Method and apparatus for transferring and receiving ultra wideband signals using differential phase shift keying scheme

• US 20040223556A1
• Filed: 05/06/2004
• Published: 11/11/2004
• Est. Priority Date: 05/06/2003
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choi, Yun-hwa
• Application Number:
  US10/839,139
• Publication Number:
  US 20040223556A1
• Time in Patent Office: Days
• US Class Current: 375/295
• CPC Class Codes: H04L 27/0004 using wavelets
• CPC Class Codes: H04L 27/205 in which the data are represented by the change in phase of the carrier
• CPC Class Codes: H04L 27/2331 wherein the received signal is demodulated using one or more delayed versions of itself

Abstract

An apparatus and method for transmitting and/or receiving ultra wideband (UWB) signals using differential phase shift keying (DPSK). A UWB transmitter includes a DPSK conversion unit for converting a first bitstream (data stream) by DPSK into a second bitstream, a modulation unit for generating UWB wavelet series based on the second bitstream, allowing the phase difference to be 180 degrees between the bit of 0 and the bit of 1, and an RF module for transmitting the generated UWB wavelet series through a wireless channel. A UWB receiver includes an RF module for receiving UWB wavelet series transmitted through a wireless channel, a time delay unit for delaying the UWB wavelet series received though the RF module for time period corresponding to an inter-pulse space, and a demodulation unit for demodulating data stream based on a correlation of the UWB wavelet series received through the RF module and the delayed UWB wavelet series passing through the time delay unit.

Claims

1. An ultra wideband (UWB) transmitter comprising:

a differential phase shift keying (DPSK) conversion unit for subjecting a first bitstream to DPSK to generate a second bitstream;

a modulation unit for generating a UWB wavelet series based on the second bitstream generated by the DPSK conversion unit, wherein a phase difference between wavelets of the UWB wavelet series is defined as 180 degrees if a bit of the second bitstream is 1 and 0 degrees if the bit of the second bitstream is 0; and

a transmission module for transmitting the UWB wavelet series via a wireless channel.

2. The UWB transmitter as claimed in claim 1, wherein the DPSK conversion unit comprises:

a buffer for storing at least one bit of the first bitstream; and

an operation unit performing an XOR operation on the bit stored in the buffer and a next bit of the first bitstream, and outputting a result of the XOR operation.

3. The UWB transmitter as claimed in claim 1, wherein the transmission module transmits the wavelets of the UWB wavelet series in multiple frequency bands.

4. An ultra wideband (UWB) receiver comprising:

a reception module for receiving a UWB wavelet series transmitted through a wireless channel and outputting the UWB wavelet series;

a time delay unit for delaying the UWB wavelet series output by the reception module for a time period corresponding to an inter-pulse space and outputting a delayed UWB wavelet series; and

a demodulation unit for generating a data stream based on a correlation of the UWB wavelet series output by the reception module and the delayed UWB wavelet series output by the time delay unit.

5. The UWB receiver as claimed in claim 4, wherein the demodulation unit comprises:

a multiplier for multiplying the UWB wavelet series by the delayed UWB wavelet series;

an integration unit for integrating a product of the UWB wavelet series and the delayed UWB wavelet series for a time period corresponding to a UWB inter-pulse space, and outputting an integrated result; and

a bit determination unit for generating bits of the data stream based on the integrated result, wherein a bit of 0 is generated when the integrated result is larger than 0 and a bit of 1 is generated when the integrated result is smaller than 0.

6. The UWB receiver as claimed in claim 5, wherein the time delay unit comprises a transmission line having an electrical length providing a time delay corresponding to the UWB inter-pulse space.

7. The UWB receiver as claimed in claim 4, wherein the UWB wavelet series received by the reception unit is a multiple band UWB wavelet series whose frequency band changes by pulse.

8. An ultra wideband (UWB) transceiver comprising:

a differential phase shift keying (DPSK) conversion unit for subjecting a first bitstream to DPSK to generate a second bitstream;

a modulation unit generating a first UWB wavelet series based on the second bitstream generated by the DPSK conversion unit, wherein a phase difference between wavelets of the first UWB wavelet series is defined as 180 degrees if a bit of the second bitstream is 1 and 0 degrees if the bit of the second bitstream is 0;

an transmission and reception module for transmitting the first UWB wavelet series via a wireless channel, receiving a second UWB wavelet series via the wireless channel, and outputting the second UWB wavelet series;

a time delay unit for delaying the second UWB wavelet series output by the transmission and reception module for a time period corresponding to an inter-pulse space and outputting a delayed UWB wavelet series; and

a demodulation unit for generating a data stream based on a correlation of the second UWB wavelet series output by the transmission and reception module and the delayed UWB wavelet series output by the time delay unit.

9. The UWB transceiver as claimed in claim 8, wherein the DPSK conversion unit comprises:

a buffer for storing at least one bit of the first bitstream therein; and

an operation unit for performing an XOR operation on the bit stored in the buffer and a next bit of the first bit stream, and outputting a result of the XOR operation.

10. The UWB transceiver as claimed in claim 8, wherein the demodulation unit comprises:

a multiplier for multiplying the second UWB wavelet series by the delayed UWB wavelet series;

an integration unit for integrating a product of the second UWB wavelet series and the delayed UWB wavelet series for a time period corresponding to a UWB inter-pulse space, and outputting an integrated result; and

a bit determination unit for generating bits of the data stream based on the integrated result, wherein a bit of 0 is generated when the integrated result is larger than 0 and a bit of 1 is generated when the integrated result is smaller than 0.

11. The UWB transceiver as claimed in claim 10, wherein the time delay unit comprises a transmission line having an electrical length providing a time delay corresponding to a UWB inter-pulse space.

12. The UWB transceiver as claimed in claim 8, wherein the second UWB wavelet series received by the transmission and reception unit is a multiple band UWB wavelet series whose frequency band changes by pulse.

13. A method for transmitting ultra wideband (UWB) signal, the method comprising:

converting a first bitstream into a second bitstream by subjecting the first bitstream to differential phase shift keying (DPSK);

generating a UWB wavelet series based on the second bitstream, wherein a phase difference between wavelets of the UWB wavelet series is defined as 180 degrees if a bit of the second bitstream is 1 and 0 degrees if the bit of the second bitstream is 0; and

transmitting the UWB wavelet series via a wireless channel.

14. The method as claimed in claim 13, wherein the converting step comprises storing at least one bit of the first bitstream in a buffer, performing an XOR operation on the bit stored in the buffer and a next bit of the first bitstream, and outputting a result of the XOR operation.

15. The method as claimed in claim 13, wherein the UWB wavelet series is a multiple band UWB wavelet series whose frequency band changes by pulse.

16. A method for receiving an ultra wideband (UWB) signal, the method comprising:

receiving a UWB wavelet series transmitted via a wireless channel;

delaying the UWB wavelet series for a time period corresponding to an inter-pulse space; and

generating a data stream based on a correlation of the UWB wavelet series and a delayed UWB wavelet series.

17. The method as claimed in claim 16, wherein the generating step comprises:

multiplying the UWB wavelet series by the delayed UWB wavelet series;

integrating a product of the UWB wavelet series and the delayed UWB wavelet series for a time period corresponding to a UWB inter-pulse space to generate an integrated result; and

generating bits of the data stream based on integrated result, wherein a bit of 0 is generated when the integrated result is larger than 0 and a bit of 1 is generated when the integrated result is smaller than 0.

18. The method as claimed in claim 17, wherein the delaying step comprises passing the UWB wavelet series through a transmission line having an electrical length providing a time delay corresponding to the UWB inter-pulse space.

19. The method as claimed in claim 16, wherein the UWB wavelet series received in the receiving step is a multiple band UWB wavelet series whose frequency band changes by pulse.

20. A method for transmitting and receiving ultra wideband (UWB) signals comprising:

converting a first bitstream into a second bitstream by subjecting the first bitstream to differential phase shift keying (DPSK);

generating a first UWB wavelet series based on the second bitstream, wherein a phase difference between wavelets of the first UWB wavelet series is defined as 180 degrees if a bit of the second bitstream is 1 and 0 degrees if the bit of the second bitstream is 0;

transmitting the first UWB wavelet series via a wireless channel;

receiving a second UWB wavelet series via the wireless channel;

delaying the second UWB wavelet series for a time period corresponding to an inter-pulse space; and

generating a data stream based on a correlation of the second UWB wavelet series and a delayed UWB wavelet series.

21. The method as claimed in claim 20, wherein the converting step comprises storing at least one bit of the first bitstream in a buffer, performing an XOR operation on the bit stored in the buffer and a next bit of the first bitstream, and outputting a result of the XOR operation.

22. The method as claimed in claim 20, wherein the generating step comprises multiplying the second UWB wavelet series by the delayed UWB wavelet series;

integrating a product of the second UWB wavelet series and the delayed UWB wavelet series for a time period corresponding to a UWB inter-pulse space to generate an integrated result; and

generating bits of the data stream based on the integrated result, wherein a bit of 0 is generated when the integrated result is larger than 0 and a bit of 1 is generated when the integrated result is smaller than 0.

23. The method as claimed in claim 22, wherein the delaying step comprises passing the first UWB wavelet series through a transmission line having an electrical length providing a time delay corresponding to the UWB inter-pulse space.

24. The method as claimed in claim 20, wherein the second UWB wavelet series received in the receiving step is a multiple band UWB wavelet series whose frequency band changes by pulse.