Method for transmitting data packets on carrier frequency with linear variation and transmitter implementing this method

a data packet and carrier frequency technology, applied in the field of transmission, can solve the problems of scarce practicality and the inability to optimally use the frequency band, and achieve the effect of improving the transmission conditions

Inactive Publication Date: 2012-01-24
XYLON LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]The invention lies within the realm of the transmission of the field on a carrier frequency which varies. The purpose of the invention is to improve the conditions of transmission, in particular as regards the spreading of the spectrum, the bit rate and the ease of exploitation.

Problems solved by technology

It is known practice, utilizing a given frequency band for transmitting packets in a network, to define various transmission channels within the band and to allocate them to the transmitters of the network, either in a predetermined manner or on the basis of the transmission requirements; it turns out that such a method does not allow optimal use of the frequency band and is scarcely practical especially when a receiver is liable to receive packets on any of the channels and must therefore monitor the transmission of packets on all the channels.

Method used

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  • Method for transmitting data packets on carrier frequency with linear variation and transmitter implementing this method
  • Method for transmitting data packets on carrier frequency with linear variation and transmitter implementing this method
  • Method for transmitting data packets on carrier frequency with linear variation and transmitter implementing this method

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Embodiment Construction

[0017]In the diagrams, the devices for accurate synchronization, which come within commonplace technology, have not been represented so as to make the drawings clearer and to simplify the account.

[0018]FIG. 1 is a diagrammatic chart showing how, within the realm of the invention, two successive data packets are transmitted. Each packet comprises a header E1, E2 followed by an information field C1, C2.

[0019]The header is transmitted on a fixed carrier frequency Fe and occupies a transmission channel whose limits are two frequencies F0, F1.

[0020]The information field is transmitted simultaneously in four subcarriers which modulate a carrier Fc and this carrier has a ramp-like variation, that is to say the value of its frequency is a linear function of time t; in FIG. 1 four ramps Fc+fo, Fc+2fo, Fc+3fo, Fc+4fo constitute a symbolic representation of each of the information fields C1 and C2.

[0021]The information field thus occupies a frequency channel of constant width, which moves cont...

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PUM

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Abstract

A method for transmitting data packets having a heading followed by a data field. The data of the field is transmitted by groups of symbols. According to the OFDM technique, subcarriers modulated by the groups are generated. A frequency modulation of a carrier signal delivered by a linear ramp generator is produced with a set of modulated subcarriers. When the signal is received, mixing with a linear ramp results in subcarriers which are separated and then demodulated for supplying data. This is useful for transmitting data packets particularly in wide band networks.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to the transmission, in particular in broadband networks, of data in packets, these packets comprising a header at a first carrier frequency, followed by an information field at a second carrier frequency, the start of transmission of the field being tied to the start of transmission of the header of the corresponding packet.[0003]2. Discussion of the Background[0004]It is known practice to transmit data in packets each comprising a header followed by an information field, the information afforded by the header making it possible, among other things, for the packet to be recognized and taken into account by the parties for whom it is intended.[0005]It is known practice, utilizing a given frequency band for transmitting packets in a network, to define various transmission channels within the band and to allocate them to the transmitters of the network, either in a predetermined manner or on ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04J1/00H04L12/56H04B1/69H04J13/00H04L27/26
CPCH04B1/69H04B2001/6912H04L27/2602
Inventor HETHUIN, SERGERAMEL, LOUIS
Owner XYLON LLC
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