology is the core of the Internet of Things. With the development of the Internet of Things, various wireless connection technologies have been widely used, such as Classic Bluetooth and Bluetooth Low Energy (BLE). Especially in a large number of sensor and control application fields, people also put forward higher and higher requirements for the power consumption, cost and performance of wireless connection technology. Compared with Classic Bluetooth EDR2 DQPSK modulation technology, the biggest advantage of BLE 2M GFSK modulation technology is that GFSK is a constant envelope modulation technology. The constant envelope modulated radio frequency transmitter has lower ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/22H04L27/20
CPCH04L27/22H04L27/20
Inventor 徐斌
Owner NANJING ZGMICRO CO LTD
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