WO1999066686A1 - Method and device for wireless data transmission according to an fsk method, especially a gfsk method - Google Patents
Method and device for wireless data transmission according to an fsk method, especially a gfsk method Download PDFInfo
- Publication number
- WO1999066686A1 WO1999066686A1 PCT/DE1999/001721 DE9901721W WO9966686A1 WO 1999066686 A1 WO1999066686 A1 WO 1999066686A1 DE 9901721 W DE9901721 W DE 9901721W WO 9966686 A1 WO9966686 A1 WO 9966686A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transmission
- error rate
- field strength
- frequency
- data
- Prior art date
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
- H04L27/20—Modulator circuits; Transmitter circuits
- H04L27/2003—Modulator circuits; Transmitter circuits for continuous phase modulation
- H04L27/2007—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained
- H04L27/2017—Modulator circuits; Transmitter circuits for continuous phase modulation in which the phase change within each symbol period is constrained in which the phase changes are non-linear, e.g. generalized and Gaussian minimum shift keying, tamed frequency modulation
-
- 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
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0016—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy involving special memory structures, e.g. look-up tables
-
- 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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
- H04L25/03834—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using pulse shaping
Definitions
- the present invention relates to a device and a method for the wireless transmission of data according to an FSK method, such as the GFSK method, as is used, inter alia, according to the DECT standard.
- FSK method such as the GFSK method
- DECT Data is modulated according to a GFSK (Gaussian Frequency Shift Keying) method.
- GFSK Gausian Frequency Shift Keying
- the channel spacing is 1728 kHz.
- the TDMA access method with frames of 10 ms is used.
- the duplex method is the TDD method.
- the impulse response h (t) of a Gaussian low pass is:
- the Gaussian low-pass filter can be switched directly before the modulation input of a VCO. Then there are pulses at the modulation input, which result from the folding of the original rectangular pulses with the impulse response of the Gaussian low pass:
- the GFSK transmission filter can be uniquely identified by its Modula ⁇ tion index ( "BT ratio") mark.
- FIG. 6 shows the impulse response of the transmission filter for different modulation indices (BT). It can be seen here that as the modulation indices become smaller, the impulse response becomes wider and thus a "partial response" behavior occurs.
- Modulationsver ⁇ was driving GFSK with a nominal modulation index (BT) specified by 0.5, which ent a frequency deviation of 288 kHz ⁇ talks.
- BT nominal modulation index
- a range of 202 kHz to 403 kHz to ⁇ is bezüg ⁇ Lich permeable.
- the frequency swing is set to a fixed value, so adaptation is not possible.
- the frequency deviation of an FSK method for example the GFSK method, is changed depending on various parameters.
- a method for wireless transmission of data according to an FSK method is therefore provided.
- data is received and the error rate (BER, Bit He ⁇ ror rate) measured the received data.
- the field strength (RSSI value) of the received data is measured.
- the error rate and the field strength are evaluated.
- the frequency swing of the FSK method is used, which is used for the wireless transmission of the data in order to optimize the transmission behavior.
- the frequency swing can be changed within a preset range.
- the optimization of the Ubertragungs s can be done using a table that reflects the achievable range of Studentstra ⁇ supply depending on the set frequency deviation.
- the fre- quenzhub can be optimized for maximum range using the table mentioned.
- the transmission behavior can be optimized on the basis of a second table, which shows the achievable immunity to interference from the transmission depending on the frequency swing set.
- the frequency swing can be optimized for maximum immunity to interference using the second table mentioned.
- the transmission can take place according to the DECT standard.
- the optimum frequency swing can be chosen smaller for a maximum range than the frequency swing for maximum interference immunity.
- a device for wireless transmission of data according to an FSK method such as is used according to the DECT standard.
- the device has a receiver and a first measuring device for the error rate (BER, bit error rate) of the received data.
- BER bit error rate
- a second measuring device for the field strength during the reception of the data is provided.
- An evaluation unit processes the measured error rate and the measured field strength.
- a control unit is also provided to control the frequency swing of the FSK process, which is used for the wireless transmission of the data by a
- Transmitter is used, depending on the measured error rate and the measured field strength to optimize the transmission behavior.
- FIG. 1 shows the structure of a device according to the invention for the wireless transmission of data in accordance with an FSK method
- FIGS. 5a to 5d the various spectra of GFSK signals for the measurement of changes shown in FIGS. 2 to 4 were ⁇ applies, and
- Fig. 6 shows the impulse response g (t) of a GFSK filter.
- the present invention is generally at FSK method application and is described, for example, using a GFSK procedural ⁇ proceedings.
- the phenomenon is excluded use is that depending on the set modulation index (BT) value FSK method, for example the GFSK method a different system behavior of drahtlo ⁇ sen transmission, for example with respect to the Grenzempfind ⁇ friendliness (range) or immunity. If the greatest possible range is sought for the transmission, the frequency deviation to be selected for this differs from the frequency deviation from one to the maximum Immunity optimized system. Therefore, according to the present invention, after evaluating the bit error rate (BER, bit error rate) and the corresponding RSSI (radio signal strength indicator, reception field strength) value, the system is adapted to different ones by appropriately setting the frequency swing (corresponding to a modulation index) Scenarios.
- BER bit error rate
- RSSI radio signal strength indicator, reception field strength
- digitally modulated signals can be received by an antenna 1 and sent to a receiver (receiver) 3.
- the receiver 3 transmits the received data (RX data) 7 and on the other hand the RSSI value 8 to an evaluation unit 6. More precisely, the receiver 3 transmits the received data 7 and the RSSI value 8 to a control unit 13 in the evaluation unit 6 .
- the evaluation unit 6 has a first table 12 and a second table 14, which are each connected to the control unit 13.
- the control inputs 13 integrated in the evaluation unit 6 controls the one hand, a local oscillator (synthesizer) 4 at which the Mobilfunkge ⁇ Raets 16 is connected to the receiver (receiver) 3, and a transmitter (transmitter). 5
- the control unit 13 of the evaluation unit 6 controls the frequency deviation used by the transmitter 5.
- the evaluation unit 6 also transmits data 11 to be transmitted to the transmitter 5, which transmits this data (TX data) 11 with that specified by the control unit 13 10 duliert frequency deviation of the frequency of the local oscillator (synthesizer) 4 mo ⁇ and then passes to an antenna 2 for transmission over a wireless transmission 15th
- the control unit 13 in the evaluation unit 6 thus receives the received data 7 and the RSSI value 8 from the receiver 3.
- the bit error rate of the received data 7 and the received field strength (RSSI value) measured by the receiver 3 are evaluated in the control unit 13, so that the following scenarios can be distinguished: Case a)
- the received data 7 have small bit error rates with a strong reception field at the same time.
- control unit 13 can control the frequency swing of the transmitter 5 for maximum range.
- the first table 12 and the second table 14 m of the evaluation unit 6 are provided.
- the maximum achievable range of the wireless transmission 15 is specified as a function of the frequency swing that can be selected within a permitted range.
- the second table 14 shows the maximum immunity to interference as a function of the frequency swing.
- Tables 12 and 14 are created, for example, before the actual transmission by analyzing the system behavior of the wireless transmission 15 by simulations with different frequency hubs. 2, the bit error rate was calculated as a function of the signal-to-noise ratio.
- the curves shown in FIG. 2 represent the following key data:
- Frequency sweep of 340 kHz frequency sweep, as is fixed in some devices according to the prior art,
- 5a to 5d show the test signals used in the simulations.
- the system can be adapted to different scenarios by evaluating the bit error rate and the corresponding RSSI value by appropriately setting the frequency swing of an FSK transmission.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Quality & Reliability (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Power Engineering (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000555402A JP2002518939A (en) | 1998-06-17 | 1999-06-11 | Wireless data transmission method and apparatus using FSK method, especially GFSK method |
EP99938181A EP1088432A1 (en) | 1998-06-17 | 1999-06-11 | Method and device for wireless data transmission according to an fsk method, especially a gfsk method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19827028.3 | 1998-06-17 | ||
DE1998127028 DE19827028C2 (en) | 1998-06-17 | 1998-06-17 | Method and device for the wireless transmission of data according to an FSK method, in particular a GFSK method |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999066686A1 true WO1999066686A1 (en) | 1999-12-23 |
Family
ID=7871191
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1999/001721 WO1999066686A1 (en) | 1998-06-17 | 1999-06-11 | Method and device for wireless data transmission according to an fsk method, especially a gfsk method |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1088432A1 (en) |
JP (1) | JP2002518939A (en) |
CN (1) | CN1315101A (en) |
DE (1) | DE19827028C2 (en) |
WO (1) | WO1999066686A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19957093A1 (en) | 1999-11-26 | 2001-05-31 | Rohde & Schwarz | Digital test signal generation system combines external and stored modulation signals allows real time test of many channels |
DE10005324A1 (en) * | 2000-02-07 | 2001-08-09 | Siemens Ag | Transmit signal optimisation scheme for CDMA cellular networks uses impulse response knowledge simplifies reception |
US20070080779A1 (en) * | 2005-10-12 | 2007-04-12 | Lear Corporation | System and method for remotely controlling a function |
JP5608140B2 (en) * | 2011-03-15 | 2014-10-15 | オムロンオートモーティブエレクトロニクス株式会社 | Transmitting apparatus and transmitting method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992022162A1 (en) * | 1991-06-03 | 1992-12-10 | British Telecommunications Public Limited Company | Qam system in which the constellation is modified in accordance with channel quality |
GB2303769A (en) * | 1995-07-26 | 1997-02-26 | Nec Corp | Communication Equipment with Transmission Rate Regulating Function |
US5712877A (en) * | 1995-05-26 | 1998-01-27 | Simon Fraser University | Pilot-symbol aided continuous phase modulation system |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL189588C (en) * | 1981-04-01 | 1993-05-17 | Philips Nv | TRANSMITTER FOR CORNER MODULATED SIGNALS. |
DE3730399A1 (en) * | 1987-09-10 | 1989-03-23 | Armin Wittneben | Method and device for transmitting a digital signal |
DE19620843B4 (en) * | 1996-05-23 | 2005-08-11 | Siemens Ag | Modulation carrier modulation method and mobile communication system |
-
1998
- 1998-06-17 DE DE1998127028 patent/DE19827028C2/en not_active Expired - Fee Related
-
1999
- 1999-06-11 CN CN 99807496 patent/CN1315101A/en active Pending
- 1999-06-11 EP EP99938181A patent/EP1088432A1/en not_active Withdrawn
- 1999-06-11 JP JP2000555402A patent/JP2002518939A/en active Pending
- 1999-06-11 WO PCT/DE1999/001721 patent/WO1999066686A1/en not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992022162A1 (en) * | 1991-06-03 | 1992-12-10 | British Telecommunications Public Limited Company | Qam system in which the constellation is modified in accordance with channel quality |
US5712877A (en) * | 1995-05-26 | 1998-01-27 | Simon Fraser University | Pilot-symbol aided continuous phase modulation system |
GB2303769A (en) * | 1995-07-26 | 1997-02-26 | Nec Corp | Communication Equipment with Transmission Rate Regulating Function |
Also Published As
Publication number | Publication date |
---|---|
DE19827028A1 (en) | 1999-12-30 |
CN1315101A (en) | 2001-09-26 |
JP2002518939A (en) | 2002-06-25 |
DE19827028C2 (en) | 2003-06-18 |
EP1088432A1 (en) | 2001-04-04 |
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