Extended binary phase shift keying (EBPSK) modem and implementation method thereof

A binary phase shift keying and modem technology, applied in the field of digital information transmission, can solve the problems of high price, large volume, high power consumption, etc.

Inactive Publication Date: 2011-04-13
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] Digital-to-analog converter (DAC) and analog-to-digital converter (ADC) are the basic functional modules

Method used

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  • Extended binary phase shift keying (EBPSK) modem and implementation method thereof
  • Extended binary phase shift keying (EBPSK) modem and implementation method thereof
  • Extended binary phase shift keying (EBPSK) modem and implementation method thereof

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Embodiment Construction

[0084] The technical solution will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0085] Based on the above derivation process,

[0086] The implementation method of an extended binary phase-shift keying modem of this technical solution adopts simplified EBPSK modulation of θ=π at the transmitting end of the extended binary phase-shift keying EBPSK modem, and adopts a digital shock filter based on the receiving end The demodulator of the device;

[0087] Modulation terminal:

[0088] The expression for the EBPSK modulated waveform is simplified to:

[0089] Among them, s 0 (t) and s 1 (t) represent the modulation waveforms of symbols "0" and "1" respectively, T is the symbol period, τ is the keying modulation period, ω c is the angular frequency of the modulated carrier;

[0090] And in this simplified expression, only take these 3 situations of B=A, B=0 or A=0;

[0091] Demodulator:

[0092] Use the analog signal...

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Abstract

The invention provides an extended binary phase shift keying (EBPSK) modem and an implementation method thereof. In the method, a DAC (digital-to-analog converter) on a modulation end is saved by means of simplified expression of an EBPSK modulation waveform; and by adopting a special filtering mechanism that a digital impact filter can convert phase jump of a pulse signal into amplitude impact, an analog comparator is used to replace a high-precision ADC (analog-to-digital converter) at a demodulation end, thus greatly simplifying a hardware structure of the EBPSK modem, obviously lowering cost, volume and power consumption of an EBPSK receiver and effectively improving the operating frequency and the transmission code rate of the EBPSK. The invention is particularly applicable to a wireless sensor network with high requirements for cost and power consumption.

Description

technical field [0001] The present invention is a simplified realization method for an extended binary phase shift keying (EBPSK) modem (MODEM), and the modem realized by the method. The invention can save expensive digital-to-analog converter (DAC) and analog-to-digital converter (ADC), and belongs to the technical field of digital information transmission. Background technique [0002] 1. Extended binary phase shift keying modulation [0003] In a digital communication system, the process of moving the baseband signal representing binary data up to a given transmission frequency band is called modulation, and the opposite process is called demodulation. Binary digital modulation in communication can directly change a certain parameter (such as amplitude, frequency, phase, etc.) ) to achieve, correspondingly obtain binary (binary) amplitude shift keying (2-ASK), frequency shift keying (2-FSK) and phase shift keying (2-PSK) modulation signals. These binary offset keying m...

Claims

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Application Information

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IPC IPC(8): H04L27/20H04L27/22
Inventor 吴乐南应鹏魁
Owner SOUTHEAST UNIV
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