WO2015099556A1 - Метод передачи и приема сигналов кам (квадратурной амплитудной модуляции) - Google Patents
Метод передачи и приема сигналов кам (квадратурной амплитудной модуляции) Download PDFInfo
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- WO2015099556A1 WO2015099556A1 PCT/RU2013/001156 RU2013001156W WO2015099556A1 WO 2015099556 A1 WO2015099556 A1 WO 2015099556A1 RU 2013001156 W RU2013001156 W RU 2013001156W WO 2015099556 A1 WO2015099556 A1 WO 2015099556A1
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- 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
- H04L27/3488—Multiresolution systems
Definitions
- This invention relates to the field of transmission and reception of QAM signals using hierarchical modulation methods.
- KAM 2048 and higher signals are already in use. But increasing the QAM number in the communication channel leads to a deterioration in its energy efficiency, since the higher the QAM number, the greater the gap between the signal-to-noise ratio for error-free reception for error-free reception and the Shannon limit. So, for example, KAM 512 with a coding rate of 8/9 requires a signal-to-noise ratio of 33 - 34 dB for receiving information with an error probability of 10 "7 , and the Shannon limit for this case lies at 24 dB.
- the proposed invention improves the energy efficiency of the digital communication channel while maintaining its spectral efficiency and the probability of error-free reception and reduces the requirements for phase stability and generator equipment of modems.
- This invention involves the use in a digital communication channel instead of a single QAM signal with a high number, a superposition of several QAM signals with lower numbers (what is often called hierarchical modulation), which allows to increase the energy efficiency of the channel while maintaining its spectral efficiency.
- the input information bit stream at the transmitting end is not converted to a single QAM signal. possessing a given spectral efficiency, it is converted into several partial QAM signals with lower numbers having equal total spectral efficiency, which are then added in a certain proportion to a single signal. This proportion depends on the applied types of modulation and error-correcting coding and should provide sequential decoding of partial signals with a given error probability at the minimum possible power of these signals at the receiving end.
- the minimization of the power of partial signals in this patent is ensured by rotating each odd (or each even) partial signal in phase by an angle ⁇ (optimal, from the point of view of energy efficiency, is an angle ⁇ of 22.5 degrees) and a time delay of each signal
- Fig. 1 is a functional diagram of a telecommunication system for transmitting an information signal by representing it in the form of two partial QAM signals, implemented using the proposed method.
- Fig.2 phase portrait of the total signal obtained by modeling the proposed system in the absence of phase and time shifts between two partial QPSK signals.
- Fig.3 phase portrait of the total signal obtained as a result of modeling the proposed system with a phase shift between partial QPSK signals of 22.5 degrees.
- Fig.4 is a phase portrait of the total signal obtained by modeling the proposed system with a time shift between two partial QPSK signals equal to half the period of the symbol frequency.
- FIG. 1 An example of a telecommunication system implemented using the proposed method is presented in Fig. 1.
- the system consists of a transmitter 100, a receiver 200, and a communication channel 300.
- the transmitter 100 is implemented using the transmission method 1 of the claims.
- a signal 102 is applied to the input of the transmitter. This is a character
- a digital data stream which demultiplier 104 is divided into two bit streams.
- the first stream on line 106 goes to encoder 1 10
- the second stream on line 108 goes to encoder 1 12.
- the encoded first bit stream on line 1 14 goes to converter 1 18 to form a complex character stream 122 - KAMI.
- the encoded second bitstream on line 1 16 is fed to converter 120 to form a complex symbol stream 124 — KAM2.
- the integrated KAMI symbol stream on line 122 enters the phase shifter 126, where it rotates through an angle ⁇ and on line 130 enters the adder 134.
- the complex KAM2 symbol stream on line 124 enters the delay device 128, where it is held at a certain fraction of T s (the period of the characters).
- the delayed signal KAM2 is summed in the adder 134 with the KAMI signal in a proportion that provides sequential decoding of the KAMI and KAM2 signals at the receiving end with a given error probability.
- the ratio of their powers should be greater than or equal to K + 1, where K is the ratio of the power of the signal with lower energy (KAM2 signal) to the noise power that is minimally necessary to receive this signal with a given probability mistakes.
- K depends on the type of error-correcting coding used and the chosen type of modulation.
- the total signal 136 is transferred to the carrier frequency 138 in the complex converter 140 and, via line 142, is output to the communication channel 300.
- the receiver 200 is implemented using method 2 of the claims.
- the input signal of the receiver 200 is a signal 310 that has passed the communication channel 300.
- This signal is demodulated in the demodulator 202, obtaining the total symbolic complex stream.
- This stream along line 204 is fed to converter 208, where it is converted into a sequence of metrics of bit samples (soft metric) corresponding to symbol samples of the signal with the highest energy.
- the total symbolic complex stream is supplied to delay device 222 to provide subsequent in-phase subtraction of signals.
- Line 210 follows The soft metrics are sent to decoder 212. After decoding in decoder 212, the bit data stream on line 214 goes to encoder 218. From its output, on line 220 goes to modulator 224, where it is converted to a complex symbol stream 228, equivalent to KAMI.
- Subtracting module 230 performs in-phase subtraction of the KAMI signal from the total symbolic complex signal stream.
- the KAM2 signal remains at the output of the module 230 against the background of its own noise, which is transmitted via line 232 to the converter 234, where it is converted into a sequence of metrics of bit samples corresponding to the symbolic samples of the KAM2 signal.
- the sequence of bit sample metrics is sent to decoder 238, where an information bitstream 2 is received, which in the multiplexer 242 is combined with bitstream 1 arriving there on line 216.
- the combined bitstream 244 is used by the device 200.
- Table I - Table III shows the results of modeling the proposed data transmission system using MATLAB using a superposition of two partial signals of the same modulation and LDPC coding with a block length of 64,000 bits and an error probability in the communication channel 10 ⁇ 7 .
- Table I shows the results of modeling the proposed system in the absence of phase and time shifts between partial signals
- Table II shows the simulation results of the proposed system with a phase shift between partial signals of 22.5 degrees and the absence of a temporary shift between them.
- Table III shows the simulation results of the proposed system with a time shift between partial signals equal to half the period of the symbol frequency.
- Patent EP 1 406 421 A2 Data transmission using hierarchical modulation.
- Patent M US 7,274,653
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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RU2016130002A RU2641448C1 (ru) | 2013-12-23 | 2013-12-23 | Способ передачи и приема сигналов кам (квадратурной амплитудной модуляции) |
PCT/RU2013/001156 WO2015099556A1 (ru) | 2013-12-23 | 2013-12-23 | Метод передачи и приема сигналов кам (квадратурной амплитудной модуляции) |
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PCT/RU2013/001156 WO2015099556A1 (ru) | 2013-12-23 | 2013-12-23 | Метод передачи и приема сигналов кам (квадратурной амплитудной модуляции) |
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WO2015099556A1 true WO2015099556A1 (ru) | 2015-07-02 |
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PCT/RU2013/001156 WO2015099556A1 (ru) | 2013-12-23 | 2013-12-23 | Метод передачи и приема сигналов кам (квадратурной амплитудной модуляции) |
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RU (1) | RU2641448C1 (ru) |
WO (1) | WO2015099556A1 (ru) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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RU2224375C2 (ru) * | 2001-07-30 | 2004-02-20 | Федеральное государственное унитарное предприятие Ростовский-на-Дону научно-исследовательский институт радиосвязи | Многофункциональная система приема, демодуляции и обработки сигналов i-iv уровней иерархического уплотнения |
RU2360373C2 (ru) * | 2004-01-21 | 2009-06-27 | Квэлкомм Инкорпорейтед | Обнаружение данных для передачи иерархически кодированных данных |
US20120154532A1 (en) * | 2010-12-17 | 2012-06-21 | Thales | Transmission method and system using an adaptive and programmable hierarchical modulation |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE60023337T2 (de) * | 1999-11-23 | 2006-04-20 | Thomson Licensing | Hierarchisches qam-übertragungssystem mit veränderlichem gruppierungsfaktor |
WO2001039455A1 (en) * | 1999-11-23 | 2001-05-31 | Thomson Licensing S.A. | Error detection/correction coding for hierarchical qam transmission systems |
WO2001039456A1 (en) * | 1999-11-23 | 2001-05-31 | Thomson Licensing S.A. | Gray encoding for hierarchical qam transmission systems |
JP3899005B2 (ja) * | 2002-10-03 | 2007-03-28 | 株式会社エヌ・ティ・ティ・ドコモ | 変調装置、変調方法、復調装置及び復調方法 |
US8144800B2 (en) * | 2004-09-18 | 2012-03-27 | Broadcom Corporatino | Downstream transmitter and cable modem receiver for 1024 QAM |
EP1878188B1 (en) * | 2005-05-04 | 2009-09-16 | Panasonic Corporation | Data transmissions in a mobile communication system employing diversity and constellation rearrangement of a 16 qam scheme |
EP2326055A4 (en) * | 2008-09-09 | 2014-08-06 | Fujitsu Ltd | TRANSMITTERS, TRANSMISSION PROCEDURES, RECEIVERS AND RECEIVER PROCEDURES |
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2013
- 2013-12-23 RU RU2016130002A patent/RU2641448C1/ru active
- 2013-12-23 WO PCT/RU2013/001156 patent/WO2015099556A1/ru active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2224375C2 (ru) * | 2001-07-30 | 2004-02-20 | Федеральное государственное унитарное предприятие Ростовский-на-Дону научно-исследовательский институт радиосвязи | Многофункциональная система приема, демодуляции и обработки сигналов i-iv уровней иерархического уплотнения |
RU2360373C2 (ru) * | 2004-01-21 | 2009-06-27 | Квэлкомм Инкорпорейтед | Обнаружение данных для передачи иерархически кодированных данных |
US20120154532A1 (en) * | 2010-12-17 | 2012-06-21 | Thales | Transmission method and system using an adaptive and programmable hierarchical modulation |
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