EP3289743A1 - Method and communication system for wireless data transmission via a local radio network - Google Patents
Method and communication system for wireless data transmission via a local radio networkInfo
- Publication number
- EP3289743A1 EP3289743A1 EP16722913.7A EP16722913A EP3289743A1 EP 3289743 A1 EP3289743 A1 EP 3289743A1 EP 16722913 A EP16722913 A EP 16722913A EP 3289743 A1 EP3289743 A1 EP 3289743A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pilot
- subcarrier
- transmission signal
- data
- subcarriers
- 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.)
- Ceased
Links
Classifications
-
- 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
-
- 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
- H04L27/2662—Symbol synchronisation
-
- 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
- H04L27/2668—Details of algorithms
- H04L27/2673—Details of algorithms characterised by synchronisation parameters
- H04L27/2675—Pilot or known symbols
-
- 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
- H04L25/0204—Channel estimation of multiple channels
-
- 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
- H04L27/26025—Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking
-
- 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
Definitions
- the invention relates to a method for wireless
- Frequency division multiplexing method over a local radio network, wherein a part of the subcarriers of the transmission signal are reserved as pilot subcarrier for pilot symbols for channel estimation, and a corresponding communication system.
- Fourth and fifth generation communication systems use what is known as wireless communication
- Orthogonal frequency division multiplexing OFDM
- the information to be transmitted or the data stream to be transmitted is split or parallelized within the radio channel to a plurality of subchannels or subcarriers, the information to be transmitted being transmitted in parallel at a relatively low data rate but in an additive superimposed form become.
- a serial data stream in the transmitter for the modulation of, for example, n subcarriers a serial / parallel conversion is performed, wherein for the time ith OFDM block with the block length T 'and the jth subcarrier each a binary code word is formed. From the formed codewords are with the help of a
- Modulation products will be the corresponding discrete-time
- This transmit signal is in scanned, d. H. discrete Fourier transform - IDFT - calculated directly from the modulation symbols or transmission symbols of the individual considered subcarrier.
- the OFDM method can be used, for example, with the parameters of the IEEE 802.11 standard. a / g / n / ac (WLAN) are used. In this
- a send icon consists of several
- the transmit symbol 80 may comprise time samples of which 16 are available as prefix and 64 as data.
- the time samples of the data field are generated by a fast inverse Fourier transform (IFFT) from the same number of spectral values, with a certain number of these spectral values representing the channel symbols to be transmitted.
- IFFT fast inverse Fourier transform
- the time samples thus obtained are sampled at a rate of e.g. 20 megasamples per second via digital-to-analog converter (DAC) to the radio module of a transmitter handed over.
- the signal bandwidth is limited and in the present case is 20 MHz.
- the sampling rate can be set to 40 MHz / 80 MHz / 160 MHz and therefore the bandwidth
- the problems described here which refer to the 20 MHz WLAN variant, also apply to the 40/80/160 MHz variants.
- the actual usable bandwidth is less than 20 MHz, namely limited to 18 MHz.
- this requirement is met in such a way that the subcarriers or channel symbols lying outside this band are not used, ie the corresponding spectral values are set to zero.
- Channel transmission function at the pilot frequencies are calculated because of the there known in the transmission signal spectral values.
- Data subcarriers can by means of low-pass interpolation
- This training sequence contains all
- Pilot symbols are reserved for channel estimation.
- Pilot subcarrier be used.
- Pilot subcarriers all other subcarriers are used.
- the data rate for the transmission can be increased.
- Pilot subcarrier be used.
- Transmission signal can be provided that the sampling rate for the transmission signal compared to where individual methods
- Pilot subcarrier or data subcarrier are set to zero, is reduced.
- the aforementioned WLAN standard with a sampling rate of 20
- Megasamples per second a sample rate of less than 20 megasamples per second, in particular less than 17 megasamples per second, are used, such as one
- the sampling rate can be increased to 40 MHz / 80 MHz / 160 MHz and thus the bandwidth to 40/80/160 MHz. Accordingly, it can be provided that the
- Channel transfer function does not exceed the sum of the time samples of the pilot subcarriers. For 16 pilot subcarriers, the length of the channel impulse response should therefore be the
- a communication system comprises a transmitter for the wireless transmission of data in real time by means of orthogonal frequency division multiplexing via a local radio network, which can transmit a transmission signal in which a part of the subcarrier of the transmission signal as
- Pilot subcarriers are reserved for pilot symbols for channel estimation and all pilot subcarriers are used.
- Fig. 1 shows an inventive transmission symbol with division into
- FIG. 4 shows a representation of the spectral values (subcarrier) of a transmission signal according to the invention.
- 1 shows a transmission symbol of an OFDM method with the parameters of the IEEE 802.11.a / g / n (WLAN) standard.
- the send icon is eighty
- Time samples 1-16 serve as a prefix (cyclic prefix) PR and 64 time samples 17-80 are available as a data field DF for the data.
- the 64 time samples 17-80 of the data field are out of 64 by a fast inverse Fourier transform (IFFT)
- Spectral values generated, with a certain number of these spectral values represents the channel symbols to be transmitted.
- the time samples thus obtained are transferred at a rate of 20 megasamples per second via digital-to-analog converter (DAC) to the radio module of a transmitter.
- DAC digital-to-analog converter
- Signal bandwidth is limited and in the present example is 20 MHz.
- the actual usable bandwidth is limited to 18 MHz, which is shown in FIG. 2: for a certain frequency fc, the
- Pilotsubicn is known for example from the European patent application no. 13197228.3.
- every fourth spectral value is reserved for a pilot symbol.
- Circles Gl to Gll show the zero set spectral values, with two of these
- the values of the channel transmission function can be calculated in the receiver at the pilot frequencies P1-P14 because of the spectral values known there in the transmission signal.
- the estimation of the intermediate values is done by low-pass interpolation.
- Pilot frequencies P7, P8 set to zero, this corresponds to the multiplication of the channel transfer function with a
- Frequency range corresponds to a convolution in the time domain. Thus comes to the length of the channel impulse response nor the length of the time function corresponding to the mask function: was the original channel transfer function not far
- Subcarrier set to zero. This will also all as
- Pilot subcarrier reserved subcarrier used as a pilot subcarrier is reserved subcarrier used as a pilot subcarrier.
- Pilot subcarriers P15 and P16 left nine more spectral values (subcarrier) G1-G3, G5-G7, G9-G11, which are now also available for data transmission and used, whereby the data rate can be increased.
- these spectral values (subcarriers) are also indicated by a cross as a data symbol.
- the channel estimation based on the method according to the invention is the same as for training sequences
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA50542/2015A AT517364B1 (en) | 2015-06-24 | 2015-06-24 | Method and communication system for wireless data transmission over a local radio network |
PCT/EP2016/061024 WO2016206866A1 (en) | 2015-06-24 | 2016-05-17 | Method and communication system for wireless data transmission via a local radio network |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3289743A1 true EP3289743A1 (en) | 2018-03-07 |
Family
ID=55971023
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16722913.7A Ceased EP3289743A1 (en) | 2015-06-24 | 2016-05-17 | Method and communication system for wireless data transmission via a local radio network |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3289743A1 (en) |
AT (1) | AT517364B1 (en) |
WO (1) | WO2016206866A1 (en) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7453792B2 (en) * | 2002-11-14 | 2008-11-18 | Edgewater Computer Systems, Inc. | Receiver architecture for pilot based OFDM systems |
EP1499059B1 (en) * | 2003-07-18 | 2011-07-06 | Motorola Mobility, Inc. | Method and device for determining the link quality in an OFDM network |
EP1727324A1 (en) * | 2005-05-25 | 2006-11-29 | Siemens Aktiengesellschaft | Radio transmission with guard interval of variable length |
US7907909B2 (en) * | 2008-09-18 | 2011-03-15 | Motorola Mobility, Inc. | Method and system for radio frequency (RF) group delay compensation in a broadcast system |
-
2015
- 2015-06-24 AT ATA50542/2015A patent/AT517364B1/en active
-
2016
- 2016-05-17 EP EP16722913.7A patent/EP3289743A1/en not_active Ceased
- 2016-05-17 WO PCT/EP2016/061024 patent/WO2016206866A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
AT517364A1 (en) | 2017-01-15 |
AT517364B1 (en) | 2020-01-15 |
WO2016206866A1 (en) | 2016-12-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1889431B1 (en) | Radio transmission having variable lengths of guard intervals | |
DE102004052899A1 (en) | Both on sporadic as well as on continuous data communication oriented OFDM transmission method for a WLAN | |
WO2019202002A2 (en) | Packet detector/decoder for a radio transmission system | |
DE10294307B4 (en) | Method for transmitting data by multi-carrier modulation | |
DE19962340B4 (en) | Transmitter for sending signals via radio channels and method for transmitting signals via radio channels | |
EP1413082A1 (en) | Method for data communication between a single-carrier and a multi-carrier system | |
EP3094019B1 (en) | Rf test device and method for testing a d2d-capable mobile radio terminal | |
DE102007036828B4 (en) | Radio with new CIFDM modulation method | |
EP3289743A1 (en) | Method and communication system for wireless data transmission via a local radio network | |
DE602004012384T2 (en) | FSK with offset frequencies | |
WO2019202031A1 (en) | Packet correlator for a radio transmission system | |
EP2095591B1 (en) | OFDM communication system with fast frequency hops | |
DE112020001443T5 (en) | DEVICES, SYSTEMS AND METHODS FOR NARROW BAND COMMUNICATION WITHIN A PROTOCOL WITH FREQUENCY MULTIPLEXING | |
DE102018010285B3 (en) | Packet detector / decoder for a radio transmission system | |
DE102019216789A1 (en) | Radio communication method for transmitting pre-coded stream outputs generated by applying pre-coding to stream inputs with different packet formats, and associated radio communication device | |
DE102015221019A1 (en) | Method and communication system for receiving frequency multiplexed data symbols | |
EP2706363A2 (en) | Line for marking common points in time | |
WO2009018980A2 (en) | Radio device with new cifdm modulation method | |
EP2534805B1 (en) | Method for reducing information losses in an ofdm-based multi-carrier signal | |
EP3481020B1 (en) | Method for synchronising transmission and reception units in multi-carrier signal transmission | |
AT517986B1 (en) | Method and communication system for receiving frequency-multiplexed transmitted frames | |
DE102015224231A1 (en) | Method and communication system for the wireless transmission of data by means of orthogonal frequency division multiplexing | |
WO2004091162A1 (en) | Method and device for reducing the ratios between peak power and average power in a multicarrier system | |
EP1744512A1 (en) | Multicarrier system with transmission of synchronisation signal on multiple subcarriers | |
WO2004071042A1 (en) | Method and device for transmitting data in a multi-carrier system |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
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 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20171128 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17Q | First examination report despatched |
Effective date: 20190809 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R003 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
18R | Application refused |
Effective date: 20200127 |