CA2483593A1 - Multipath logic for error correction in the demodulation of encoded signals in transmission links - Google Patents
Multipath logic for error correction in the demodulation of encoded signals in transmission links Download PDFInfo
- Publication number
- CA2483593A1 CA2483593A1 CA 2483593 CA2483593A CA2483593A1 CA 2483593 A1 CA2483593 A1 CA 2483593A1 CA 2483593 CA2483593 CA 2483593 CA 2483593 A CA2483593 A CA 2483593A CA 2483593 A1 CA2483593 A1 CA 2483593A1
- Authority
- CA
- Canada
- Prior art keywords
- combination
- error correction
- transmission links
- demodulation
- type
- 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.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/233—Demodulator circuits; Receiver circuits using non-coherent demodulation
- H04L27/2331—Demodulator circuits; Receiver circuits using non-coherent demodulation wherein the received signal is demodulated using one or more delayed versions of itself
Abstract
The invention provides a novel way of using channel logic gates in encoded transmission links, for example differential phase for telecommunication. The invention includes a plurality of different data path which can be separated by power dividers to perform logical functions on the channels after which they are then individually detected. The logical recombination and logical operations on the received data leads to error correction. The technique is not restricted to optical signals and can be used in other transmission channel like satellite communication, mobile communication as well as computer interconnects.
Description
Description 1. This invention relates to a method of performing error correction in encoded transmission links.
Several methods are commonly used to lower the error rate of a transmission link or increase the bandwidth in the channel while maintaining the error-rate. In an optical fiber channel, new types of optical fibre and amplifiers can increase the transmitted bandwidth over a longer distance but the capital investment required for installation is considerable.
A solution that improves the transmission without incurring a large cost overhead is highly attractive.
A technology commonly used in transmission links is error correction algorithms. For example forward-error-correction (FEC) is an error correction scheme that detects and corrects transmission errors at the receiver end without calling for retransmission. With FEC, bits are added to the message prior to transmission to detect and correct errors at the receiving end. The technology is very low cost and installation cost is insignificant.
The only drawback is that increased bandwidth is necessary for the code bits added which reduces the effective bit-rate of the transmission, and hence lower data capacity.
The Invention is a new method of using channel logic gates in encoded transmission links, for example differential phase for telecommunication along multiple paths which can correct errors without reducing the effective bandwidth of transmission. The installation cost is low and it can significantly lower the bit error rate and the cost per bit. The method has the advantage that it is compatible with existing transmission systems and does not prohibit the use of any other enhancing technology. Error correction schemes like FEC can still be implemented.
When using a flavour of differentially phase-encoded transmission, which at the receiver is usually demodulated in a delay-line interferometer (DLI) with a single bit delay to create an intensity modulated signal. The invention uses a multipath logical demodulation where the signal is split into different paths directed to different DLIs. Each of the DLI has a specific delay so that a given bit in a time slot interferes with a bit in a different time slot; for example it can be with the following bit in the first path, the second following bit in second path, the 4'h bit in the third path, the 8th bit in fourth path, and so on. In this example the DLIs can be viewed as logical XOR gates in which one input is the signal and the other is the signal with a delay. The intensity modulated signal is detected and converted into a logical signal. Then using logic gates, the bit patterns from the different paths are reconverted to the same pattern.
The process relocates the errors in the data pattern and by, for example, comparison of the different paths, error correction can be performed.
In the embodiment shown in figure 1 applied to optical fibre transmission link, the signal is divided in 3 different path which are individually detected by photodetectors.
The following logical operations allow for comparison of the different paths and error-correction.
Several methods are commonly used to lower the error rate of a transmission link or increase the bandwidth in the channel while maintaining the error-rate. In an optical fiber channel, new types of optical fibre and amplifiers can increase the transmitted bandwidth over a longer distance but the capital investment required for installation is considerable.
A solution that improves the transmission without incurring a large cost overhead is highly attractive.
A technology commonly used in transmission links is error correction algorithms. For example forward-error-correction (FEC) is an error correction scheme that detects and corrects transmission errors at the receiver end without calling for retransmission. With FEC, bits are added to the message prior to transmission to detect and correct errors at the receiving end. The technology is very low cost and installation cost is insignificant.
The only drawback is that increased bandwidth is necessary for the code bits added which reduces the effective bit-rate of the transmission, and hence lower data capacity.
The Invention is a new method of using channel logic gates in encoded transmission links, for example differential phase for telecommunication along multiple paths which can correct errors without reducing the effective bandwidth of transmission. The installation cost is low and it can significantly lower the bit error rate and the cost per bit. The method has the advantage that it is compatible with existing transmission systems and does not prohibit the use of any other enhancing technology. Error correction schemes like FEC can still be implemented.
When using a flavour of differentially phase-encoded transmission, which at the receiver is usually demodulated in a delay-line interferometer (DLI) with a single bit delay to create an intensity modulated signal. The invention uses a multipath logical demodulation where the signal is split into different paths directed to different DLIs. Each of the DLI has a specific delay so that a given bit in a time slot interferes with a bit in a different time slot; for example it can be with the following bit in the first path, the second following bit in second path, the 4'h bit in the third path, the 8th bit in fourth path, and so on. In this example the DLIs can be viewed as logical XOR gates in which one input is the signal and the other is the signal with a delay. The intensity modulated signal is detected and converted into a logical signal. Then using logic gates, the bit patterns from the different paths are reconverted to the same pattern.
The process relocates the errors in the data pattern and by, for example, comparison of the different paths, error correction can be performed.
In the embodiment shown in figure 1 applied to optical fibre transmission link, the signal is divided in 3 different path which are individually detected by photodetectors.
The following logical operations allow for comparison of the different paths and error-correction.
Claims (8)
- Claim 1 A device that allows received serial data to be delayed relative to each transmitted bit with a well defined sequence.
- Claim 2 A device composed of logic gates connected together to perform logical operations on data as defined in Claim 1.
- Claim 3 The combination defined in claim 2 to perform the logical operations of error correction.
- Claim 4 The combination defined in claim 3 using any type of differential phase shift encoded transmission links.
- Claim 5 The combination defined in Claim 2 using any type of encoding scheme.
- Claim 6 A combination as defined in Claim 5 that is applied to optical communication link.
- Claim 7 A combination as defined in Claim 5 that is applied to satellite, radio or mobile communications.
- Claim 8 A combination as defined in Claims 6-7 using any type of data transmission format
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2483593 CA2483593A1 (en) | 2004-11-01 | 2004-11-01 | Multipath logic for error correction in the demodulation of encoded signals in transmission links |
| PCT/CA2005/001676 WO2006053421A1 (en) | 2004-11-01 | 2005-11-01 | Multi-path error-correcting demodulating method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2483593 CA2483593A1 (en) | 2004-11-01 | 2004-11-01 | Multipath logic for error correction in the demodulation of encoded signals in transmission links |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2483593A1 true CA2483593A1 (en) | 2006-05-01 |
Family
ID=36283086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2483593 Abandoned CA2483593A1 (en) | 2004-11-01 | 2004-11-01 | Multipath logic for error correction in the demodulation of encoded signals in transmission links |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2483593A1 (en) |
| WO (1) | WO2006053421A1 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3819311B2 (en) * | 2002-03-19 | 2006-09-06 | 株式会社東芝 | Modulation method determination method and modulation method determination device |
-
2004
- 2004-11-01 CA CA 2483593 patent/CA2483593A1/en not_active Abandoned
-
2005
- 2005-11-01 WO PCT/CA2005/001676 patent/WO2006053421A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2006053421A1 (en) | 2006-05-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100498326B1 (en) | Adaptive modulation coding apparatus and method for mobile communication device | |
| EP0566257B1 (en) | Method and apparatus for providing antenna diversity | |
| JP3838237B2 (en) | Wireless communication system, transmitting apparatus and receiving apparatus | |
| US9438371B2 (en) | Linear dispersion polarization-time codes and equalization in polarization multiplexed coherent optical system | |
| US20030198282A1 (en) | Orthogonalized spatial multiplexing for wireless communication | |
| WO2000052831A3 (en) | Forward error correction on multiplexed cdma channels enabling high performance coding | |
| CA2341747A1 (en) | Combined channel coding and space-time block coding in a multi-antenna arrangement | |
| US20100246708A1 (en) | Radio communication apparatus, radio communication method, and radio communication system | |
| KR20060048243A (en) | Communication system, transmitting device, and receiving device | |
| EP1834410A1 (en) | Error detection and correction for infrared pulse position modulation system | |
| US20150063823A1 (en) | Method, Transmitter and Receiver Device for Transmitting a Binary Digital Transmit Signal Over an Optical Transmission Link | |
| EP1262027B1 (en) | Method of differential coding and modulation | |
| US6556617B1 (en) | Spread spectrum diversity transmitter/receiver | |
| JP2006109022A (en) | Radio communication system, transmitter and receiver | |
| CN101073065A (en) | Method and apparatus for enhanced decoding in multi-band ultra-wideband communications | |
| US20060057969A1 (en) | Delay diversity in a wireless communication system | |
| CA2483593A1 (en) | Multipath logic for error correction in the demodulation of encoded signals in transmission links | |
| KR101352446B1 (en) | Wireless communication apparatus, communication method and communication system | |
| US20120039244A1 (en) | METHOD AND DEVICE IN RSs OF JOINTLY PROCESSING AND A METHOD AND DEVICE IN BSs OF CORRESPONDING PROCESSING | |
| US20220247496A1 (en) | Super-symbol signaling in optical communication systems | |
| GB2440979A (en) | Achieving coding gain in soft handover using incremental redundancy and bit mapping techniques | |
| US10491438B2 (en) | Systems and methods for reinforcing signals on coupled channels during idle periods | |
| CN100544335C (en) | Adaptability strengthens the method for the bluetooth transmission speed of a transmitting terminal and a receiving terminal | |
| WO2009113763A1 (en) | Cooperative reception diversity apparatus and method based on signal point rearrangement or superposition modulation in relay system | |
| KR20020015086A (en) | Method for orthogonal transmit diversity using differential code in radio communication |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |