EP2090049A1 - Appareil et procédé de modulation par déplacement de phase différentielle-d'amplitude - Google Patents
Appareil et procédé de modulation par déplacement de phase différentielle-d'amplitudeInfo
- Publication number
- EP2090049A1 EP2090049A1 EP07851250A EP07851250A EP2090049A1 EP 2090049 A1 EP2090049 A1 EP 2090049A1 EP 07851250 A EP07851250 A EP 07851250A EP 07851250 A EP07851250 A EP 07851250A EP 2090049 A1 EP2090049 A1 EP 2090049A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dpsk
- pilot signals
- ask
- amplitude
- shift keying
- 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- Withdrawn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
- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000010363 phase shift Effects 0.000 title claims abstract description 26
- 238000010586 diagram Methods 0.000 claims description 8
- 108010076504 Protein Sorting Signals Proteins 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 description 40
- 238000004088 simulation Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000005562 fading Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 238000007476 Maximum Likelihood Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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
-
- 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
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/389—Demodulator circuits; Receiver circuits with separate demodulation for the phase and amplitude components
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
-
- 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
- H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
- H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
- H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
- H04L27/2067—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
- H04L27/2071—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states in which the data are represented by the carrier phase, e.g. systems with differential coding
-
- 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
- H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
- H04L27/2053—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases
- H04L27/206—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers
- H04L27/2067—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states
- H04L27/2075—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using more than one carrier, e.g. carriers with different phases using a pair of orthogonal carriers, e.g. quadrature carriers with more than two phase states in which the data are represented by the change in carrier phase
-
- 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
- H04L27/3461—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel
- H04L27/3483—Modifications of the signal space to allow the transmission of additional information in order to transmit a subchannel using a modulation of the constellation points
-
- 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
- H04L27/36—Modulator circuits; Transmitter circuits
- H04L27/361—Modulation using a single or unspecified number of carriers, e.g. with separate stages of phase and amplitude modulation
-
- 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
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
Definitions
- the present invention relates to digital communication, and more particularly, to an amplitude-differential phase shift keying (A-DPSK) modulation apparatus capable of improving a transmission speed while guaranteeing compatibility with a conventional system.
- A-DPSK amplitude-differential phase shift keying
- a typical method of increasing a data transmission speed is to increase the number of constellation points.
- a multilevel modulation technique such as quadrature amplitude modulation (16-QAM) that is one of a plurality of widely used methods in a broadcasting system, such as a digital video broadcasting- terrestrial (DVB-T) system. Since the 16-QAM is an in-phase modulation technique, pilot signals have to be transmitted so as to estimate a channel for in-phase demodulation in a receiver. Since the pilot signals, except a phase reference symbol (PRS), are not provided in the terrestrial DMB system, the 16-QAM technique compatible with a conventional system is not suitable for a modulation method of increasing the data transmission speed of the terrestrial DMB system.
- PRS phase reference symbol
- Another method for increasing a data transmission speed is a 16-differential amplitude phase shift keying (16-D APSK) modulation method which does not need pilot signals, channel estimation, or equalization.
- This method operates well in a slow fading channel environment with comparatively constant channel coefficients over two or more continuous OFDM symbol periods. However, since the channel coefficients changes largely between neighboring OFDM symbol periods in a fast fading channel environment in which a terminal moves fast, this method may not operate well.
- the present invention provides an amplitude-differential phase shift keying
- amplitude-differential phase shift keying modulation apparatus including: a first modulation unit for DPSK (differential phase shift keying) -modulating a first data sequence; a second modulation unit for ASK (amplitude shift keying)-modulating a second data sequence and inserting pilot signals into the ASK-modulated signal; and a multiplier for multiplying outputs of the first and second modulation units and outputting the multiplication result.
- DPSK differential phase shift keying
- ASK amplitude shift keying
- amplitude-differential phase shift keying demodulation apparatus including: a first demodulation unit for receiving an A-DPSK-modulated signal and DPSK-de- modulating the received signal; a second demodulation unit for extracting pilot signals from the received signal, removing the extracted pilot signals from the received signal, and ASK-demodulating the pilot signals removed A-DPSK-modulated signal.
- DPSK amplitude-differential phase shift keying modulation method including: DPSK (differential phase shift keying)-modulating a first data sequence; ASK (amplitude shift keying)-modulating a second data sequence; inserting pilot signals into the ASK- modulated signal; and multiplying the DPSK-modulated signal sequence by the pilot signals inserted ASK-modulated signal sequence.
- a modulation method including: generating a plurality of constellation points with multi- phases having a first amplitude in a constellation diagram by DPSK-modulating a first data sequence; and modulating a second data sequence so as to further generate a plurality of constellation points whose amplitudes are separated from the first amplitude at constant intervals.
- a demodulation method including: DPSK (differential phase shift keying) -demodulating a received signal which is A-DPSK modulated; extracting pilot signals from the received signal; estimating a channel through which the received signal is transmitted using the extracted pilot signals and outputting amplitudes of the pilot signals from the estimated channel value; removing the pilot signals with the amplitudes from the received signal; and ASK-demodulating the received signals with the pilot signals removed.
- DPSK differential phase shift keying
- FIG. 1 is a block diagram illustrating an amplitude-differential phase shift keying
- FIG. 2 illustrates a constellation diagram of amplitude-differential quadrature phase shift keying (A-DQPSK) modulation data
- FIG. 3 is a block diagram illustrating an A-DPSK demodulation apparatus according to an embodiment of the present invention.
- FIG. 4 illustrates simulation results showing receiving performance of a conventional differential quadrature phase shift keying (DQPSK) receiver with respect to an A- DQPSK signal according to the present invention, a conventional DQPSK signal, and a differential amplitude phase shift keying (DAPSK) signal; and
- DQPSK differential quadrature phase shift keying
- DAPSK differential amplitude phase shift keying
- FIG. 5 illustrates simulation results showing receiving performance with respect to an A-DPSK signal and a DAPSK signal under the same condition as shown in FIG. 4.
- FIG. 1 is a block diagram illustrating an amplitude-differential phase shift keying
- the A-DPSK modulation apparatus shown in FIG.1 can be employed in a terrestrial digital multimedia broadcasting (DMB) system in which a differential phase shift keying (DPSK) or a differential quadrature phase shift keying (DQPSK) technique is applied to an orthogonal frequency division multiplexing (OFDM) technique.
- DMB digital multimedia broadcasting
- DPSK differential phase shift keying
- DQPSK differential quadrature phase shift keying
- OFDM orthogonal frequency division multiplexing
- the A-DPSK modulation apparatus operates based on a modulation method of transmitting main transmission data together with additional transmission data.
- the main transmission data is modulated according to the conventional DPSK modulation method.
- the additional transmission data is modulated according to another method different from the DPSK method so as to provide an additional service besides the main transmission data.
- the A-DPSK modulation apparatus includes a DPSK unit 10 which DPSK-modulates the main transmission data, an amplitude shift keying (ASK) unit 11 which ASK-modulates the additional transmission data, a pilot insertion unit 12 which inserts a pilot into the modulated additional transmission signal, and a multiplier 13.
- a reference numeral 14 denotes a unit for converting the output A-DPSK signal into an orthogonal frequency division multiplexing (OFDM) symbol.
- the DPSK unit 10 outputs a transmission symbol generated from the input main transmission data and to be transmitted next, the phase of which is determined relatively to the one of the immediately previously transmitted symbol.
- the ASK unit 11 allocates an amplitude of a subcarrier differently according to the input additional transmission data. For example, when the additional transmission data is 1, the amplitude of the subcarrier signal is set to ⁇ . When the additional transmission data is 0, the amplitude of the subcarrier signal is set to ⁇ + ⁇ .
- the pilot insertion unit 12 periodically or non-periodically inserts pilot signals into a modulated signal output from the ASK unit 11. For example, a pilot signal may be inserted into a location of every tenth subcarrier of the modulated signal output from th e ASK unit 11. Alternatively, pilot signals may be inserted into a location after the modulated signals output from the ASK unit 11. Both the transmitting and receiving sides know which subcarrier positions the pilot signals are located at.
- the multiplier 13 multiplies the output data of the DPSK unit 10 by the output signal of the pilot insertion unit 12 and outputs the multiplication result.
- FIG. 2 is a constellation diagram of A-DQPSK data in which DPSK and ASK modulation orders are 2.
- constellation points for the additional transmission data are generated additionally at a constant interval ⁇ in the constellation points of DPSK data for the main transmission data.
- parameters ⁇ and ⁇ are used to determine a bit error rate of the additional transmission data, except the main transmission data, transmitted through the conventional system and compatibility with the conventional system.
- the conventional terrestrial DMB data has to be DQPSK-modulated modulation, while the additional transmission data has to ASK-modulated.
- the conventional terrestrial DMB receiver can successfully demodulate data corresponding to a conventional terrestrial DMB service by considering the A-DQPSK modulated signals and the DAQPSK modulated signals as the DQPSK modulated signals.
- FIG. 3 is a block diagram illustrating an A-DPSK demodulation apparatus according to an embodiment of the present invention.
- the shown A-DPSK demodulation apparatus illustrated in FIG. 3 includes a main transmission signal demodulation unit 31 and an additional transmission signal demodulation unit 32.
- the main transmission signal demodulation unit 31 outputs the main transmission signal by DPSK-demodulating signals received through a channel and then OFDM- demodulated.
- the DPSK demodulation is performed by using the conventional demodulation method which uses, for example, a one-symbol delay and a complex conjugate multiplier.
- the additional transmission signal demodulation unit 32 includes a pilot extraction unit 321, a channel amplitude estimation unit 322, a pilot removing unit 323, and an ASK demodulation unit 324.
- the pilot extraction unit 321 Since the pilot extraction unit 321 knows the locations of the pilot signals, the pilot extraction unit 321 extracts a pilot from a signal which is received through a channel and OFDM-demodulated.
- the channel amplitude estimation unit 322 performs channel estimation by using the extracted pilot and extracts only amplitude from the estimated channel value.
- One of conventional channel estimation methods comprising least square estimation and maximum likelihood estimation may be employed as the channel estimation method.
- the pilot removing unit 323 removes the pilot signals from the transmission signal into which the pilot signals are inserted.
- the ASK demodulation unit 324 outputs the additional transmission data by demodulating the signal from which the pilot signals are removed by using the estimated amplitude.
- FIG. 4 illustrates simulation results showing receiving performance of a conventional
- DQPSK receiver with respect to an A-DQPSK signal according to the present invention, conventional DQPSK and differential amplitude phase shift keying (DAPSK) signals.
- the simulation is performed with respect to DAB transmission mode 1.
- a carrier frequency is 200 MHz, a bandwidth is 1.536 MHz, and a frame length is 96 ms.
- a frame is constructed with 76 OFDM symbols. Each OFDM symbol is constructed with 1,536 subcarriers with an interval of 1 kHz.
- FIG. 5 illustrates the receiving performance of the A-DPSK modulation technique and the DAPSK modulation technique under the same conditions as the case shown in FIG. 4.
- the receiving performances of the DAPSK and A-DPSK modulation techniques become largely deteriorated due to interference between subcarriers.
- the receiving performance of the DAPSK modulation technique becomes deteriorated more than that of the A-DPSK modulation technique.
- the A-DPSK signal method can improve receiving performance of the terrestrial DMB system in a mobile receiving environment compared with the DAPSK signal method.
- FIGS. 4 and 5 are cases applied for increasing a data transmission speed of the terrestrial DMB system.
- the A-DPSK signal method suggested in the present invention can be applied to various digital communication or broadcasting systems besides the terrestrial DMB system.
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020060124121A KR20080052085A (ko) | 2006-12-07 | 2006-12-07 | 크기 차동 위상 편이 변조 장치 및 그 방법 |
PCT/KR2007/006259 WO2008069556A1 (fr) | 2006-12-07 | 2007-12-04 | Appareil et procédé de modulation par déplacement de phase différentielle-d'amplitude |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2090049A1 true EP2090049A1 (fr) | 2009-08-19 |
EP2090049A4 EP2090049A4 (fr) | 2011-11-30 |
Family
ID=39492367
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07851250A Withdrawn EP2090049A4 (fr) | 2006-12-07 | 2007-12-04 | Appareil et procédé de modulation par déplacement de phase différentielle-d'amplitude |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2090049A4 (fr) |
KR (1) | KR20080052085A (fr) |
WO (1) | WO2008069556A1 (fr) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102739591B (zh) * | 2012-06-29 | 2014-12-17 | 东南大学 | 一种多元位置3值mcp-ebpsk调制和解调方法 |
CN103795665A (zh) * | 2013-11-15 | 2014-05-14 | 上海交通大学 | 基于基片集成波导互连的qpsk高速数据传输系统 |
CN103647737B (zh) * | 2013-12-20 | 2016-09-21 | 东南大学 | Mppsk调制的跳时多址实现方法 |
CN110611633B (zh) * | 2018-06-14 | 2021-01-29 | 大唐移动通信设备有限公司 | 一种16幅度相位键控信号的处理方法和装置 |
US20220263687A1 (en) * | 2019-07-29 | 2022-08-18 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and apparatus for phase-aided adaptive modulation |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1624637A1 (fr) * | 2003-05-14 | 2006-02-08 | Diseno de Sistemas en Silicio S.A. | Procede de modulation differentielle en phase et coherente en amplitude normalisee pour une communication multi-utilisateur |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3419057A1 (de) | 1984-05-22 | 1985-11-28 | Power Industrieanlagenplanungs GmbH, Wiener Neustadt | Presse zum aufbringen einer schicht auf eine traegerplatte, insbesondere eine scheibenbremsbelagtraegerplatte |
JPH11136206A (ja) * | 1997-10-24 | 1999-05-21 | Matsushita Electric Ind Co Ltd | データ伝送装置 |
US6157254A (en) * | 1998-09-29 | 2000-12-05 | Lucent Technologies Inc. | Double side band pilot technique for a control system that reduces distortion produced by electrical circuits |
-
2006
- 2006-12-07 KR KR1020060124121A patent/KR20080052085A/ko not_active Application Discontinuation
-
2007
- 2007-12-04 EP EP07851250A patent/EP2090049A4/fr not_active Withdrawn
- 2007-12-04 WO PCT/KR2007/006259 patent/WO2008069556A1/fr active Application Filing
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1624637A1 (fr) * | 2003-05-14 | 2006-02-08 | Diseno de Sistemas en Silicio S.A. | Procede de modulation differentielle en phase et coherente en amplitude normalisee pour une communication multi-utilisateur |
Non-Patent Citations (2)
Title |
---|
FISCHER R F H ET AL: "DIFFERENTIAL ENCODING STRATEGIES FOR TRANSMISSION OVER FADING CHANNELS", AEU INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS, ELSEVIER, JENA, DE, vol. 54, no. 1, 1 January 2000 (2000-01-01), pages 59-66, XP000963698, ISSN: 1434-8411 * |
See also references of WO2008069556A1 * |
Also Published As
Publication number | Publication date |
---|---|
KR20080052085A (ko) | 2008-06-11 |
EP2090049A4 (fr) | 2011-11-30 |
WO2008069556A1 (fr) | 2008-06-12 |
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Inventor name: LIM, JONG-SOO Inventor name: KWON, DAE-KEN Inventor name: KIM, YOUNG-SU Inventor name: KIM, HYOUNG-NAM Inventor name: CHOI, SEOMEE Inventor name: LIM, HYOUNGSOO |
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