Wireless impulse transmitter, receiver, and method

• US 20030128772A1
• Filed: 07/22/2002
• Published: 07/10/2003
• Est. Priority Date: 07/23/2001
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kohno, Ryuji, Ghavami, Mohammad, Michael, Lachlan
• Granted Patent: US 7,440,505 B2
• Time in Patent Office: Days
• US Class Current: 375/295
• CPC Class Codes: H04B 1/7172 Pulse shape in general H04L25/03834
• CPC Class Codes: H04B 1/7174 Pulse generation in general H04L25/03834
• CPC Class Codes: H04B 1/7183 Synchronisation
• CPC Class Codes: H04L 27/0004 using wavelets
• CPC Class Codes: H04L 5/02 Channels characterised by the type of signal

Abstract

A wireless impulse transmitter that is for transmitting pulse trains to a plurality of receivers, includes a pulse selector, a pulse supplier, and a transmission unit. The pulse selector is for selecting, from a plurality of orthogonal pulse shapes assigned in a two-to-one correspondence with the receivers, pulse shapes corresponding to symbols of an input data stream. Each of the two pulse shapes assigned to each receiver represents either one or zero to the corresponding receiver. The pulse supplier is for supplying pulses in pulse shapes selected by the pulse selector. The transmission unit is for transmitting the pulses supplied from the pulse supplier in pulse trains, wherein pulses with pulse shapes assigned to different receivers are transmitted simultaneously.

Claims

1. A wireless impulse transmitter for transmitting pulse trains to a plurality of receivers, the transmitter comprising:

a pulse selector for selecting, from a plurality of orthogonal pulse shapes assigned in a two-to-one correspondence with the receivers, pulse shapes corresponding to symbols of an input data stream, each of the two pulse shapes assigned to each receiver representing either one or zero to the corresponding receiver;

a pulse supplier for supplying pulses in pulse shapes selected by the pulse selector; and

a transmission unit for transmitting the pulses supplied from the pulse supplier in pulse trains wherein pulses with pulse shapes assigned to different receivers are transmitted simultaneously.

2. A wireless impulse transmitter as claimed in claim 1, wherein the pulse supplier supplies pulse shapes having the same pulse width.

3. A wireless impulse transmitter as claimed in claim 1, wherein the pulse supplier supplies pulse shapes that are based on modified Hermite polynomials.

4. A wireless impulse transmitter as claimed in claim 3, wherein the pulse supplier supplies pulse shapes that are based on modified normalized Hermite polynomials.

5. A wireless impulse receiver comprising:

a receiving unit for receiving a data stream including pulses that have either of two different orthogonal pulse shapes; and

a correlator for distinguishing correspondence between symbols and pulse shapes of the pulses in the data stream received by the receiving unit and outputting symbols that correspond to the pulse shapes in the received data stream.

6. A wireless impulse receiver as claimed in claim 5, further comprising a synchronizing unit that synchronizes timing of reception at the receiving unit with transmission from a plurality of remote transmitters so as to receive pulses that have mutually orthogonal pulse shapes from the plurality of remote transmitters simultaneously.

7. A wireless impulse receiver as claimed in claim 5, wherein the pulse supplier supplies pulse shapes that are based on modified Hermite polynomials.

8. A wireless impulse receiver as claimed in claim 7, wherein the pulse supplier supplies pulse shapes that are based on modified normalized Hermite polynomials.

9. A method for transmitting pulse trains in a wireless transmission to a plurality of receivers, the method comprising:

selecting, from a plurality of orthogonal pulse shapes assigned in a two-to-one correspondence with the receivers, pulse shapes corresponding to symbols of an input data stream, each of the two pulse shapes assigned to each receiver representing either one or zero to the corresponding receiver;

supplying pulses in the selected pulse shapes; and

transmitting the supplied pulses in pulse trains wherein pulses with pulse shapes assigned to different receivers are transmitted simultaneously.

10. A method as claimed in claim 9, wherein pulse shapes are supplied that have the same pulse width.

11. A method as claimed in claim 9, wherein pulse shapes are supplied that are based on modified Hermite polynomials.

12. A method as claimed in claim 11, wherein pulse shapes are supplied that are based on modified normalized Hermite polynomials.