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Modulating method for Chirp ultra wide band communication system

A technology of ultra-wideband communication and modulation method, applied in the field of communication modulation, can solve the problem of low information transmission efficiency and achieve the effect of increasing transmission efficiency

Inactive Publication Date: 2008-11-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Compared with the DM method, this modulation method does not use QPSK, QAM and other modulation methods, so there is no need for channel estimation at the receiving end, so the demodulation is simple, but because one modulation symbol only transmits 1 bit of information, so Information transmission efficiency is relatively low

Method used

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  • Modulating method for Chirp ultra wide band communication system
  • Modulating method for Chirp ultra wide band communication system
  • Modulating method for Chirp ultra wide band communication system

Examples

Experimental program
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Effect test

example 1

[0027] Such as figure 1 As shown, the process is as follows:

[0028] Step 1: Outputting the serial bit stream by buffering or buffering circuit (101) in groups of two bits;

[0029] Step 2: The two-bit unipolar electrical signal output by the buffer or buffer circuit (101) is converted into two bipolar symbols or bipolar electrical signals by the polarity conversion or polarity conversion circuit (102), and the two Among the two bipolar symbols or bipolar electrical signals, one of them must be a 0 symbol or a 0 level, and the other must be a non-zero symbol or a non-zero level, for example, 11 is converted to 10, 10 is converted to -10; 01 is converted into 01, 00 into 0-1;

[0030] Step 3: Perform serial / transformation (103) on two bipolar modulation symbols or electrical signals, that is, one serial signal becomes two parallel symbol streams or electrical signals, and each bipolar symbol or bipolar electrical signal The duration of 2 bits;

[0031] Step 4: Multiply the b...

example 2

[0035] Such as figure 2 As shown, the modulation process can be divided into 2 steps

[0036] Step 1: the serial bit stream is grouped by two bits through the buffer (205), and the grouped bit pairs are 00, 01, 10 or 11;

[0037] Step 2: each group of bits obtained in step 1 is removed to trigger four selectors (206), and four input terminals of the gates (206) are four different chirp signal generators (201, 202, 203 , 204) are s 1 ,s 2 ,s 3 and s 4 .

[0038] Example of demodulation process:

[0039] Such as image 3 As shown, the demodulation can be composed of the following 9 steps:

[0040] Step 1: Divide the received baseband signal into two outputs, and send one to the up-sweep matched filter h 1 (301), the other way is sent to the down-sweep matched filter h 2 (303); wherein the upper sweep filter h 1 is from m 1 and m 2 Selected in, down-sweep filter h 2 is from m 3 and m 4 select from

[0041] Step 2: Matched filter h 1 The output of (301) is sampl...

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Abstract

The invention provides a modulator approach with 4-ary bi-orthogonal keying (4BOK), which aims at increasing data transmission efficiency and guaranteeing simple realization simultaneously. The modulator approach groups binary data streams to be modulated according to the form that one group comprises two bits (namely, a quaternary number expressed by a binary number), the value collection of each quaternary number is D=[11,10,01,00], and then each signal which is in quaternary number form can be converted to a collection S=[s<1>, s<2>,s<3>,s<4>] by a conversion circuit according to one-to-one correspondence. The modulator approach can provide much higher rate of data transmission capacity and reduces complexity simultaneously.

Description

technical field [0001] The invention relates to a modulation method applied to an ultra-wideband communication system for high-speed wireless communication, and belongs to the technical field of communication modulation. Background technique [0002] Since the definition of UWB is all from the perspective of signal bandwidth, there are many different implementations of UWB. These implementations can be roughly divided into four types of schemes: 1. Ultra-wideband based on Impulse Radio (IR), which uses narrow pulses with extremely low duty cycles instead of sine waves as information carriers; 2. UWB based on Multi Band-Orthogonal Frequency Division Multiplexing (MB-OFDM for short), this scheme uses OFDM technology to make the transmitted signal have a large bandwidth; 3 based on direct sequence-code UWB (Direct Sequence-Code Division Multiple Access, DS-CDMA for short), this scheme uses direct sequence spread spectrum technology to expand the bandwidth of the transmitted si...

Claims

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Application Information

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IPC IPC(8): H04B1/69H04B1/707H04L27/32H04B1/7176
Inventor 刘皓孙嘉
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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