Method for radio transmission by ultra wideband transmission

• US 9,337,888 B2
• Filed: 06/20/2013
• Issued: 05/10/2016
• Est. Priority Date: 07/19/2012
• Status: Active Grant

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Glnzer, Ulrike, Httner, Jrg
• Primary Examiner(s): Lugo, David B.
• Application Number:
  US14/415,517
• Publication Number:
  US 20150229351A1
• Time in Patent Office: 1,055 Days
• Field of Search: 375/130, 375/138
• US Class Current: 1/1
• CPC Class Codes: H04B 1/71 the interference being narrowband interference
• CPC Class Codes: H04B 1/71637 Receiver aspects H04B1/7183 takes precedence
• CPC Class Codes: H04L 25/4902 Pulse width modulation; Pulse position modulation
• CPC Class Codes: H04L 27/2032 for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner

Abstract

Message symbols are sent radio transmission using an ultra wideband transmitter emitting a pulse-phase-modulated transmission signal that has isolated pulses, each of which has a time offset in relation to a time pattern, which time offset is dependent on a message symbol that the pulse represents. The transmission signal has a line spectrum having a multiplicity of modulated frequency lines. The transmission signal is received at a receiver, which obtains a narrowband signal from a single one of the modulated frequency lines. The modulated frequency line includes a bandwidth that corresponds to less than twice a pattern frequency of the time pattern. A phase of the narrowband signal is ascertained at predetermined instants and the respectively ascertained phase is associated with one of a plurality of predetermined message symbols.

Claims

1. A method for radio transmission of message symbols by an ultra wideband transmitter emitting a pulse-phase-modulated transmission signal that includes isolated pulses, each pulse having a time offset, in relation to a time pattern, that is dependent on a message symbol that the pulse represents, the pulse-phase-modulated transmission signal having a line spectrum with multiple frequency lines, said method comprising:

receiving the pulse-phase-modulated transmission signal by a receiver;

producing, by the receiver, a reference signal having a reference phase;

obtaining, by the receiver, a narrowband signal from a modulated frequency line of the line spectrum, the narrowband signal having a bandwidth corresponding to less than twice a pattern frequency of the time pattern;

ascertaining, by the receiver at predetermined instants, a phase of the narrowband signal from a sinusoidal signal from a further frequency line of the line spectrum, based on the reference signal; and

associating each phase ascertained by the receiver with one of a plurality of predetermined message symbols.

2. The method as claimed in claim 1, wherein said ascertaining comprises demodulating the narrowband signal to a baseband.

3. The method as claimed in claim 2, further comprising evaluating the narrowband signal from a modulated frequency line having a center frequency that is an uneven multiple of the pattern frequency.

4. The method as claimed in claim 3, further comprising transmitting a single message symbol by the ultra wideband transmitter using pulses that have an identical time shift in the time pattern.

5. The method as claimed in claim 4, wherein said transmitting by the ultra wideband transmitter includes emitting the single message symbol encoded as a predetermined train of pulses.

6. The method as claimed in claim 5, further comprising producing, by the receiver, a reference signal having a reference phase for said ascertaining of the phase of the narrowband signal from a sinusoidal signal from a further frequency line of the line spectrum.

7. The method as claimed in claim 6, wherein the further frequency line has a frequency that is an even multiple of a frame frequency.

8. The method as claimed in claim 7, further comprising, by the receiver prior to said obtaining,

checking modulated frequency lines in the line spectrum for signal quality based on at least one of signal-to-noise ratio and signal power;

and

selecting the modulated frequency line, from among the modulated frequency lines, for which the signal quality exceeds a predetermined threshold value.

9. The method as claimed in claim 8, further comprising:

ascertaining a further phase of a further narrowband signal from at least one further modulated frequency line of the line spectrum;

reconstructing a further message symbol from each further phase; and

determining, from all reconstructed message symbols, the single message symbol sent by the ultra wideband transmitter.

10. The method as claimed in claim 1, further comprising evaluating the narrowband signal from a modulated frequency line having a center frequency that is an uneven multiple of the pattern frequency.

11. The method as claimed in claim 1, further comprising transmitting a single message symbol by the ultra wideband transmitter using pulses that have an identical time shift in the time pattern.

12. The method as claimed in claim 1, wherein said transmitting by the ultra wideband transmitter includes emitting the single message symbol encoded as a predetermined train of pulses.

13. The method as claimed in claim 1, wherein the further frequency line has a frequency that is an even multiple of a frame frequency.

14. The method as claimed in claim 1, further comprising, by the receiver prior to said obtaining,

checking modulated frequency lines in the line spectrum for signal quality based on at least one of signal-to-noise ratio and signal power;

and

selecting the modulated frequency line, from among the modulated frequency lines, for which the signal quality exceeds a predetermined threshold value.

15. The method as claimed in claim 1, further comprising:

ascertaining a further phase of a further narrowband signal from at least one further modulated frequency line of the line spectrum;

reconstructing a further message symbol from each further phase; and

determining, from all reconstructed message symbols, a single message symbol sent by the ultra wideband transmitter.

16. A system for radio transmission of message symbols, comprising:

an ultra wideband transmitter producing a wideband transmission signal from the message symbols by pulse phase modulation; and

a receiver receiving the wideband transmission signal, producing a reference signal having a reference phase and reconstructing the message symbols from the wideband transmission signal by obtaining, from a modulated frequency line of a line spectrum of the wideband transmission signal, a narrowband signal having a bandwidth corresponding to less than twice a pattern frequency of a time pattern of the pulse phase modulation;

ascertaining, at predetermined instants, a phase of the narrowband signal from a sinusoidal signal from a further frequency line of the line spectrum, based on the reference signal; and

associating a message symbol with each phase that is ascertained.

17. A receiver in a system for radio transmission of message symbols, comprising:

an interface receiving a pulse-phase-modulated transmission signal having a line spectrum with a multiplicity of frequency lines altered by the pulse modulation; and

at least one processor programmed to reconstruct message symbols from the pulse-phase-modulated transmission signal received by said interface by

obtaining, from the pulse-phase-modulated transmission signal received by said interface, a narrowband signal including a modulated frequency line of the line spectrum of the pulse-phase-modulated transmission signal and having a bandwidth corresponding to less than twice a pattern frequency of a time pattern of the pulse phase modulation;

ascertaining, at predetermined instants, an ascertained phase of the narrowband signal;

forming a reference phase from a sinusoidal signal from another frequency line of the line spectrum;

comparing the ascertained phase with the reference phase to determine a phase difference value for a phase shift in the narrowband signal in relation to the sinusoidal signal; and

associating the phase difference value with one of a plurality of predetermined message symbols.