SE9602074D0 - Method for determining the bit-loading in a multicarrier system - Google Patents
Method for determining the bit-loading in a multicarrier systemInfo
- Publication number
- SE9602074D0 SE9602074D0 SE9602074A SE9602074A SE9602074D0 SE 9602074 D0 SE9602074 D0 SE 9602074D0 SE 9602074 A SE9602074 A SE 9602074A SE 9602074 A SE9602074 A SE 9602074A SE 9602074 D0 SE9602074 D0 SE 9602074D0
- Authority
- SE
- Sweden
- Prior art keywords
- parameter
- carrier wave
- detection unit
- symbol detection
- constellation
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/26524—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/26524—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation
- H04L27/26526—Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation with inverse FFT [IFFT] or inverse DFT [IDFT] demodulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] receiver or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/26532—Demodulators using other transforms, e.g. discrete cosine transforms, Orthogonal Time Frequency and Space [OTFS] or hermetic transforms
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2697—Multicarrier modulation systems in combination with other modulation techniques
- H04L27/2698—Multicarrier modulation systems in combination with other modulation techniques double density OFDM/OQAM system, e.g. OFDM/OQAM-IOTA system
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Discrete Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Quality & Reliability (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
The system includes a digital receiver unit and transmission unit. The receiver unit including a symbol detection unit. The system determines a parameter for each individual carrier wave. The parameter indicate a deviation in a received signal from a corresponding constellation point. The parameter is compared with an upper and a lower limit. When the parameter is outside the limits the used constellation is altered in order to modulate the carrier wave to a neighbouring constellation. The symbol detection unit is used to determine the parameter for a carrier wave. The parameter is a ratio d2/o2, where d is the shortest distance between adjoining constellations, o is a standard deviation, and o2 is the variance in the deviations in the input and output signal values in the symbol detection unit.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9602074A SE9602074D0 (en) | 1996-05-24 | 1996-05-24 | Method for determining the bit-loading in a multicarrier system |
SE9603196A SE506643C2 (en) | 1996-05-24 | 1996-09-02 | Multi-carrier wave transmission system e.g. for VDSL system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9602074A SE9602074D0 (en) | 1996-05-24 | 1996-05-24 | Method for determining the bit-loading in a multicarrier system |
SE9603196A SE506643C2 (en) | 1996-05-24 | 1996-09-02 | Multi-carrier wave transmission system e.g. for VDSL system |
Publications (1)
Publication Number | Publication Date |
---|---|
SE9602074D0 true SE9602074D0 (en) | 1996-05-24 |
Family
ID=26662640
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9602074A SE9602074D0 (en) | 1996-05-24 | 1996-05-24 | Method for determining the bit-loading in a multicarrier system |
SE9603196A SE506643C2 (en) | 1996-05-24 | 1996-09-02 | Multi-carrier wave transmission system e.g. for VDSL system |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9603196A SE506643C2 (en) | 1996-05-24 | 1996-09-02 | Multi-carrier wave transmission system e.g. for VDSL system |
Country Status (1)
Country | Link |
---|---|
SE (2) | SE9602074D0 (en) |
-
1996
- 1996-05-24 SE SE9602074A patent/SE9602074D0/en unknown
- 1996-09-02 SE SE9603196A patent/SE506643C2/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
SE9603196D0 (en) | 1996-09-02 |
SE506643C2 (en) | 1998-01-26 |
SE9603196L (en) | 1997-11-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
NO990776L (en) | Multi-carrier transmission system using orthogonal carriers, and a method for determining a constellation for each carrier | |
US4577333A (en) | Composite shift keying communication system | |
US4988972A (en) | Method for transmitting and receiving signals over transmission power lines | |
US4525846A (en) | Modem in-band secondary channel via radial modulation | |
EP0851638A3 (en) | Communication method and receiving apparatus for OFDM system | |
AU5820700A (en) | Synchronization and detection of modulation type | |
EP0851641A3 (en) | Communication method and receiving apparatus for OFDM systems | |
NO323482B1 (en) | Method for Power Management of a Reverse Connection with Highly Variable Data Speed in a Wireless Communication System | |
DE69738337D1 (en) | Method and apparatus for providing high speed data transmission in a cellular environment | |
KR880012036A (en) | Transceiver for frequency division multiplexing optical wave communication system and signal transmission method thereof | |
CN1016395B (en) | Active signalling transmitter control | |
MY132087A (en) | Method and apparatus for aligning a digital receiver | |
DE69030910D1 (en) | MESSAGE SYSTEM WITH MIXED MODULATION LEVELS | |
SE9602074D0 (en) | Method for determining the bit-loading in a multicarrier system | |
DK1060602T3 (en) | Method of reducing peak value of single carrier modulated or multi carrier modulated digital transmit signals | |
JPH0823293A (en) | Power wiring communication interface equipment | |
EP1026840B1 (en) | Polarisation modulation for optical transmission | |
AU2002318950A1 (en) | Technique for continuous ofdm demodulation | |
WO1998001957A3 (en) | Transmission system and receiver with improved detection, and improved detection method | |
ATE249121T1 (en) | DIFFERENTIAL DEMODULATION IN TWO DIMENSIONS | |
JPH08204762A (en) | Demodulation circuit for data communication | |
KR960009464A (en) | Encoder output transmission system | |
JPS57185749A (en) | Method and apparatus for self-test of modulation and demodulation device | |
JPS62154834A (en) | Bit synchronization method | |
JPS6460045A (en) | Data transmitting system by duo-binary fm |