Pulse or digital communications – Transceivers – Modems
Patent
1995-10-27
1999-03-16
Pham, Chi H.
Pulse or digital communications
Transceivers
Modems
375306, 375334, 375343, H04B 138, H03C 306, H03D 300, H03D 102
Patent
active
058839224
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to communication devices used to connect computers, for example personal computers, in networks. This device performs the function of an interface between the computer and the communication channel utilised for the network. This channel can be a physical channel, for example a coaxial cable or an optical fibre, or space in the case of the so-called wire less or cordless type of network in which the communication takes place by means of radio waves.
BACKGROUND ART
A device of this kind, known in the art, is disclosed for example in U.S. Pat. No. 9,682,344.
The device according to the present invention has been developed particularly, although not exclusively, for use in cordless local area networks, and in the specific embodiment to operate according to the ETS 300-175 standard.
Communication devices of the said type are known in the art, however they have one or more disadvantages such as, for example, sensitivity to disturbances, high cost, circuit complexity and others.
SUMMARY OF THE INVENTION
The object of the present invention is that of providing a simpler and less expensive communication device than the prior art devices whilst providing optimum performance.
According to the present invention this object is achieved by a communication device having the characteristics indicated in the claims which follow the present description.
BRIEF DESCRIPTION OF THE DRAWINGS
Further advantages and characteristics of the present invention will become apparent from the following detailed description, in which reference is made to the attached drawings, provided purely by way of non-limitative example, in which:
FIG. 1 schematically illustrates a communication device for computer networks;
FIG. 2 is a block schematic diagram of an embodiment of the device according to the present invention;
FIG. 3 is a block schematic diagram of an alternative embodiment of the device according to the present invention; and
FIG. 4 is a block schematic diagram of a portion of the device shown in FIGS. 2 and 3.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIG. 1 is shown a generic communication device of the type described hereinabove. The device 1 communicates, via a digital communication channel of a type which is widely known, with a computer not illustrated. This channel is bi-directional such that it allows the transmission of input digital data, indicated DDI from the computer to the device 1 and the transmission of output digital data, indicated DDO from the device 1 to the computer.
The device communicates with other identical or compatible devices, still in a bi-directional manner, by means of radio waves using an antenna A.
In a possible embodiment it may be found convenient to use two antenna so as to be able to exploit the technology know as "space diversity".
In FIG. 2 is shown the high level architecture of an embodiment of the device 1 according to the present invention.
The input digital data DDI constitutes the input of a modulator, indicated MOD, which generates a modulated signal at its output. This modulated signal enters a mixer MIX1 which raises its frequency by utilising a fixed frequency signal produced by a local oscillator LOC. The high frequency modulated signal at the output from the mixer MIX1 then passes through a ceramic filter F1 after which it is amplified by the power amplifier AMP.
The amplified signal is sent to a commutation unit, indicated C, which sends it to an antenna A through which the signal is thus transmitted via radio.
What has been just described is the transmitter section of the device 1, the receiver section is similar, having a complementary structure. The radio signals received by the antenna A are sent via the commutation unit C to a receiver preamplifier indicated PRE. The received signals, thus preamplified, pass through a ceramic filter F2 and are applied to the input of a mixer MIX2. In the mixer MIX2 the signals are converted to a lower frequency by utilising the same local oscillator LOC as was used in the transm
REFERENCES:
patent: 3803354 (1974-04-01), Bennett
patent: 4311971 (1982-01-01), La Rosa
patent: 4368439 (1983-01-01), Shibuya et al.
patent: 4682344 (1987-07-01), Somer
IBM Technical Disclosure Bulletin., vol. 13, No. 10, Mar. 1971, New York US, pp. 2912-2913, A. Croisier et al. "Frequency-Shift Signal Generator".
Electronics & Wireless World, vol. 92, No. 1610, Dec. 1986, Surrey GB, p. 95, "Working Both Ways".
Bud Andrew
Campi Luciano
Straullu Franco
Luther William
Olivetti Telemedia S.p.A.
Pham Chi H.
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