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

• US 7,729,407 B2
• Filed: 02/10/2005
• Issued: 06/01/2010
• Est. Priority Date: 01/21/2005
• Status: Expired due to Fees

• Current Assignee: Renesas Electronics Corporation
• Original Assignee: Renesas Technology Corporation (Renesas Electronics Corporation)
• Inventors: Gezici, Sinan, Sahinoglu, Zafer
• Primary Examiner(s): Liu; Shuwang
• Assistant Examiner(s): Timory; Kabir A
• Application Number:
  US11/054,318
• Publication Number:
  US 20060209922A1
• Time in Patent Office: 1,937 Days
• Field of Search: 375/130, 375/138, 375/351, 375/147, 375/340
• US Class Current: 375/138
• 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 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 value of +1 or −

1, with equal probability, 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 value of +1 or −

1, with equal probability, 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 by estimating information bit based on the detected energy signal and the first pseudo-random sequence and the second pseudo-random sequence corresponding to an encoded data pulse and an encoded reference pulse, respectively, where estimating the information bit is obtained by comparing decision variables to a threshold, in the received signal.

2. The receiver of claim 1, wherein the first pseudo-random sequence is different than the second pseudo-random sequence.

3. 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 polarity value of +1 or −

1, with equal probability, based on a first pseudo-random sequence and 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 polarity value of +1 or −

1, with equal probability, based on a second pseudo-random sequence and 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 by estimating information bit based on the first and second detected energy signals and the first pseudo-random sequence and the second pseudo-random sequence corresponding to an encoded first data pulse and an encoded reference pulse, respectively, where estimating the information bit is obtained by comparing combines decision variables to a threshold, in the received signal.

4. The receiver of claim 3, wherein the first pseudo-random sequence is different than the second pseudo-random sequence.

5. 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, the first template pulse having a polarity value of +1 or −

1, with equal probability, based on a first pseudo-random sequence, and a second template pulse corresponding to a reference pulse in the received signal, the second template pulse having a polarity value of +1 or −

1, with equal probability, based on a second pseudo-random sequence, 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 by estimating information bit based on the detected energy signals and the first pseudo-random sequence and the second pseudo-random sequence corresponding to an encoded data pulse and an encoded reference pulse, respectively, where estimating the information bit is obtained by comparing decision variables to a threshold, in the received signal.

6. The receiver of claim 5, wherein the first pseudo-random sequence is different than the second pseudo-random sequence.

7. 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 a timing unit and configured to delay the data pulse and to delay the reference pulse based on a control signal received from the timing unit, wherein the timing unit configured to control a time delay between the reference pulse and the data pulse and also a frame starting and ending instants;

a polarity code generator configured to generate a first pseudo-random polarity code sequence, which specifies polarity values of +1 and −

1, with equal probability, according to a first pseudo-random code, for the data pulse and a second pseudo-random polarity code sequence, which specifies polarity values of +1 and −

1, with equal probability, according to a second pseudo-random 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 sequence, the delayed data pulse and the information bit to produce a pseudo-randomly encoded data pulse and to multiply the second pseudo-random polarity code sequence and the delayed reference pulse to produce a pseudo-randomly 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.

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

9. The transmitter of claim 7, 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.

10. The transmitter of claim 7, 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.

11. 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 a timing unit and configured to delay the data pulse and to delay the reference pulse based on a control signal received from the timing unit, wherein the timing unit configured to control a time delay between the reference pulse and the data pulse and also a frame starting and ending instants,

a polarity code generator configured to generate a first pseudo-random polarity code sequence, which specifies polarity values of +1 and −

1 with equal probability according to a first pseudo-random code, for the data pulse and a second pseudo-random polarity code sequence, which specifies polarity values of +1 and −

1 with equal probability according to a second pseudo-random 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 sequence, the delayed data pulse and the information bit to produce a pseudo-randomly encoded data pulse and to multiply the second pseudo-random polarity code sequence and the delayed reference pulse to produce a pseudo-randomly 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 the first pseudo-random polarity code sequence and corresponding to a data pulse in the received signal and a second template pulse having a polarity based on the second pseudo-random polarity code 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 by estimating information bit based on the detected energy signal and the first pseudo-random sequence and the second pseudo-random sequence corresponding to an encoded data pulse and an encoded reference pulse, respectively, where estimating the information bit is obtained by comparing decision variables to a threshold, in the received signal.

12. 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 a timing unit and configured to delay the data pulse and to delay the reference pulse based on a control signal received from the timing unit, wherein the timing unit configured to control a time delay between the reference pulse and the data pulse and also a frame starting and ending instants,

a polarity code generator configured to generate a first pseudo-random polarity code sequence, which specifies polarity values of +1 and −

1 with equal probability according to a first pseudo-random code, for the data pulse and a second pseudo-random polarity code sequence, which specifies polarity values of +1 and −

1 with equal probability according to a second pseudo-random 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 sequence, the delayed data pulse and the information bit to produce a pseudo-randomly encoded data pulse and to multiply the second pseudo-random polarity code sequence and the delayed reference pulse to produce a pseudo-randomly 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 estimating information bit based on the first and the second detected energy signals and the first pseudo-random sequence and the second pseudo-random sequence corresponding to an encoded data pulse and an encoded reference pulse, respectively, where estimating the information bit is obtained by comparing combined decision variables to a threshold, in the received signal.

13. 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 a timing unit and configured to delay the data pulse and to delay the reference pulse based on a control signal received from the timing unit, wherein the timing unit configured to control a time delay between the reference pulse and the data pulse and also a frame starting and ending instants,

a polarity code generator configured to generate a first pseudo-random polarity code sequence, which specifies polarity values of +1 and −

1 with equal probability according to a first pseudo-random code, for the data pulse and a second pseudo-random polarity code sequence, which specifies polarity values of +1 and −

1 with equal probability according to a second pseudo-random 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 sequence, the delayed data pulse and the information bit to produce a pseudo-randomly encoded data pulse and to multiply the second pseudo-random polarity code sequence and the delayed reference pulse to produce a pseudo-randomly 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 by estimating information bit based on the detected energy signal and the first pseudo-random sequence and the second pseudo-random sequence corresponding to an encoded data pulse and an encoded reference pulse, respectively, where estimating the information bit is obtained by comparing decision variables to a threshold, in the received signal.