Wireless impulse transmitter, receiver, and method

• US 7,440,505 B2
• Filed: 07/22/2002
• Issued: 10/21/2008
• Est. Priority Date: 07/23/2001
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kohno, Ryuji, Michael, Lachlan, Ghavami, Mohammad
• Primary Examiner(s): Ghayour; Mohammad
• Assistant Examiner(s): Panwalkar; Vineeta S
• Application Number:
  US10/200,953
• Publication Number:
  US 20030128772A1
• Time in Patent Office: 2,283 Days
• Field of Search: 375/295, 375/316, 375/260, 375/259, 455/500, 455/130, 370/464
• US Class Current: 375/259
• 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 comprising:

a transmission unit;

a first pulse selector for selecting a first pulse shape or a second pulse shape, the first and second pulse shapes being assigned to a first receiver;

a second pulse selector for selecting a third pulse shape or a fourth pulse shape, the third and fourth pulse shapes being assigned to a second receiver;

a first pulse supplier for supplying the first or second pulse shape to the transmission unit;

a second pulse supplier for supplying the third or fourth pulse shape to the transmission unit;

wherein the transmission unit simultaneously transmits one of the first or second pulse shapes and one of the third or fourth pulse shapes

wherein the first pulse shape is predefined as representing a first data symbol and the second pulse shape is predefined as representing a second data symbol;

wherein the third pulse shape is predefined as representing the first data symbol and the fourth pulse shape is predefined as representing the second data symbol;

wherein the first, second, third, and fourth pulse shapes are mutually orthogonal.

2. The wireless impulse transmitter as claimed in claim 1, wherein the first, second, third, and fourth pulse shapes have the same pulse width.

3. The wireless impulse transmitter as claimed in claim 1, wherein the first, second, third, and fourth pulse shapes are based on modified Hermite polynomials.

4. The wireless impulse transmitter as claimed in claim 3, wherein the first, second, third, and fourth pulse shapes are based on modified normalized Hermite polynomials.

9. The wireless impulse transmitter according to claim 1, wherein the first and third pulse shapes are predefined as representing a one and the second and fourth pulse shapes are predefined as representing a zero.

5. A method comprising:

selecting a first pulse shape or a second pulse shape, the first and second pulse shapes being assigned to a first receiver;

selecting a third pulse shape or a fourth pulse shape, the third and fourth pulse shapes being assigned to a second receiver;

supplying the first or second pulse shape to a transmission unit

supplying the third or fourth pulse shape to the transmission unit; and

simultaneously transmitting one of the first or second pulse shapes and one of the third or fourth pulse shapes;

wherein the first pulse shape is predefined as representing a first data symbol and the second pulse shape is predefined as representing a second data symbol;

wherein the third pulse shape is predefined as representing the first data symbol and the fourth pulse shape is predefined as representing the second data symbol;

wherein the first, second, third, and fourth pulse shapes are mutually orthogonal.

6. The method as claimed in claim 5, wherein the first, second, third, and fourth pulse shapes have the same pulse width.

7. The method as claimed in claim 5, wherein the first, second, third, and fourth pulse shapes are based on modified Hermite polynomials.

8. The method as claimed in claim 7, wherein the first, second, third, and fourth pulse shapes are based on modified normalized Hermite polynomials.

10. The method according to claim 5, wherein the first and third pulse shapes are predefined as representing a one and the second and fourth pulse shapes are predefined as representing a zero.