Receiver having for charge-coupled-device based receiver signal processing

• US 5,483,549 A
• Filed: 03/04/1994
• Issued: 01/09/1996
• Est. Priority Date: 03/04/1994
• Status: Expired due to Term

• Current Assignee: Exelis Incorporated (L3Harris Technologies, Inc.)
• Original Assignee: Stanford Telecommunications, Inc. (Nokia Corporation)
• Inventors: Cunningham, Kenneth D., Land, Thomas, Simmons, Matthew S., Tucker, Martin W., Urban, Daniel, Weinberg, Aaron
• Primary Examiner(s): Cain, David C.
• Application Number:
  US08/205,496
• Time in Patent Office: 676 Days
• Field of Search: 375/1, 380/34
• US Class Current: 375/151
• CPC Class Codes: F02B 2075/027 four
• CPC Class Codes: G01S 7/285 Receivers
• CPC Class Codes: H04L 27/20 Modulator circuits; Transmitter circuits

Abstract

This invention relates to a novel receiver architecture, the Charge-Coupled-Device Integrated Receiver (IR), which simplifies electronic circuitry requirements and reduce baseband processing rates through efficient signal processing. The focus of this receiver'"'"'s design is its use of Charge-Coupled-Device (CCD) technology. By using CCD'"'"'s, in conjunction with other key technologies, to implement the signal processing techniques disclosed herein, it is possible to provide a receiver that is suitable for a wide range of applications (e.g., communications, sonar, radar, etc.). Information is presented which outlines the fundamental receiver architecture that is appropriate for a wide range of commercial services (e.g., AMPS, NAMPS, Digital Cellular, GSM, PCS, ISM, CT1, CT2, etc.) Furthermore, tile versatility of this architecture makes it suited for uses ranging from simple AM/FM receivers to complex high-order modulation TDMA/CDMA receivers.

Claims

1. A receiver for receiving and processing communication, sonar, and radar signals, comprising:

means for receiving said signals and producing an analog electrical signal corresponding thereto,

an integrated circuit-chip having;

1) a CCD portion connected to receive said analog electrical signal and efficiently reduces and replace selected RF components, selected from mixers, filters, and correlators, and efficiently process wide bandwidth signals and selected ones of the following functions;

a. demodulate

b. filter,

c. store samples,

d. decimate,

e. despread,

f. frequency translation,

g. tune,

h. amplify/attenuate, and

2) an analog-to-digital (A/D) converter, portion, and

a digital signal processor connected to said A/D converter that integrates all synchronization functions in a single chip with significantly reduced power consumption due to the CCD signal processing.

2. A receiver for receiving and processing communication, sonar, and radar signals, comprising:

means for receiving said signals and producing an analog electrical signal corresponding thereto,

a integrated circuit-chip having;

1) a CCD portion connected to receive said analog electrical signals and efficiently reduces and replace selected RF components selected from mixers, filters, and correlators currently employed in conventional receivers, and efficiently process wide bandwidth signals, and perform at least two of the following functions;

a. demodulate,

b. filter,

c. store samples,

d. decimate,

e. despread,

f. frequency translation,

g. tune,

h. amplify/attenuate, and

2) an analog-to-digital (A/D) converter, and a utilization device connected to said A/D converter.

3. The receiver defined in claim 2 including a digital signal processor that integrates all synchronization functions in a single chip with significantly reduced power consumption due to the CCD signal processing.

9. The receiver defined in claim 3 wherein said utilization device includes a digital signal processor and said CCD portion includes a matched filter portion and means for IF sampling with the matched filter and programming said digital signal processor to provide an output that can be used for detecting signals of both digital and analog modulation types.

10. The receiver defined in claim 9, constructed for use in a search and rescue application, said CCD portion being constructed to act as a spread spectrum receiver for passing digital messages via satellite during a search operation and then be reconfigured to handle line of sight FM voice communications during the rescue phase, and signaling structures through the course of the search and rescue mission constructed to be very diverse so that much of the same circuitry could be used in all instances so as to realize an extremely efficient and capable design.

4. A receiver for receiving and processing communication, sonar, and radar signals, comprising:

means for receiving said signals and producing an analog electrical signal corresponding thereto,

a single integrated circuit-chip having;

1) a CCD portion connected to receive said analog electrical signals and constructed to perform at least two of the following functions;

a. demodulate,

b. filter,

c. store samples,

d. decimate,

e. despread,

f. frequency translation,

g. tune,

h. amplify/attenuate,

2) an analog-to-digital (A/D) converter portion, and a utilization device connected to said A/D converter.

5. The receiver defined in claim 4 wherein said CCD portion includes a CCD matched filter to reduce or eliminate RF/IF circuitry, decimate and provide sample-and-hold, and filtering to said electrical signals.

6. The receiver defined in claim 4 wherein said CCD portion is constructed to perform RF to baseband conversion by sampling at a rate commensurate with the nyquist bandwidth but sub-sampling relative to the RF carrier frequency.

7. The receiver defined in claim 4 wherein said CCD portion is constructed to use a common sample set to achieve signal acquisition and tracking.

8. The receiver defined in claim 4 including a CCD adjustable clock and tap weight update means in conjunction with IF sampling to:

a) achieving PN code alignment,

b) achieving carrier alignment, and

c) achieving symbol synchronization.

11. The receiver defined in claim 4 wherein said CCD portion is adapted for PN tracking by over-sampling relative to the chip rate and updating the tracking loop in fractions of a chip duration.

12. A radio transmitter comprised of a single chip having a CCD portion constructed to filter, modulate, tune, spread, amplify and attenuate a signal and generate a waveform for transmission, and

a power amplifier and antennae for receiving said waveform and transmission.