Receiving/backscattering arrangement and method with two modulation modes for wireless data transmission as well as modulation arrangement therefor
First Claim
1. A method of wireless data transmission between a base station and a passive receiving/backscattering unit, comprising the steps:
- a) emitting electromagnetic waves from said base station;
b) receiving said electromagnetic waves as received waves with said receiving/backscattering unit; and
c) modulating and reflecting said received waves as modulated reflected waves by passive backscattering from said receiving/backscattering unit to said base station, wherein said modulating is carried out in accordance with data that are to be transmitted by said passive backscattering from said receiving/backscattering unit to said base station, and wherein said modulating comprises;
c1) phase shift keying when a received field strength of said received waves is in a first field strength range, andc2) amplitude shift keying when said received field strength is in a second field strength range higher than said first field strength range,so as to provide a backscattering distance range of said passive backscattering from said receiving/backscattering unit to said base station that is larger with said phase shift keying than with said amplitude shift keying, and to provide a backscattering transmission quality of said passive backscattering that is higher with said amplitude shift keying than with said phase shift keying.
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Accused Products
Abstract
For transmitting data, a receiving/backscattering arrangement receives, modulates and reflects or backscatters electromagnetic waves emitted by a base station. The modulation corresponds to the data to be transmitted and is carried out selectively using first and/or second different modulation methods depending on the received field strength of the received electromagnetic waves. Preferably, phase shift keying is used especially or at least at low field strengths at far range, while amplitude shift keying is used additionally or alternatively for high field strengths at close range. The two modulation methods can be superimposed. A circuit arrangement includes two different modulator arrangements to perform the two modulation methods depending on the received field strength. The second modulator arrangement preferably comprises a multi-stage voltage multiplier circuit with a modulated switching device intervening in one of the stages to achieve the modulation.
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Citations
13 Claims
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1. A method of wireless data transmission between a base station and a passive receiving/backscattering unit, comprising the steps:
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a) emitting electromagnetic waves from said base station; b) receiving said electromagnetic waves as received waves with said receiving/backscattering unit; and c) modulating and reflecting said received waves as modulated reflected waves by passive backscattering from said receiving/backscattering unit to said base station, wherein said modulating is carried out in accordance with data that are to be transmitted by said passive backscattering from said receiving/backscattering unit to said base station, and wherein said modulating comprises; c1) phase shift keying when a received field strength of said received waves is in a first field strength range, and c2) amplitude shift keying when said received field strength is in a second field strength range higher than said first field strength range, so as to provide a backscattering distance range of said passive backscattering from said receiving/backscattering unit to said base station that is larger with said phase shift keying than with said amplitude shift keying, and to provide a backscattering transmission quality of said passive backscattering that is higher with said amplitude shift keying than with said phase shift keying. - View Dependent Claims (2)
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3. A passive receiving/backscattering arrangement embodied in a passive transponder and adapted to receive electromagnetic waves emitted by a base station and to modulate and reflect said electromagnetic waves by passive backscattering in accordance with data that are to be transmitted by said passive backscattering from said receiving/backscattering arrangement to said base station, wherein said passive receiving/backscattering arrangement comprises:
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a first modulator arrangement that comprises a phase shift keying modulator, and that is adapted to modulate said electromagnetic waves by a first modulation comprising a phase shift keying; and a second modulator arrangement that is different from said first modulator arrangement, and that comprises an amplitude shift keying modulator, and that is adapted to modulate said electromagnetic waves by a second modulation different from said first modulation and comprising an amplitude shift keying; wherein said first modulator arrangement is activatable selectively in response to a received field strength of said electromagnetic waves received by said receiving/backscattering arrangement being in a first field strength range, and said second modulator arrangement is activatable selectively in response to said received field strength being in a second field strength range higher than said first field strength range, so as to provide a backscattering distance range of said passive backscattering from said receiving/backscattering arrangement to said base station that is larger with said phase shift keying than with said amplitude shift keying, and to provide a backscattering transmission quality of said passive backscattering that is higher with said amplitude shift keying than with said phase shift keying. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
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12. A modulator arrangement for amplitude shift keying modulation of received electromagnetic waves according to data that are to be transmitted, comprising:
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a rectifier including a multistage voltage multiplier circuit having plural successive stages; and a controllable switching device having a controlled conduction path connected between a circuit node of one of said stages of said voltage multiplier circuit and a reference potential, and having a control input connected to a control line providing a modulation control signal. - View Dependent Claims (13)
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Specification