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Improvements in data communications

By encoding data into the ratio of two frequency signals to resist Doppler shift, the inefficiency problem caused by Doppler shift in ultrasonic communication systems is solved, enabling higher data transmission rates and more effective bandwidth. use.

Inactive Publication Date: 2009-01-28
SONITOR TECH AS
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Since frequency converters have limited bandwidth, a large ratio of Δf to B represents a loss in the effective data rate that can be achieved according to this scheme

Method used

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  • Improvements in data communications
  • Improvements in data communications
  • Improvements in data communications

Examples

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Embodiment Construction

[0045] Figure 1 shows a simple Multiple Frequency Shift Keying (MFSK) system. The system has an intermediate frequency f c Centered on the available bandwidth W. Therefore, the minimum frequency that can be used is f min = f c -W / 2, the maximum frequency is f max = f c +W / 2.

[0046] This bandwidth is divided into five frequency pairs: f i，0 and f i，1 . In order to transmit the digital signal 1001000 as shown in Figure 1, the transmission frequency is f 1，1 tone to transmit the first bit 1, frequency f 1，1 is the lowest '1' bit frequency among the five frequency pairs. Use the second frequency pair to transmit the next bit '0', so that at frequency f 2，0 to transmit the bit. Using the third frequency pair i.e. at frequency f 3，0 to transmit the next '0' bit. with f 4，1 to transmit the fourth bit '1'. Using the last pair i.e. f 5，0 to transmit the fifth bit '0'. Again using the initial pair i.e. f 1，0 to fire the sixth bit, and so on.

[0047] In order to ma...

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PUM

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Abstract

Data communication apparatus comprising transmission means adapted to transmit data as the ratio of pairs of frequencies between objects that are moving relative to one another. It is particularly applicable to acoustic data communications at ultrasound frequencies in air.

Description

technical field [0001] The invention relates to the transmission of data between objects that move relative to each other, such as a mobile transmitter and a stationary receiver. The invention is particularly, but not exclusively, applicable to acoustic data communication in air at ultrasonic frequencies (frequencies on the order of 40 kilohertz (KHz)). Background technique [0002] WO 03 / 087871 discloses a localization system based on ultrasonic communication capable of determining in which room each of several ultrasonic transmitter tags is located. Each tag emits a specific identification signal which is picked up by one of the receivers provided in each room. [0003] Applicants have discovered that current ultrasonic positioning systems such as these use acoustic data links with severely limited data rates. This limits the update rate and / or the number of objects / people that can be tracked, and in particular limits how accurately fast movements of many people / objects ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B11/00H04B13/02
CPCH04B11/00H04B13/02H04L27/106
Inventor 斯韦勒·霍尔姆鲁内·霍尔姆
Owner SONITOR TECH AS
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