CA2615665A1 - Synchronous spread-spectrum communications system and method - Google Patents
Synchronous spread-spectrum communications system and method Download PDFInfo
- Publication number
- CA2615665A1 CA2615665A1 CA002615665A CA2615665A CA2615665A1 CA 2615665 A1 CA2615665 A1 CA 2615665A1 CA 002615665 A CA002615665 A CA 002615665A CA 2615665 A CA2615665 A CA 2615665A CA 2615665 A1 CA2615665 A1 CA 2615665A1
- Authority
- CA
- Canada
- Prior art keywords
- signal
- chip
- generic
- message
- receiver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
Abstract
A spread spectrum communications system for use over a communications channel, including a transmitter-generic-chip-code generator, a transmitter-message-chip-code generator, an EXCLUSIVE-OR gate, a combiner, a transmitter, a receiver-generic-chip-code generator, a receiver--generic mixer, a generic-bandpass filter, a receiver-message-chip-code generator, a receiver-message mixer, a message-bandpass filter, and a synchronous detector. The transmitter-generic-chip-code generator generates a generic-chip-code signal and the transmitter-message-chip-code generator generates a message-chip-code signal. The EXCLUSIVE-OR gate spread-spectrum processes message data with the message-chip-code signal to generate a spread-spectrum signal. The combiner combines the generic--chip-code signal with the spread-spectrum-processed signal. The transmitter transmits the combined generic-chip-code signal and spread-spectrum signal, on a carrier signal over the communications channel as a spread-spectrum--communications signal. The receiver-generic-chip-code generator generates a replica of the generic-chip-code signal. The generic mixer recovers the carrier signal from the spread-spectrum-communications signal. The receiver-message-chip-code generator generates a replica of the message--chip-code signal. The receiver-message mixer despreads the spread--spectrum-communications signal as a modulated-data signal. The tracking and acquisition circuit uses the recovered carrier signal for synchronizing the replicas of the generic-chip-code signal to the recovered carrier signal. The synchronous detector synchronously demodulates the modulated-data signal as received data.
Claims (8)
1. A method for receiving message data from a code division multiple access transmitter, the method comprising:
receiving a spread spectrum signal;
detecting a first signal within the spread spectrum signal, the first signal having each bit of a bit sequence combined with a plurality of chips;
recovering message data from a second signal within the spread spectrum signal, the second signal having each bit of the message data combined with a plurality of chips; wherein the recovering of the message data is synchronized to the detected first signal.
receiving a spread spectrum signal;
detecting a first signal within the spread spectrum signal, the first signal having each bit of a bit sequence combined with a plurality of chips;
recovering message data from a second signal within the spread spectrum signal, the second signal having each bit of the message data combined with a plurality of chips; wherein the recovering of the message data is synchronized to the detected first signal.
2. The method of claim 1 wherein the first bit sequence is a code word.
3. The method of claim 1 comprising recovering second message data from a third signal within the spread spectrum signal, the third signal having each bit of the second message data combined with a plurality of chips, wherein the recovering of the second message data is synchronized to the detected first signal.
4. The method of claim 1 wherein the plurality of chips of the first signal are different than the plurality of chips of the second signal.
5. A receiver for receiving message data in a code division multiple access format, the receiver comprising:
an input that receives a spread spectrum signal;
a detector that detects a first signal within the spread spectrum signal, the first signal having each bit of a bit sequence combined with a plurality of chips;
a mixing device that recovers message data from a second signal within the spread spectrum signal, the second signal having each bit of the message data combined with a plurality of chips; wherein the recovering of the message data is synchronized to the detected first signal.
an input that receives a spread spectrum signal;
a detector that detects a first signal within the spread spectrum signal, the first signal having each bit of a bit sequence combined with a plurality of chips;
a mixing device that recovers message data from a second signal within the spread spectrum signal, the second signal having each bit of the message data combined with a plurality of chips; wherein the recovering of the message data is synchronized to the detected first signal.
6. The receiver of claim 5 wherein the first bit sequence is a code word.
7. The receiver of claim 5 comprising a second mixing device that recovers second message data from a third signal within the spread spectrum signal, the third signal having each bit of the message data combined with a plurality of chips; wherein the recovering of the second message data is synchronized to the detected first signal.
8. The receiver of claim 5 wherein the plurality of chips of the first signal are different than the plurality of chips of the second signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2679170A CA2679170C (en) | 1990-12-14 | 1991-12-10 | Synchronous spread-spectrum communications system and method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/626,109 US5228056A (en) | 1990-12-14 | 1990-12-14 | Synchronous spread-spectrum communications system and method |
| US07/626,109 | 1990-12-14 | ||
| CA002583679A CA2583679C (en) | 1990-12-14 | 1991-12-10 | Synchronous spread-spectrum communications system and method |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002583679A Division CA2583679C (en) | 1990-12-14 | 1991-12-10 | Synchronous spread-spectrum communications system and method |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2679170A Division CA2679170C (en) | 1990-12-14 | 1991-12-10 | Synchronous spread-spectrum communications system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2615665A1 true CA2615665A1 (en) | 1992-06-15 |
| CA2615665C CA2615665C (en) | 2010-02-02 |
Family
ID=39182098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002615665A Expired - Lifetime CA2615665C (en) | 1990-12-14 | 1991-12-10 | Synchronous spread-spectrum communications system and method |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2615665C (en) |
-
1991
- 1991-12-10 CA CA002615665A patent/CA2615665C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2615665C (en) | 2010-02-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |