Single-pulse and multi-pulse transmitted reference impulse radio systems with energy detecting receivers

• US 20060209922A1
• Filed: 02/10/2005
• Published: 09/21/2006
• Est. Priority Date: 01/21/2005
• Status: Active Grant

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Technology Corporation (Renesas Electronics Corporation)
• Inventors: Sahinoglu, Zafer, Gezici, Sinan
• Granted Patent: US 7,729,407 B2
• Time in Patent Office: Days
• US Class Current: 375/130
• CPC Class Codes: H04B 1/71637 Receiver aspects H04B1/7183 takes precedence
• CPC Class Codes: H04B 1/7176 Data mapping, e.g. modulation
• CPC Class Codes: H04B 1/719 Interference-related aspects

Abstract

A transmitted reference ultra-wide band communication signal embodied in an electromagnetic wave and configured to communicate a data value includes a first frame having a first reference pulse and a first data pulse. The first reference pulse has a reference polarity and the first data pulse has a data polarity. The first reference pulse is separated from the first reference pulse by a delay time. The reference polarity is set based on a predetermined reference value and a first pseudo-random polarity code sequence, and the data polarity is set based on the data value and a second pseudo-random polarity code sequence. A receiver configured to receive the signal, a transmitter configured to transmit the signal, and a system of transmitters and receivers are also provided.

Claims

1. A transmitted reference ultra-wide band communication signal embodied in an electromagnetic wave and configured to communicate a data value, said signal comprising:

a first frame having a first reference pulse and a first data pulse, said first reference pulse having a reference polarity, and said first data pulse having a data polarity and being separated from said first reference pulse by a delay time;

said reference polarity being set based on a predetermined reference value and a first pseudo-random polarity code sequence; and

said data polarity being set based on the data value and a second pseudo-random polarity code sequence.

2. The signal of claim 1, wherein a waveform shape of said first data pulse is different from a waveform shape of said first reference pulse.

3. The signal of claim 1, wherein the first data pulse precedes the first reference pulse by the delay time.

4. The signal of claim 1, further comprising a second frame having a second data pulse and a second reference pulse, said first data pulse being configured to either precede or follow the first reference pulse by the delay time based on an ordering relationship between the first frame and the second frame.

5. The signal of claim 1, wherein said first frame is included in a sequence of other frames, each other frame having an other data pulse and an other reference pulse, said first data pulse being configured to either precede or follow the first reference pulse by the delay time based on an ordering relationship of the first frame in the sequence of other frames.

6. The signal of claim 1, wherein the first pseudo-random sequence is different from the second pseudo-random sequence.

7. A transmitted reference ultra-wide band communication signal receiver comprising:

a matched filter configured to filter a received signal and to produce a filtered signal, said matched filter having a predetermined impulse response that is an inverse of a template signal, said template signal including a first template pulse having a polarity based on a first pseudo-random sequence and corresponding to a data pulse in the received signal and a second template pulse having a polarity based on a second pseudo-random sequence and corresponding to a reference pulse in the received signal;

an energy detector operatively connected to the matched filter and configured to detect energy in the filtered signal and to produce a detected energy signal; and

a decision unit operatively connected to the energy detector and configured to determine a value of data in the received signal based on the detected energy signal.

8. The receiver of claim 7, wherein the first pseudo-random sequence is different than the second pseudo-random sequence.

9. A transmitted reference ultra-wide band communication signal receiver comprising:

a first matched filter configured to filter a received signal and produce a first filtered signal, said first matched filter having a first impulse response that is an inverse of a first template signal, said first template signal including a first template pulse having a predetermined wave shape the same as the wave shape of a first data pulse in the received signal;

a first energy detector operatively connected to the first matched filter and configured to detect energy in the first filtered signal and produce a first detected energy signal;

a second matched filter configured to filter the received signal and produce a second filtered signal, said second matched filter having a second impulse response that is an inverse of a second template signal, said second template signal including a second template pulse having a wave shape the same as the wave shape of a first reference pulse in the received signal;

a second energy detector operatively connected to the second matched filter and configured to detect energy in the second filtered signal and produce a second detected energy signal; and

a decision unit operatively connected to the first and second energy detectors and configured to determine a value of data in the received signal based on the first and second detected energy signals.

10. The receiver of claim 9, wherein a polarity of said first template pulse is based on a first pseudo-random sequence and a polarity of said second template pulse is based on a second pseudo-random sequence.

11. The receiver of claim 10, wherein the first pseudo-random sequence is different than the second pseudo-random sequence.

12. A transmitted reference ultra-wide band communication signal receiver comprising:

a matched filter configured to filter a received signal and to produce a filtered signal, said matched filter having an impulse response that is an inverse of a template signal, said template signal including a sequence of template frames, each template frame in the sequence having a first template pulse corresponding to a data pulse in the received signal and a second template pulse corresponding to a reference pulse in the received signal, each first template pulse of each template frame being configured to either precede or follow the corresponding second template pulse of the template frame by a delay time based on an ordering relationship of the template frame in the sequence of template frames;

an energy detector operatively connected to the matched filter and configured to detect energy in the filtered signal and to produce a detected energy signal; and

a decision unit operatively connected to the energy detector and configured to determine a value of data in the received signal based on the detected energy signal.

13. The receiver of claim 12, wherein a polarity of said first template pulse is based on a first pseudo-random sequence and a polarity of said second template pulse is based on a second pseudo-random sequence.

14. The receiver of claim 13, wherein the first pseudo-random sequence is different than the second pseudo-random sequence.

15. A transmitted reference ultra-wide band communication signal transmitter comprising:

a pulse generator configured to produce a data pulse and a reference pulse;

a delay unit operatively connected to the pulse generator and configured to delay the data pulse and to delay the reference pulse;

a polarity code generator configured to generate a first pseudo-random polarity code for the data pulse and a second pseudo-random polarity code for the reference pulse;

an information bit source configured to provide an information bit for the data pulse;

a multiplier operatively connected to the polarity code generator, the information bit source and the delay unit, said multiplier configured to multiply the first pseudo-random polarity code, the delayed data pulse and the information bit to produce an encoded data pulse and to multiply the second pseudo-random polarity code and the delayed reference pulse to produce an encoded reference pulse;

a power control unit operatively connected to the multiplier and configured to control a power of the encoded data pulse and the encoded reference pulse; and

an antenna operatively connected to the power control unit and configured to broadcast the power controlled encoded data and reference pulses.

16. The transmitter of claim 15, wherein the first pseudo-random sequence is different than the second pseudo-random sequence.

17. The transmitter of claim 15, wherein a wave shape of the data pulse generated by the pulse generator is different than a wave shape of the reference pulse generated by the pulse generator.

18. The transmitter of claim 15, wherein the pulse generator is further configured to generate a sequence of frames, each frame including a data pulse and a reference pulse, and said data pulse in each frame being configured to either precede or follow the corresponding reference pulse of the frame based on an ordering relationship of the respective frame in the sequence of frames.

19. A transmitted reference ultra-wide band communication system comprising:

a transmitter comprising

a pulse generator configured to produce a data pulse and a reference pulse,

a delay unit operatively connected to the pulse generator and configured to delay the data pulse and to delay the reference pulse,

a polarity code generator configured to generate a first pseudo-random polarity code for the data pulse and a second pseudo-random polarity code for the reference pulse,

an information bit source configured to provide an information bit for the data pulse,

a multiplier operatively connected to the polarity code generator, the information bit source and the delay unit, said multiplier configured to multiply the first pseudo-random polarity code, the delayed data pulse and the information bit to produce an encoded data pulse and to multiply the second pseudo-random polarity code and the delayed reference pulse to produce an encoded reference pulse,

a power control unit operatively connected to the multiplier and configured to control a power of the encoded data pulse and the encoded reference pulse, and

an antenna operatively connected to the power control unit and configured to broadcast the power controlled encoded data and reference pulses; and

a receiver comprising

a matched filter configured to filter a received signal and to produce a filtered signal, said matched filter having a predetermined impulse response that is an inverse of a template signal, said template signal including a first template pulse having a polarity based on a first pseudo-random sequence and corresponding to a data pulse in the received signal and a second template pulse having a polarity based on a second pseudo-random sequence and corresponding to a reference pulse in the received signal,

an energy detector operatively connected to the matched filter and configured to detect energy in the filtered signal and to produce a detected energy signal, and

a decision unit operatively connected to the energy detector and configured to determine a value of data in the received signal based on the detected energy signal.

20. A transmitted reference ultra-wide band communication system comprising:

a transmitter comprising

a pulse generator configured to produce a data pulse and a reference pulse,

a delay unit operatively connected to the pulse generator and configured to delay the data pulse and to delay the reference pulse,

a polarity code generator configured to generate a first pseudo-random polarity code for the data pulse and a second pseudo-random polarity code for the reference pulse,

an information bit source configured to provide an information bit for the data pulse,

a multiplier operatively connected to the polarity code generator, the information bit source and the delay unit, said multiplier configured to multiply the first pseudo-random polarity code, the delayed data pulse and the information bit to produce an encoded data pulse and to multiply the second pseudo-random polarity code and the delayed reference pulse to produce an encoded reference pulse,

a power control unit operatively connected to the multiplier and configured to control a power of the encoded data pulse and the encoded reference pulse, and

an antenna operatively connected to the power control unit and configured to broadcast the power controlled encoded data and reference pulses; and

a receiver comprising

a first matched filter configured to filter a received signal and produce a first filtered signal, said first matched filter having a first impulse response that is an inverse of a first template signal, said first template signal including a first template pulse having a predetermined wave shape the same as the wave shape of a first data pulse in the received signal,

a first energy detector operatively connected to the first matched filter and configured to detect energy in the first filtered signal and produce a first detected energy signal,

a second matched filter configured to filter the received signal and produce a second filtered signal, said second matched filter having a second impulse response that is an inverse of a second template signal, said second template signal including a second template pulse having a wave shape the same as the wave shape of a first reference pulse in the received signal,

a second energy detector operatively connected to the second matched filter and configured to detect energy in the second filtered signal and produce a second detected energy signal, and

a decision unit operatively connected to the first and second energy detectors and configured to determine a value of data in the received signal based on the first and second detected energy signals.

21. A transmitted reference ultra-wide band communication system comprising:

a transmitter comprising

a pulse generator configured to produce a data pulse and a reference pulse,

a delay unit operatively connected to the pulse generator and configured to delay the data pulse and to delay the reference pulse,

a polarity code generator configured to generate a first pseudo-random polarity code for the data pulse and a second pseudo-random polarity code for the reference pulse,

an information bit source configured to provide an information bit for the data pulse,

a multiplier operatively connected to the polarity code generator, the information bit source and the delay unit, said multiplier configured to multiply the first pseudo-random polarity code, the delayed data pulse and the information bit to produce an encoded data pulse and to multiply the second pseudo-random polarity code and the delayed reference pulse to produce an encoded reference pulse,

a power control unit operatively connected to the multiplier and configured to control a power of the encoded data pulse and the encoded reference pulse, and

an antenna operatively connected to the power control unit and configured to broadcast the power controlled encoded data and reference pulses; and

a receiver comprising

a matched filter configured to filter a received signal and to produce a filtered signal, said matched filter having an impulse response that is an inverse of a template signal, said template signal including a sequence of template frames, each template frame in the sequence having a first template pulse corresponding to a data pulse in the received signal and a second template pulse corresponding to a reference pulse in the received signal, each first template pulse of each template frame being configured to either precede or follow the corresponding second template pulse of the template frame by a delay time based on an ordering relationship of the template frame in the sequence of template frames,

an energy detector operatively connected to the matched filter and configured to detect energy in the filtered signal and to produce a detected energy signal, and

a decision unit operatively connected to the energy detector and configured to determine a value of data in the received signal based on the detected energy signal.