CA2494774A1 - Method and apparatus for orthogonal code hopping multiplexing communications - Google Patents
Method and apparatus for orthogonal code hopping multiplexing communications Download PDFInfo
- Publication number
- CA2494774A1 CA2494774A1 CA002494774A CA2494774A CA2494774A1 CA 2494774 A1 CA2494774 A1 CA 2494774A1 CA 002494774 A CA002494774 A CA 002494774A CA 2494774 A CA2494774 A CA 2494774A CA 2494774 A1 CA2494774 A1 CA 2494774A1
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- Canada
- Prior art keywords
- orthogonal
- orthogonal code
- hopping pattern
- code
- codeword group
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- 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.)
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Links
- 238000000034 method Methods 0.000 title claims abstract 12
- 230000005540 biological transmission Effects 0.000 claims abstract 6
- 108091006146 Channels Proteins 0.000 claims 7
- 238000001228 spectrum Methods 0.000 claims 3
- 108010003272 Hyaluronate lyase Proteins 0.000 claims 2
- 238000012544 monitoring process Methods 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0074—Code shifting or hopping
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J13/00—Code division multiplex systems
- H04J13/0007—Code type
- H04J13/004—Orthogonal
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
This invention is concerned with a method and apparatus for statistically multiplexing based on orthogonal code hopping multiplexing according to orthogonal code hopping patterns in wired/wireless communication systems in which a plurality of synchronized communication channels coexist through one media.
The system comparing a primary communication station and a plurality of second communications includes an orthogonal code hopping pattern generator, a spreader for selecting a corresponding orthogonal codeword in the orthogonal code and data symbol , a comparator & controller for monitoring whether the orthogonal codewords collide and determining whether all the transmitting data symbols to the secondary communication stations are the same in the collision interval, a transmission controller for perforation (transmission 'OFF') in case that all the corresponding data symbols with the same orthogonal codeword for spreading are not the same, and a transmission power controller for compensating for the loss of average reception energy due to perforation.
The system comparing a primary communication station and a plurality of second communications includes an orthogonal code hopping pattern generator, a spreader for selecting a corresponding orthogonal codeword in the orthogonal code and data symbol , a comparator & controller for monitoring whether the orthogonal codewords collide and determining whether all the transmitting data symbols to the secondary communication stations are the same in the collision interval, a transmission controller for perforation (transmission 'OFF') in case that all the corresponding data symbols with the same orthogonal codeword for spreading are not the same, and a transmission power controller for compensating for the loss of average reception energy due to perforation.
Claims (12)
1. A transmitter in a spread spectrum communication system including a primary communication station and a secondary communication station, the transmitter comprising:
a channel encoder;
an orthogonal code hopping pattern generator for generating an orthogonal code hopping pattern;
an orthogonal code generator for generating an orthogonal codeword according to the hopping pattern; and an orthogonal code collision detector for detecting collisions of the hopping pattern.
a channel encoder;
an orthogonal code hopping pattern generator for generating an orthogonal code hopping pattern;
an orthogonal code generator for generating an orthogonal codeword according to the hopping pattern; and an orthogonal code collision detector for detecting collisions of the hopping pattern.
2. The transmitter as claimed in claim 1, further comprising a transmission controller for transmitting or perforating encoded data symbols according to an output of the orthogonal code collision detector.
3. The transmitter as claimed in claim 2, wherein the orthogonal code collision detector includes a data symbol comparator for checking whether all of the data symbols of corresponding channels with the same orthogonal codeword for spreading are the same at the time of a hopping pattern collision; and wherein the transmission controller does not transmit the encoded data symbols when the corresponding encoded data symbols are not the same as a result of the data symbol comparator.
4. A receiver in a spread spectrum communications system including a primary communication station and a secondary communication station, the receiver comprising:
a channel decoder;
an orthogonal code hopping pattern generator for generating an orthogonal code hopping pattern; and an orthogonal code generator for generating orthogonal codewords according to the hopping pattern.
a channel decoder;
an orthogonal code hopping pattern generator for generating an orthogonal code hopping pattern; and an orthogonal code generator for generating orthogonal codewords according to the hopping pattern.
5. A method for spread spectrum communications using orthogonal codes, the method comprising the step of:
dividing the orthogonal codes into a first orthogonal codeword group for orthogonal code division multiplexing and a second orthogonal codeword group for statistical multiplexing owing to orthogonal code hopping.
dividing the orthogonal codes into a first orthogonal codeword group for orthogonal code division multiplexing and a second orthogonal codeword group for statistical multiplexing owing to orthogonal code hopping.
6. The method as claimed in claim 5, further comprising the step of:
performing the orthogonal code division multiplexing by fixedly allocating the orthogonal codewords in the first orthogonal codeword group to channels having a high data activity.
performing the orthogonal code division multiplexing by fixedly allocating the orthogonal codewords in the first orthogonal codeword group to channels having a high data activity.
7. The method as claimed in claim 5, further comprising the step of:
performing orthogonal code hopping multiplexing for channels having low channel activity according to the orthogonal code hopping pattern by using only the orthogonal codewords in the second orthogonal codeword group.
performing orthogonal code hopping multiplexing for channels having low channel activity according to the orthogonal code hopping pattern by using only the orthogonal codewords in the second orthogonal codeword group.
8. The method as claimed in claim 5, wherein the orthogonal codes are orthogonal variable spreading factor codes.
9. The method as claimed in claim 8, wherein the first orthogonal codeword group consists of child codes generated from one parent code in a hierarchical orthogonal code generating a tree structure according to the variable spreading factors; and wherein the second orthogonal codeword group consists of remaining orthogonal codewords.
10. The method as claimed in any one of claims 5 to 9, wherein the first orthogonal codeword group used for the code division multiplexing is selected to have a variable spreading gain according to a transmission data rate.
11. The method as claimed in claim 7, wherein the channels for the orthogonal code hopping multiplexing have a fixed data rate.
12. The method as claimed in claims 5 to 11, the method further comprising the step of selecting orthogonal codewords having the same spreading factor in the second orthogonal codeword group.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR19990032187A KR100755038B1 (en) | 1999-08-05 | 1999-08-05 | Orthogonal Code Hopping Multiplexing Communications |
| KR1999/32187 | 1999-08-05 | ||
| CA 2381304 CA2381304C (en) | 1999-08-05 | 2000-08-03 | Method and apparatus for orthogonal code hopping multiplexing communications |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2381304 Division CA2381304C (en) | 1999-08-05 | 2000-08-03 | Method and apparatus for orthogonal code hopping multiplexing communications |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2494774A1 true CA2494774A1 (en) | 2001-02-15 |
| CA2494774C CA2494774C (en) | 2010-07-27 |
Family
ID=34423919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2494774A Expired - Lifetime CA2494774C (en) | 1999-08-05 | 2000-08-03 | Method and apparatus for orthogonal code hopping multiplexing communications |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2494774C (en) |
-
2000
- 2000-08-03 CA CA2494774A patent/CA2494774C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2494774C (en) | 2010-07-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20200803 |