EP0486667A1 - Communication signal having a time domain pilot component - Google Patents
Communication signal having a time domain pilot componentInfo
- Publication number
- EP0486667A1 EP0486667A1 EP91911570A EP91911570A EP0486667A1 EP 0486667 A1 EP0486667 A1 EP 0486667A1 EP 91911570 A EP91911570 A EP 91911570A EP 91911570 A EP91911570 A EP 91911570A EP 0486667 A1 EP0486667 A1 EP 0486667A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- information signal
- pilot
- time domain
- sample
- 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.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0226—Channel estimation using sounding signals sounding signals per se
-
- 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
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
-
- 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
- H04L27/2655—Synchronisation arrangements
- H04L27/2657—Carrier synchronisation
-
- 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
- H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
- H04L27/3411—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set
-
- 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
- H04L27/345—Modifications of the signal space to allow the transmission of additional information
- H04L27/3455—Modifications of the signal space to allow the transmission of additional information in order to facilitate carrier recovery at the receiver end, e.g. by transmitting a pilot or by using additional signal points to allow the detection of rotations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
- H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
- H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
- H04B2201/70701—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation featuring pilot assisted reception
-
- 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
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
- H04L27/26134—Pilot insertion in the transmitter chain, e.g. pilot overlapping with data, insertion in time or frequency domain
Definitions
- the conversion step further includes converting groups of bits that comprise the original information signal into corresponding multibit symbols.
- a predetermined plurality of these symbols constitutes a processed information signal sample sequence.
- Fig. 2 comprises a depiction of a 16 QAM symbol constellation
- pilot sequences for the various subchannels might be staggered in time relative to each other, as depicted in Fig. 4c, to allow interpolation over time and frequency of estimated pilot references for use in recovering symbols for all subchannels.
- a plurality of QAM signals be substantially simultaneously provided, in a manner frequency offset from one another, wherein at least one of the QAM signals includes a time domain pilot reference.
- a pilot interpolation filter (614) then processes this recovered pilot sequence to obtain an estimate of the channel gain at the intervening data symbol instants. Compensation of channel phase and amplitude distortion and recovery of the original data symbols are carried out as follows.
- Delay (616) provided in the second processing path (610) serves to time-align the estimated channel gains with the corresponding data symbols.
- the delayed data symbols are multiplied (617) by the complex conjugates (618) of the estimated channel gains. This operation corrects for channel phase but results in the symbol being scaled by the square of the channel amplitude. This is taken into account in the decision block (619) with appropriate input from a threshold adjustment multiplier (621 ) that itself utilizes nominal threshold information and a squared representation of the complex channel gain estimate (622).
Abstract
Méthodologie d'émission et de réception quadruple à 16 points de modulation d'amplitude en quadrature (QAM) dans laquelle une référence pilote de domaine temporel est incorporée utilement. Il peut y avoir une ou plusieurs de ces références pilotes (402) pour chaque paquet d'impulsions de 16 QAM multiples. Selon le mode de réalisation choisi, chaque impulsion de 16 QAM peut comporter une référence pilote de domaine temporel, ou une référence pilote évaluée pour cette impulsion peut être déterminée soit par rapport aux références pilotes comprises dans d'autres impulsions partageant le même paquet, soit par rapport aux références pilotes pour d'autres impulsions de 16 QAM reçues préalablement et correspondant à la même impulsion.Quadruple quadrature amplitude modulation (QAM) transmission and reception methodology with 16 points in which a time domain pilot reference is usefully incorporated. There may be one or more of these pilot references (402) for each pulse packet of 16 multiple QAMs. Depending on the embodiment chosen, each pulse of 16 QAMs may include a time domain pilot reference, or a pilot reference evaluated for this pulse may be determined either with respect to the pilot references included in other pulses sharing the same packet, or compared to the pilot references for other pulses of 16 QAM received beforehand and corresponding to the same pulse.
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US53682590A | 1990-06-12 | 1990-06-12 | |
US536825 | 1990-06-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0486667A1 true EP0486667A1 (en) | 1992-05-27 |
EP0486667A4 EP0486667A4 (en) | 1993-08-11 |
Family
ID=24140086
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19910911570 Withdrawn EP0486667A4 (en) | 1990-06-12 | 1991-05-17 | Communication signal having a time domain pilot component |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0486667A4 (en) |
JP (1) | JPH05501189A (en) |
KR (1) | KR0137129B1 (en) |
CN (1) | CN1059240A (en) |
AU (1) | AU7951491A (en) |
BR (1) | BR9105788A (en) |
CA (1) | CA2064758C (en) |
WO (1) | WO1991020137A1 (en) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5519730A (en) * | 1990-06-12 | 1996-05-21 | Jasper; Steven C. | Communication signal having a time domain pilot component |
USRE42643E1 (en) | 1991-03-27 | 2011-08-23 | Panasonic Corporation | Communication system |
JP2904986B2 (en) * | 1992-01-31 | 1999-06-14 | 日本放送協会 | Orthogonal frequency division multiplex digital signal transmitter and receiver |
US6724976B2 (en) | 1992-03-26 | 2004-04-20 | Matsushita Electric Industrial Co., Ltd. | Communication system |
US5819000A (en) * | 1992-03-26 | 1998-10-06 | Matsushita Electric Industrial Co., Ltd. | Magnetic recording and playback apparatus |
USRE38513E1 (en) | 1992-03-26 | 2004-05-11 | Matsushita Electric Industrial Co., Ltd. | Communication system |
US5802241A (en) | 1992-03-26 | 1998-09-01 | Matsushita Electric Industrial Co., Ltd. | Communication system |
US6728467B2 (en) | 1992-03-26 | 2004-04-27 | Matsushita Electric Industrial Co., Ltd. | Communication system |
GB2271693A (en) * | 1992-10-13 | 1994-04-20 | Motorola Israel Ltd | Communications system having pilot signals transmitted over frequency divided channels |
US5666378A (en) * | 1994-03-18 | 1997-09-09 | Glenayre Electronics, Inc. | High performance modem using pilot symbols for equalization and frame synchronization |
GB9700947D0 (en) * | 1997-01-17 | 1997-03-05 | Digi Media Vision Ltd | Method and apparatus for receiving frequency division multiplex signals |
US6925067B2 (en) * | 1999-04-23 | 2005-08-02 | Qualcomm, Incorporated | Configuration of overhead channels in a mixed bandwidth system |
US6721267B2 (en) * | 2000-08-01 | 2004-04-13 | Motorola, Inc. | Time and bandwidth scalable slot format for mobile data system |
AU2001293079A1 (en) * | 2000-09-25 | 2002-04-08 | Centillium Communications, Inc. | Robust signaling techniques in multicarrier systems |
WO2009018980A2 (en) * | 2007-08-03 | 2009-02-12 | Oliver Bartels | Radio device with new cifdm modulation method |
US9893927B2 (en) * | 2010-04-08 | 2018-02-13 | Cometch EF Data Corp. | Embedded meta-carrier with spread spectrum via overlaid carriers |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0441731A1 (en) * | 1990-02-06 | 1991-08-14 | ETAT FRANCAIS représenté par le Ministre des P.T.T. (Centre National d'Etudes des Télécommunications-CNET) | Method of data broadcasting using time-frequency interleaving and coherent demodulation |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1217233A (en) * | 1982-12-29 | 1987-01-27 | Susumu Sasaki | Qam with dc bias in one channel |
US4881245A (en) * | 1983-07-01 | 1989-11-14 | Harris Corporation | Improved signalling method and apparatus |
-
1991
- 1991-05-17 EP EP19910911570 patent/EP0486667A4/en not_active Withdrawn
- 1991-05-17 CA CA002064758A patent/CA2064758C/en not_active Expired - Lifetime
- 1991-05-17 BR BR919105788A patent/BR9105788A/en not_active IP Right Cessation
- 1991-05-17 WO PCT/US1991/003481 patent/WO1991020137A1/en not_active Application Discontinuation
- 1991-05-17 KR KR1019920700313A patent/KR0137129B1/en not_active IP Right Cessation
- 1991-05-17 JP JP3510235A patent/JPH05501189A/en active Pending
- 1991-05-17 AU AU79514/91A patent/AU7951491A/en not_active Abandoned
- 1991-06-11 CN CN91103937A patent/CN1059240A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0441731A1 (en) * | 1990-02-06 | 1991-08-14 | ETAT FRANCAIS représenté par le Ministre des P.T.T. (Centre National d'Etudes des Télécommunications-CNET) | Method of data broadcasting using time-frequency interleaving and coherent demodulation |
Non-Patent Citations (1)
Title |
---|
See also references of WO9120137A1 * |
Also Published As
Publication number | Publication date |
---|---|
BR9105788A (en) | 1992-08-04 |
KR0137129B1 (en) | 1998-06-01 |
JPH05501189A (en) | 1993-03-04 |
CA2064758C (en) | 1996-11-12 |
EP0486667A4 (en) | 1993-08-11 |
CN1059240A (en) | 1992-03-04 |
AU7951491A (en) | 1992-01-07 |
CA2064758A1 (en) | 1991-12-13 |
KR920702579A (en) | 1992-09-04 |
WO1991020137A1 (en) | 1991-12-26 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 19920309 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB SE |
|
A4 | Supplementary search report drawn up and despatched |
Effective date: 19930623 |
|
AK | Designated contracting states |
Kind code of ref document: A4 Designated state(s): DE FR GB SE |
|
RHK1 | Main classification (correction) |
Ipc: H04L 5/06 |
|
17Q | First examination report despatched |
Effective date: 19960131 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19960611 |