Pulse transmission receiver with higher-order time derivative pulse generator

• US 6,606,350 B2
• Filed: 02/25/2002
• Issued: 08/12/2003
• Est. Priority Date: 09/23/1999
• Status: Expired due to Fees

• Current Assignee: Lockheed Martin Energy Research Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Energy Research Corporation (Martin Marietta Corporation)
• Inventors: Smith, Stephen F., Dress, William B. Jr.
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): Bayard, Emmanuel
• Application Number:
  US10/082,568
• Publication Number:
  US 20020097790A1
• Time in Patent Office: 533 Days
• Field of Search: 375/239, 375/244, 375/256, 375/259, 375/342, 375/326, 375/344, 375/354, 375/213, 375/146, 714/704, 714/707, 714/709
• US Class Current: 375/213
• CPC Class Codes: H04B 1/71637 Receiver aspects H04B1/7183 takes precedence
• 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 1/719 Interference-related aspects
• CPC Class Codes: H04L 25/03834 using pulse shaping
• CPC Class Codes: H04L 25/49 using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems spectral shaping H04L25/03828

Abstract

Systems and methods for pulse-transmission low-power communication modes are disclosed. A pulse transmission receiver includes: a front-end amplification/processing circuit; a synchronization circuit coupled to the front-end amplification/processing circuit; a clock coupled to the synchronization circuit; a trigger signal generator coupled to the clock; and at least one higher-order time derivative pulse generator coupled to the trigger signal generator. The systems and methods significantly reduce lower-frequency emissions from pulse transmission spread-spectrum communication modes, which reduces potentially harmful interference to existing radio frequency services and users and also simultaneously permit transmission of multiple data bits by utilizing specific pulse shapes.

Claims

1. A pulse transmission receiver, comprising:

a front-end amplification/processing circuit;

a synchronization circuit coupled to said front-end amplification/processing circuit;

a clock coupled to said synchronization circuit;

a trigger signal generator coupled to said clock; and

at least one higher-order time derivative pulse generator coupled to said trigger signal generator.

2. The pulse transmission receiver of claim 1, further comprising at least one received pulse detection circuit coupled to said at least on higher-order derivative pulse generator.

3. The pulse transmission receiver of claim 2, wherein said at least one received pulse detection circuit includes a synchronous pulse correlator.

4. The pulse transmission receiver of claim 3, wherein said at least one higher-order time derivative pulse generator includes a data demodulator.

5. The pulse transmission receiver of claim 4, wherein said data demodulator provides at least one function selected from the group consisting of amplitude demodulation, frequency demodulation, phase demodulation, digital binary demodulation, phase-shift keying, binary phase-shift keying, quadrature phase-shift keying, offset quadrature phase-shift keying, frequency-shift keying, minimum-shift keying, amplitude shift keying, on-off keying, multi-state data frequency-shift keying, multi-state data phase-shift keying, multistate data quadrature amplitude demodulation, ternary digital demodulation, and n-state digital demodulation.

6. The pulse transmission receiver of claim 1, further comprising a programmable delay circuit connected between said trigger signal generator and said at least one higher-order time derivative pulse generator.

7. The pulse transmission receiver of claim 1, including a multiplexer coupled to said at least one higher-order time derivative pulse generator.

8. The pulse transmission receiver of claim 7, further comprising a data despreader coupled to said multiplexer.

9. The pulse transmission receiver of claim 8, further comprising a connection between said data despreader and said synchronization circuit adapted to provide automatic frequency/synchronization control.

10. The pulse transmission receiver of claim 1, further comprising a matching network connected to said front-end amplification/processing circuit;

.

11. The pulse transmission receiver of claim 10, further comprising an antenna coupled to said matching network.

12. The pulse transmission receiver of claim 1, wherein said at least one higher-order time derivative pulse generator includes a filter.

13. The pulse transmission receiver of claim 12 where said filter includes a higher-order time derivative Gaussian filter.

14. A one-chip integrated circuit including the pulse transmission receiver of claim 1.

15. The pulse transmission receiver of claim 14, wherein said one-chip integrated circuit is implemented in a semiconductor selected tom the group consisting of silicon bipolar, complementary metal-oxide semiconductor, silicon-germanium and gallium arsenide.

16. The pulse transmission receiver of claim 12, wherein said filter includes a higher order time derivative super-Gaussian filter described by exp(−

x²ⁿ/a) where x is time, n is an integer greater than 1 that represents an order and a is a constant.

17. The pulse transmission receiver of claim 12, wherein said higher order time derivative filter includes a higher order time derivative rounded time-limited square pulse liter.

18. The pulse transmission receiver of claim 12, wherein said higher order time derivative filter includes a higher order time derivative discrete filter.

19. The pulse transmission receiver of claim 18, wherein said higher order time derivative discrete filter is selected from the group consisting of Chebyshev polynomials and Krawtchouk polynomials.