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System for wireless communication

A wireless communication and signal technology, applied in the direction of diversity/multi-antenna system, transmission system, frequency diversity, etc., can solve troublesome problems and achieve the effect of high fail-safe protection, small current demand, and small space demand

Inactive Publication Date: 2009-11-18
SIEMENS AG OESTERR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, this "frequency diversity method" is very complex, since the transmitter according to the prior art must contain a number of complete transmitting devices equal in number to the number of different frequencies used

Method used

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  • System for wireless communication

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Embodiment Construction

[0026] exist figure 1 The frequency spectrum of the signal is shown in , which consists of the intermediate-frequency carrier signal Ft and the two associated sidebands USB and OSB. Such signals are typically used for sideband modulation. The horizontal axis represents the frequency f, and the vertical axis represents the signal level Sig.

[0027] In the system of the invention, this signal is formed as a result of a first modulation of the modulation signal Fmod by the intermediate frequency carrier signal Ft. Suppression of the intermediate frequency carrier signal Ft or the sidebands USB, OSB can be done, but this is not essential to the invention.

[0028] figure 2 The functional connection diagram of the transmitter unit S and the respective generated spectra are shown, wherein the modulation spectrum MS and the mirror band SB of this modulation spectrum MS are transmitted according to the invention. The modulation frequency Fmod is modulated onto the intermediate f...

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Abstract

The invention relates to a system for wireless communication having a transmission unit and at least one reception unit, characterized in that the transmission unit S uses a transmission carrier frequency Flo to transmit a modulated signal which contains not only a modulation spectrum MS but also its mirror band SB, and the reception unit contains means AE in order to take prescribed criteria as a basis for selecting and demodulating either the modulation spectrum MS or its mirror band SB. This makes it possible to attain the advantage that the transmission certainty can be significantly increased in comparison with the situation in which only a modulation spectrum is transmitted, since interfering influences on the transmission path from the transmission unit to a reception unit only rarely affect both the frequency ranges of the modulation spectrum and those of its mirror band.

Description

technical field [0001] The invention relates to a system for wireless communication with a transmitting unit and at least one receiving unit. Background technique [0002] In wireless communication technology interference often occurs due to numerous effects, so methods have been developed for improving transmission reliability. [0003] One of these methods, the so-called "frequency diversity method", improves transmission reliability by simultaneously transmitting the same information on different frequencies. Use is made here of different frequency ranges providing different transmission properties and the effect that interfering signals generally do not involve all frequencies used. The receiver can thus select the frequency which in each case produces the most favorable reception conditions at the location of the receiver. [0004] However, this "frequency diversity method" is very complex, since a transmitter according to the prior art must contain a number of comple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/10H04B7/12
CPCH04B7/12H03D3/002H04B1/302
Inventor W·康拉德J·吉拉P·维思
Owner SIEMENS AG OESTERR
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