WO2011115545A1 - Method and device for transmission of signals in a gsm system - Google Patents
Method and device for transmission of signals in a gsm system Download PDFInfo
- Publication number
- WO2011115545A1 WO2011115545A1 PCT/SE2011/050240 SE2011050240W WO2011115545A1 WO 2011115545 A1 WO2011115545 A1 WO 2011115545A1 SE 2011050240 W SE2011050240 W SE 2011050240W WO 2011115545 A1 WO2011115545 A1 WO 2011115545A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- burst
- egprs
- egprs2
- long
- symbols
- Prior art date
Links
Classifications
-
- 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
-
- 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
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
-
- 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
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
Definitions
- the present invention relates to a method and a device for transmitting signals in a GSM system.
- GSM Global System for Mobile Communication
- EDGE Enhanced Data rates for GSM Evolution
- bit sequence (p n ) has the following structure.
- PSK Phase Shift Keying
- QAM Quadrature Amplitude Modulation
- ⁇ is the total number of guard symbols
- v is the total number of tail symbols
- D is the total number of payload symbols
- N tr is the number of training symbols.
- a vector z of length N is constructed from the payload x and training symbols s accordingly.
- Discrete Fourier Transform (DFT) -precoding is applied to z to form a new sequence of complex numbers Z as follows. Let Wbe the Fourier transform matrix of size Nx N whose entry in the m-t row and - th column is
- N Z W H ⁇ z .
- Multiplication by the matrix W H can be implemented efficiently using the fast Fourier transform.
- an integer L > 0 is chosen and the last L terms in Z are appended at the beginning of Z to form a new vector Z p .
- a cyclic prefix of length L is added.
- Z ⁇ Z N+L J [Z N _ L , Z N _ L+l ,... ,Z N , Z l , Z 2 ,... ,Z N .
- the output of the vector precoding (IDFT) block is the sequence of complex numbers
- This sequence is pulse shaped to obtain the baseband signal, as follows.
- the pulse shaping filter T i s the symbol period (in seconds)
- ⁇ is the phase
- ⁇ is the duration of the burst (in seconds).
- the linearized GMSK pulse shaping filter is used, see 3GPP TS 45.004 Modulation.
- This is a partial response pulse, which introduces a significant amount of intersymbol interference (ISI) in the transmitted signal. Therefore, the length L of the cyclic prefix must be chosen large enough to cover not only the time dispersion in the radio channel and the receive filtering but also the large time dispersion introduced by the pulse shaping filter. This entails a larger overhead and therefore a loss of bandwidth.
- the size N 0 f the IDFT is not a highly composite number.
- FFT's also decrease the power consumption in the MS. For example, at the normal symbol rate
- one of the first tasks performed in a typical receiver for precoded EGPRS is Cyclic Prefix (CP) removal.
- CP Cyclic Prefix
- ISI intersymbol interference
- a shortened precoded EGPRS burst is provided.
- the burst shortening is performed while preserving the spectral characteristics of the signal.
- a method of transmitting a burst of signals in a cellular radio system supporting data transmission using EGPRS/EGPRS2 is provided.
- the method comprises providing additional symbols in the EGPRS/EGPRS2 burst thereby forming a long burst, and pulse shaping the long burst to forming a long baseband signal whose duration exceeds the duration of one EGPRS/EGPRS2 time slot.
- the long baseband signal is then shortened to a shortened burst having the duration of an EGPRS/EGPRS2 time slot wherein the shortened burst fulfills the same spectrum mask requirement as the
- EGPRS/EGPRS2 burst which can be transmitted as a conventional EGPRS/EGPRS2 burst.
- the burst length of the long burst is set to 144 symbols.
- the transmitted symbols are precoded.
- the additional symbols are payload and/or training symbols.
- the shortened burst is generated by truncation of said long baseband signal followed by multiplication by a window function.
- a long burst containing more payload or training symbols than an EGPRS/EGPRS2 burst is shortened to the same length as an EGPRS/EGPRS2 burst and fulfill the same spectrum mask requirements.
- the additional symbols can be used to increase throughput (more data symbols), improve link performance (more training symbols or lower code rates), or for other purposes such as Peak to Average Power Ratio (PAPR) reduction.
- PAPR Peak to Average Power Ratio
- burst shortening alleviates the problems with precoded EGPRS/EGPRS2 presented above while preserving backward compatibility with EGPRS/EGPRS2, and without any losses in link performance.
- the precoded EGPRS signal bursts are shortened.
- the invention also extends to a device adapted to transmit signals in accordance with the above.
- the device can typically be implemented in a module comprising a micro controller or a micro processor operating on a set of computer program instructions stored in a memory, which instructions when executed by the module causes the module to perform power control in accordance with the method as described above.
- the module can comprise controller circuitry for performing the above methods.
- the controller(s) can be implemented using suitable hardware and or software.
- the hardware can comprise one or many processors that can be arranged to execute software stored in a readable storage media.
- the processor(s) can be implemented by a single dedicated processor, by a single shared processor, or by a plurality of individual processors, some of which may be shared or distributed.
- a processor or may include, without limitation, digital signal processor (DSP) hardware, ASIC hardware, read only memory (ROM), random access memory (RAM), and/or other storage media.
- DSP digital signal processor
- Fig. 1 is a high level view of a transmitter for precoded EGPRS/EGPRS2,
- - Fig. 2 is a flow chart illustrating some steps performed when transmitting a burst of EGPRS/EGPRS2 symbols
- - Fig. 3 is a view of a transmitter
- Fig. 4 is a flow chart illustrating some steps performed when transmitting a burst of EGPRS/EGPRS2 symbols
- Fig. 5 depicts a spectrum mask
- burst formats of the form (4) without tail symbols For simplicity, the below examples consider burst formats of the form (4) without tail symbols. However, the invention is not limited to such an embodiment but is equally applicable to other formats.
- Fig. 2 is a flow chart illustrating some steps performed when transmitting a burst of EGPRS/EGPRS2 symbols.
- a step 201 additional symbols are added to a (conventional) EGPRS/EGPRS2 burst thereby forming a long burst.
- the long burst is pulse shaped thereby forming a long baseband signal whose duration exceeds the duration of one EGPRS/EGPRS2 time slot.
- the long baseband signal is shortened to a shortened burst having the duration of an
- the shortened burst fulfills the same spectrum mask requirement as the EGPRS/EGPRS2 burst, the shortened burst is then transmitted in a step 207.
- a transmitter 300 that can be used for transmitting bursts of data in accordance with the methods described herein is depicted.
- the transmitter 300 comprises controller circuitry 301 for performing the above methods.
- the controller(s) can be implemented using suitable hardware and or software.
- the hardware can comprise one or many processors that can be arranged to execute software stored in a readable storage media.
- the processor(s) can be implemented by a single dedicated processor, by a single shared processor, or by a plurality of individual processors, some of which may be shared or distributed.
- a processor or may include, without limitation, digital signal processor (DSP) hardware, ASIC hardware, read only memory (ROM), random access memory (RAM), and/or other storage media.
- DSP digital signal processor
- a positive integer ⁇ ⁇ Z- an( j enlarge the burst by ⁇ symbols step 401.
- These symbols can be either payload, pilots or have some other use such as PAPR reduction.
- the vector of payload plus data is enlarged, step 403.
- the new symbols need not be added at the end, they can be placed anywhere in the burst.
- Guard symbols are added to the left and right of (7), step 415.
- guard symbols can be made by picking them so that the signal generated after pulse shaping has approximately constant amplitude over the guard.
- the pulse shaping filter is the linearized Gaussian Minimum Shift Keying (GMSK) filter
- the guard symbols may be defined by, step 413.
- the positive real numbers ' , r are the amplitudes of the left and right guard symbols step 411. These amplitudes can be adjusted to control the power of the signal during ramp up or ramp down.
- the signal (9) is pulse shaped, step 417 using the filter ⁇ .
- the signal (12) is seconds longer than the signal (5).
- step 419 is given how to shorten (12) so that
- the constant ⁇ is chosen in such a way that the time dispersion induced by the multipath propagation radio channel (i.e. from transmit antenna to receive antenna) plus time dispersion caused by the receive chain is less than / seconds.
- step 421 two raised cosine ramp functions are defined, step 421.
- the parameter " determines the duration of the ramping period.
- the received signal can still be accurately represented as a cyclic convolution of the sent symbols with a channel filter. This is a property that allows easy demodulation by means of the DFT, and it explains why the shortened signal (16) does not suffer from degraded performance. Moreover, the spectrum of the product of the ramps (14) and (15) is easily obtained from the usual raised cosine spectrum and its impulse response, see Digital Communications, J. Proakis, Mc Graw Hill 4 th Ed. (2000), but
- me signal (12) can be extended to i ⁇ ⁇ or i > T + without affecting the burst shortening method. This can be useful in order to ensure that the spectrum of (12) is as narrow as possible and that the high frequency components decay as fast as possible. It is also clear from the description above that the raised cosine ramps (14) and (15) can be replaced by other ramping functions provided the spectrum of the shortened signal (16) satisfies the same spectrum mask requirements as (5).
- FIG. 4 An exemplary burst shortening method is depicted in Fig. 4, which illustrates some procedural steps in accordance with the method described above
- Table 1 gives an example of typical parameter values that can be used in an embodiment of the invention which is backwards compatible with EGPRS/EGPRS2 at the normal symbol rate.
- the size of the Fourier transform is N + ⁇ - 144 - 2 x 3 ? which is a highly composite number.
- the amount of time dispersion due to multipath radio propagation and receive filtering that can be effectively compensated is ⁇ ⁇ 18-5 s with these values of the parameters the spectrum mask requirement for normal symbol rate, see 3 GPP TS 45.005 Radio
- Fig. 5 shows the spectrum of a shortened, IDFT precoded burst and a spectrum mask requirement in accordance with 3GPP TS 45.005 Radio Transmission and Reception.
- Fig. 6 shows burst power vs. time for shortened, IDFT precoded bursts. Also shown is the left part of power vs. time mask in accordance with 3GPP TS 45.005 Radio
- Fig. 7 illustrates power vs. time for shortened, IDFT precoded bursts. Also shown is the right part of power vs. time mask in accordance with 3GPP TS 45.005 Radio
- a tool for simplifying the computational burden on the precoder is provided. This is essential for backward compatibility with legacy base stations. Moreover a more effective FFT also saves battery and processing time in the mobile station. In addition it is possible to preserve the spectrum mask of EGPRS/EGPRS2.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Power Engineering (AREA)
- Mobile Radio Communication Systems (AREA)
- Transmitters (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11715297.5A EP2548350B1 (en) | 2010-03-17 | 2011-03-03 | Method and device for transmission of signals in a gsm system |
BR112012023425A BR112012023425A2 (en) | 2010-03-17 | 2011-03-03 | method and device for transmitting signals in a gsm system |
ZA2012/07803A ZA201207803B (en) | 2010-03-17 | 2012-10-17 | Method and device for transmission of signals in a gsm system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US31466610P | 2010-03-17 | 2010-03-17 | |
US61/314,666 | 2010-03-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011115545A1 true WO2011115545A1 (en) | 2011-09-22 |
Family
ID=44210022
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2011/050240 WO2011115545A1 (en) | 2010-03-17 | 2011-03-03 | Method and device for transmission of signals in a gsm system |
Country Status (5)
Country | Link |
---|---|
US (1) | US8565340B2 (en) |
EP (1) | EP2548350B1 (en) |
BR (1) | BR112012023425A2 (en) |
WO (1) | WO2011115545A1 (en) |
ZA (1) | ZA201207803B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8675512B2 (en) * | 2008-09-02 | 2014-03-18 | Commonwealth Scientific And Industrial Research Organisation | Fixed multiple access wireless communication |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1798922A1 (en) * | 2005-12-13 | 2007-06-20 | Koninklijke Philips Electronics N.V. | Transmitter device and method of transmission with attenuation of unwanted spectra |
WO2007092945A2 (en) * | 2006-02-08 | 2007-08-16 | Qualcomm Incorporated | Spectral shaping to reduce peak-to-average ratio in wireless communication |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2547650A1 (en) * | 2006-04-04 | 2007-10-04 | Tenxc Wireless Inc. | Method and apparatus for adaptive beamforming in an antenna array system for wireless communications |
WO2007130578A2 (en) * | 2006-05-04 | 2007-11-15 | Quantenna Communications, Inc. | Multiple antenna receiver system and method |
WO2008129408A2 (en) * | 2007-04-23 | 2008-10-30 | Nokia Corporation | Usage of feedback information for multimedia sessions |
-
2011
- 2011-03-03 WO PCT/SE2011/050240 patent/WO2011115545A1/en active Application Filing
- 2011-03-03 EP EP11715297.5A patent/EP2548350B1/en active Active
- 2011-03-03 US US13/039,377 patent/US8565340B2/en active Active
- 2011-03-03 BR BR112012023425A patent/BR112012023425A2/en not_active Application Discontinuation
-
2012
- 2012-10-17 ZA ZA2012/07803A patent/ZA201207803B/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1798922A1 (en) * | 2005-12-13 | 2007-06-20 | Koninklijke Philips Electronics N.V. | Transmitter device and method of transmission with attenuation of unwanted spectra |
WO2007092945A2 (en) * | 2006-02-08 | 2007-08-16 | Qualcomm Incorporated | Spectral shaping to reduce peak-to-average ratio in wireless communication |
Non-Patent Citations (3)
Title |
---|
BASUKI E PRIYANTO ET AL: "A spectrum shaping technique to control spectrum emission of UTRA LTE user equipment", NORCHIP, 2007, IEEE, PISCATAWAY, NJ, USA, 19 November 2007 (2007-11-19), pages 1 - 4, XP031240527, ISBN: 978-1-4244-1516-8 * |
HONGYING YAN ET AL: "IMPROVED MODULATION TECHNIQUES FOR WIRELESS COMMUNICATIONS : RAISED COSINE FILTERED FQPSK - FQPSK(RC)", IEEE TRANSACTIONS ON BROADCASTING, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 43, no. 2, 1 June 1997 (1997-06-01), pages 221 - 226, XP011006074, ISSN: 0018-9316, DOI: DOI:10.1109/11.598373 * |
J. PROAKIS: "Digital Communications", 2000, MC GRAW HILL |
Also Published As
Publication number | Publication date |
---|---|
EP2548350A1 (en) | 2013-01-23 |
US8565340B2 (en) | 2013-10-22 |
ZA201207803B (en) | 2016-01-27 |
BR112012023425A2 (en) | 2016-06-07 |
EP2548350B1 (en) | 2014-12-10 |
US20110228879A1 (en) | 2011-09-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US10938876B2 (en) | Method and system for low data rate transmission | |
EP3039834B1 (en) | Method and apparatus for transmitting a signal with constant envelope | |
US8259845B2 (en) | Method and apparatus for communicating with root-nyquist, self-transform pulse shapes | |
US7948868B2 (en) | Method and arrangement relating to the insertion of pilot tones in the frequency domain in SC-FDMA | |
EP2235896B1 (en) | A receiver for muros adapted to estimate symbol constellation using training sequences from two sub-channels | |
US10701685B2 (en) | Method and apparatus for asynchronous OFDMA/SC-FDMA | |
US20100074244A1 (en) | Method and apparatus for multiplexing data and reference signal in a wireless communication system | |
CN109952748A (en) | The synthesis of the nearly permanent mould waveform of high-frequency transmission | |
WO2010004586A2 (en) | Method and system for signal transmission and reception | |
CN102726015A (en) | Method and arrangement in a telecommunication system | |
WO2014139562A1 (en) | Scalable bandwidth design for ofdm | |
EP2011294A2 (en) | Low complexity method and apparatus to generate a symmetric-periodic continuos phase modulation (cpm) waveform | |
US9674024B2 (en) | Method for transmitting a signal with a preamble and corresponding devices, signal with corresponding preamble for synchronization of a receiver | |
US8731121B2 (en) | Method and arrangement in a telecommunication system | |
US8743946B2 (en) | Frequency-domain equalization and combining for single carrier transmission | |
EP3480985B1 (en) | Method and apparatus for signal transmission | |
CN107438041B (en) | Method and device for sending signal and receiving signal | |
US9306691B2 (en) | Methods and devices for transmission of signals in a telecommunication system | |
WO2011115545A1 (en) | Method and device for transmission of signals in a gsm system | |
JP7527693B2 (en) | Transmitter, transmitting method, receiver, and receiving method | |
KR20170060862A (en) | A transmitter and a receiver robust to frequency offset in orthogonal frequency division multiplexing communication | |
CN114844752A (en) | Data sending method, data receiving method and related device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 11715297 Country of ref document: EP Kind code of ref document: A1 |
|
DPE2 | Request for preliminary examination filed before expiration of 19th month from priority date (pct application filed from 20040101) | ||
WWE | Wipo information: entry into national phase |
Ref document number: 2011715297 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2967/KOLNP/2012 Country of ref document: IN |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01A Ref document number: 112012023425 Country of ref document: BR |
|
ENP | Entry into the national phase |
Ref document number: 112012023425 Country of ref document: BR Kind code of ref document: A2 Effective date: 20120917 |