Spread spectrum communication system using DECT protocol

• US 6,891,816 B2
• Filed: 06/14/2001
• Issued: 05/10/2005
• Est. Priority Date: 03/03/1997
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Smith, Douglas G., Dixon, Robert C.
• Primary Examiner(s): HSU, ALPUS
• Application Number:
  US09/882,270
• Publication Number:
  US 20020034171A1
• Time in Patent Office: 1,426 Days
• Field of Search: 370/277, 370/280, 370/294, 370/329, 370/335, 370/337, 370/342, 370/347, 370/349, 370/465, 370/469, 375/130, 375/140, 375/141, 375/142, 375/146, 375/147, 375/150, 375/346, 375/347, 375/348, 455/38.1, 455/450, 455/451, 455/452, 455/507, 455/509, 455/517
• US Class Current: 370/335
• CPC Class Codes: H04B 1/7093 Matched filter type
• CPC Class Codes: H04B 7/2618 using hybrid code-time division multiple access [CDMA-TDMA]

Abstract

A spread spectrum transmitter adapted for transmitting input data streams from a DECT (Digital European Cordless Telecommunication System) MAC (medium-access control) layer, where the data streams conform to a DECT physical layer packet structure. A related spread spectrum receiver is also disclosed.

Claims

1. A spread spectrum transmitter comprising:

an interface for accepting an input data stream from a DECT (Digital European Cordless Telecommunication System) MAC (medium-access control) layer, the data stream conforming to DECT physical layer packet structure;

a chip sequence transmitter generator for generating a chip sequence;

a first modulator for modulating the input data stream with the chip sequence to produce a spread spectrum signal;

a second modulator for modulating the spread spectrum signal with a carrier generator signal to produce a modulated spread spectrum signal; and

an antenna for transmitting the modulated spread spectrum signal over a channel.

2. The spread spectrum transmitter of claim 1 included in a user station.

3. The spread spectrum transmitter of claim 1 included in a base station.

4. The spread spectrum transmitter of claim 1 wherein the first modulator modulates the input data stream using a spreading code.

5. The spread spectrum transmitter of claim 4 wherein the chip sequence is transmitted for each data bit of the input data stream permitting correlation to occur within each bit transmitted.

6. The spread spectrum transmitter of claim 4 wherein the chip sequence is transmitted for each of a plurality of data bits of the input data stream permitting correlation to occur within a time frame allotted to each plurality of data bits transmitted.

7. The spread spectrum transmitter of claim 1 wherein the chip sequence is based on a pseudo-random spreading code.

8. A spread spectrum receiver comprising:

an antenna for receiving a modulated spread spectrum data stream from a channel; and

a spread spectrum correlator for despreading the received spread spectrum data steam and presenting the despreaded spectrum data stream to a data interface and thereafter to a DECT (Digital European Cordless Telecommunication System) MAC (medium-access control) layer, the data stream conforming to DECT physical layer packet structure.

9. The spread spectrum receiver of claim 8 included in the user station.

10. The spread spectrum receiver of claim 8 included in a base station.

11. The spread spectrum receiver of claim 8 wherein the spread spectrum correlator is an asymmetric spread spectrum correlator.

12. The spread spectrum receiver of claim 11 wherein the asymmetric spread spectrum correlator synchronizes the received spread spectrum data stream within a time frame allotted to each transmitted bit of the input data stream.

13. The spread spectrum receiver of claim 8 wherein the spread spectrum correlator synchronizes the received spread spectrum data stream within a time frame allotted to each of a plurality of transmitted bits of the input data stream.

14. The spread spectrum receiver of claim 13 wherein the plurality of transmitted bits counts six.

15. The spread spectrum receiver of claim 8 wherein the spread spectrum correlator rapidly synchronizes the received spread spectrum data stream without generating a local reference code.

16. A spread spectrum transmitter comprising:

a means for accepting an input data stream from a DECT (Digital European Cordless Telecommunication System) MAC (media-access control) layer, the data stream conforming to DECT physical layer packet structure;

a means for generating a chip sequence;

a first modulating means for modulating the input data stream with the chip sequence to produce a spread spectrum signal;

a second modulating means for modulating the spread spectrum signal with a carrier generator signal to produce a modulated spread spectrum signal; and

a means for transmitting the modulated spread spectrum signal over a channel.

17. The spread spectrum transmitter of claim 16 wherein the first modulating means modulates the input data stream using a spreading code.

18. The spread spectrum transmitter of claim 17 wherein the chip sequence is transmitted for each data bit of the input data stream permitting correlation to occur within a time frame allotted to each bit transmitted.

19. The spread spectrum transmitter of claim 17 wherein the chip sequence is transmitted for a plurality of data bits of the input data stream permitting correlation to occur within a time frame allotted to each of the plurality of data bits transmitted.

20. The spread spectrum transmitter of claim 17 wherein the chip sequence is based on a pseudo-random spreading code.

21. The spread spectrum transmitter of claim 17 wherein the transmitter is included in one of the group comprising a user station and a base station.