WO2003049474A1 - Appareil de communication a corps mobile - Google Patents
Appareil de communication a corps mobile Download PDFInfo
- Publication number
- WO2003049474A1 WO2003049474A1 PCT/JP2002/011749 JP0211749W WO03049474A1 WO 2003049474 A1 WO2003049474 A1 WO 2003049474A1 JP 0211749 W JP0211749 W JP 0211749W WO 03049474 A1 WO03049474 A1 WO 03049474A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- subcarriers
- base station
- subcarrier
- phase
- phase difference
- 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
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/005—Interference mitigation or co-ordination of intercell interference
- H04J11/0053—Interference mitigation or co-ordination of intercell interference using co-ordinated multipoint transmission/reception
-
- 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
- H04L27/2626—Arrangements specific to the transmitter only
-
- 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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
-
- 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
-
- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0057—Block codes
-
- 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
- H04L27/2614—Peak power aspects
- H04L27/2621—Reduction thereof using phase offsets between subcarriers
Definitions
- the present invention relates to a mobile communication system having a plurality of base stations, wherein each base station communicates the same data at the same time and at the same frequency with a mobile station using a multicarrier modulation scheme.
- a communication area is formed by a base station, and communication is performed between a mobile in this cell and the base station.
- a plurality of base stations are provided in a certain area, and a plurality of cells are partially formed. The same data is transmitted from each base station at the same time and at the same frequency.
- cells can be connected in a chain to form a wide communication area. Also, the burden on mobile stations can be minimized.
- the inventor of the present application has proposed a system for preventing deterioration of communication quality in a cell in which communication from two base stations interferes with each other.
- a mobile communication device that can communicate with a certain level of quality at any point.
- a first aspect of the mobile communication device of the present invention includes a phase adjusting unit that can set a phase difference between subcarriers when transmitting to a base station.
- a second aspect of the mobile communication device of the present invention relates to a method of assigning a phase difference to a subcarrier.
- a phase difference of 0 to 2 ⁇ may be allocated to a plurality of subcarriers at substantially equal intervals, or a phase difference of 0 to 2 ⁇ may be randomly allocated to a plurality of subcarriers.
- a third aspect of the mobile communication device of the present invention is to allocate a phase difference between subcarriers of a base station in consideration of a phase shift based on a difference in propagation distance for each subcarrier at a receiving point.
- FIG. 1 is a configuration diagram of a mobile communication system.
- FIG. 2 is a graph showing a change in received power intensity along a position D at which the cell moves from cell ⁇ to cell ⁇ .
- FIG. 3 is a graph showing a phase arrangement of subcarriers according to the embodiment of the present invention.
- FIG. 4 is a graph showing a phase arrangement when the phases of the subcarriers are all the same.
- FIG. 5 is a subcarrier power distribution diagram after the addition.
- FIG. 6 (A) is a graph of the received signal with the subcarrier frequency on the horizontal axis and the time t on the vertical axis. This shows a case where the mobile station does not move.
- Fig. 6 (B) is a graph of the received signal with the subcarrier frequency on the horizontal axis and the time t on the vertical axis, similar to Fig. 6 (A), showing the case where the mobile station moves in the cell.
- FIG. 7 is a diagram of the received electric field distribution of the subcarrier at the two time points tl and 2 shown in FIG. 6 (B).
- FIG. 8 is a graph showing a random phase arrangement of subcarriers according to another embodiment of the present invention.
- FIG. 9 is a subcarrier power distribution diagram after the addition.
- FIG. 10 (A) is a graph in which the subcarrier frequency is plotted on the horizontal axis and the time t is plotted on the vertical axis. This shows a case where the mobile station does not move.
- FIG. 10 (B) is a graph in which the subcarrier frequency is plotted on the horizontal axis and the time t is plotted on the vertical axis, as in FIG. 10 (A), and shows a case where the mobile station moves in the cell.
- FIG. 11 is a graph showing a general relationship between a correction success rate using an error correction code and the number of normal reception carriers.
- FIG. 12 is a circuit configuration block diagram of a transmitter used in the mobile communication device of the present invention.
- FIG. 13 is a block diagram of a circuit configuration of a receiver used in the mobile communication device of the present invention.
- FIG. 14 (A) is an explanatory diagram of the function of the interleave, and shows received data arranged on the frequency axis and the time axis.
- FIG. 14 (B) is an explanatory diagram of the function of the interleaving, similar to FIG. 14 (A), and shows data written in the column direction and rearranged into a code string of code length L.
- Base stations are denoted by A and B, and multiple subcarriers are denoted by f1, f2, ⁇ '.
- subcarrier fi emitted from base station A When subcarrier fi is emitted from base station A and subcarrier fi is emitted from base station B, subcarrier fi emitted from base station A is synchronized with subcarrier fi emitted from base station B. (The frequency is completely the same, and the phase difference does not change over time).
- the subcarrier fi of the radio wave emitted from the base station ⁇ and the subcarrier fi of the radio wave emitted from the base station B The phase difference ⁇ i from fi has a different value for each i. This means that for a subcarrier fi, where the phase difference ⁇ i becomes ⁇ , the phase difference ⁇ j does not become ⁇ for the other subcarriers f j (i ⁇ j). Therefore, even if one of the subcarriers is attenuated at any place in the communication area, the other subcarriers remain and communication is secured.
- the method of allocating the phase difference to the subcarriers may be such that a phase difference of 0 to 2 ⁇ may be allocated to a plurality of subcarriers at substantially equal intervals, or a phase difference of 0 to 2 ⁇ may be randomly allocated to a plurality of subcarriers. .
- the area where the received power in the communication area is almost the same is assumed to be a point almost equidistant from the base stations ⁇ and ⁇ .
- the base station antenna has directivity, etc.
- the areas where the received powers are almost equal are not necessarily located at the same distance from base stations A and ⁇ .
- the phase based on the propagation distance dl is 1 2 ⁇ dl / X
- the phase based on the propagation distance d2 is 1 2 ⁇ d2 / Xi.
- i is the propagation wavelength of the subcarrier f i.
- phase difference 2 ⁇ (d2-dl) / Ai based on this difference in propagation distance to the phase difference of subcarriers ii emitted from base stations A and B in advance.
- (1) 2 ⁇ (dl—d2) / Ai may be added to the phase of subcarrier fi emitted from base station A, and (2) subcarrier fi emitted from base station B.
- 2 ⁇ (d2-dl) ⁇ ⁇ may be applied to the phase of (3) or 2 ⁇ dl / ⁇ is added to the phase of the subcarrier fi emitted from the base station ⁇ , and the base station Fired from ⁇ Phase 2 ⁇ d2Zi may be added to the phase of subcarrier fi.
- Fig. 1 is a configuration diagram of a mobile communication system, where cells are formed by base stations A and B. It is assumed that the cells partially overlap, and that mobile station C exists therein.
- the mobile station C is, specifically, an in-vehicle navigation device, a mobile phone, a mobile PDA terminal, a personal computer, or the like.
- the carrier modulation method is the ODFM modulation method.
- implementation of the present invention is not limited to this, and other multicarrier modulation schemes can be adopted.
- the distance between base station A and mobile station C is d l, and the distance between base station B and mobile station C is d 2.
- Figure 2 is a graph showing the change in carrier reception power along position D from cell A to cell B (this graph does not take into account the interference between carriers).
- the received power of the emitted radio wave of base station A is indicated by PA
- the received power of the emitted radio wave of base station B is indicated by PB.
- the electric field cancels out at the point where the subcarrier phase difference becomes ⁇ , and the received power drops significantly.
- the received power does not drop significantly even if the subcarrier phase difference becomes ⁇ .
- FIG. 3 is a graph showing a phase arrangement of subcarriers according to the embodiment of the present invention.
- ⁇ subcarriers each of which is f1, f2, ⁇ , fN. It is assumed that the larger the suffix, the higher the frequency.
- the phase of one subcarrier f1 is set to 0, and the phases of the subcarriers after ⁇ 2 are arranged at equal intervals.
- FIG. 4 is a graph showing the phase arrangement when the phases of the subcarriers are all the same (0).
- the phase difference between the received subcarriers in mobile station C includes a phase difference of 27T (d1 ⁇ d2) ⁇ based on the propagation distance difference in advance.
- i is the subcarrier number
- N is the number of subcarriers
- i is the wavelength of the i-th subcarrier. Therefore, in order to compensate for the phase difference based on this propagation distance difference, the phase difference 2 ⁇ (d l-d 2) ZAi based on the propagation distance difference is added to the subcarriers emitted from base stations A and B. I will attach it.
- one base station emits a subcarrier to which the phase array 2 ⁇ / ⁇ shown in FIG. 3 is added, and the other base station emits a subcarrier to which the phase array shown in FIG. 4 is added.
- the subcarrier is fired at the phase of.
- the subcarriers with a phase difference around ⁇ decrease in power due to the weakening of the electric field, but the subcarriers with a phase difference of 0 or around 2 ⁇ reinforce each other. Therefore, it is possible to avoid a situation where the power of all subcarriers falls.
- Figure 6 is a graph with subcarriers on the horizontal axis and time t on the vertical axis.
- the subcarriers whose power drops exceed the threshold and whose error cannot be corrected by the mobile station receiver are indicated by hatching.
- FIG. 6 (A) shows a case where the mobile station does not move
- FIG. 6 (B) shows a case where the mobile station moves along the distance D within the cell.
- the subcarriers whose received power drops below the threshold are gradually changing.
- Figure 7 shows the received power distribution of the subcarrier at the two time points t1 and t2 shown in Fig. 6 (B).
- the subcarrier transmitted from the base station has a phase difference due to distance.
- the phase difference does not need to be considered, the phase arrangement may not be added.
- FIG. 8 is a graph showing the phase arrangement of subcarriers according to another embodiment of the present invention. It is assumed that the phases of the subcarriers f l, f 2,..., F N are randomly arranged.
- the subcarrier power distribution after the addition is as shown in FIG.
- the subcarrier whose phase difference is around 0 or 2 ⁇ is strong, and the subcarrier whose phase difference is around ⁇ is weak, but its arrangement is not regular.
- FIG. 10 is a graph in which the horizontal axis represents subcarriers and the vertical axis represents time t.
- the subcarriers whose power drops exceed the threshold and cannot be corrected by the mobile station receiver are indicated by hatching.
- FIG. 10 (A) shows a case where the mobile station does not move
- FIG. 10 (B) shows a case where the mobile station moves.
- the subcarriers whose received power drops below the threshold value change randomly.
- the phases of the subcarriers fl, f2,..., FN are randomly arranged (in contrast, in FIG. 3, each subcarrier f Since the phases of 1, f 2,..., F N change in the order of the carrier, in FIG. 6 (B), the subcarriers whose received power drops beyond the threshold value shift in order).
- FIG. 10 (A) shows a case where the mobile station does not move
- FIG. 10 (B) shows a case where the mobile station moves.
- the subcarriers whose received power drops below the threshold value change randomly
- the relationship between the correction success rate using an error correction code and the number of normal reception carriers is shown in FIG. According to the figure, if the number of normally received carriers is equal to or greater than a certain number Nc, the error can be corrected. However, if the number of normally received carriers is less than Nc, error correction becomes difficult.
- the number of subcarriers whose power drop exceeds the threshold is limited in any time section. Therefore, if the number of subcarriers can be set to less than Nc, the correction success rate can always be maintained at almost 1.
- the transmitter and the receiver have a common circuit configuration for the base station and the mobile station.
- FIG. 12 is a circuit configuration block diagram of the transmitter.
- the transmission data is encoded by an error correction encoding circuit 11 using Reed-Solomon code.
- rearrangement is performed in the interleave circuit 12 to make the error correction code effective.
- the SZP conversion circuit 13 performs conversion from a serial signal to a parallel signal.
- differential encoding circuit 14 functioning as a phase adjusting means
- differential encoding is performed by a flip-flop FF, and a reference phase at this time is given by adding a phase difference to each subcarrier.
- the method of providing the phase difference is as described with reference to FIGS.
- the differentially encoded signal is subjected to inverse Fourier transform by an inverse Fourier transform circuit 15, DQPSK-modulated by an analog transform circuit 16, frequency-converted, and fed to a transmitting antenna.
- FIG. 13 is a circuit configuration block diagram of the receiver.
- the high-frequency signal received by the antenna is frequency-converted, converted to a digital signal by the digital conversion circuit 21, and Fourier-transformed by the Fourier conversion circuit 22.
- 23 is a synchronous signal detection circuit
- 24 is a voltage controlled oscillator.
- the signal subjected to Fourier transform by the Fourier transform circuit 22 is subjected to differential decoding by the differential decoding circuit 25, and is converted from the parallel signal to a serial signal by the 3 transform circuit 26. Then, the codes are rearranged in the interleave circuit 27, the error correction coding circuit 28 is performed, and the data is output as received data.
- FIG. Fig. 14 (A) shows received data arranged on the frequency axis and the time axis. This received data is read out sequentially on the time axis, written in the column direction, and rearranged into codes of code length L as shown in FIG. 14 (B).
- the reference phases of a plurality of subcarriers can be arbitrarily assigned between 0 and 2 ⁇ .
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Discrete Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Mobile Radio Communication Systems (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/497,725 US7443921B2 (en) | 2001-12-04 | 2002-11-11 | Mobile body communication apparatus |
EP02788609A EP1463355B1 (en) | 2001-12-04 | 2002-11-11 | Mobile communication apparatus |
KR10-2004-7008417A KR20040064724A (ko) | 2001-12-04 | 2002-11-11 | 이동체 통신장치 |
IL16233802A IL162338A0 (en) | 2001-12-04 | 2002-11-11 | Mobile body communication apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001-370279 | 2001-12-04 | ||
JP2001370279A JP3649179B2 (ja) | 2001-12-04 | 2001-12-04 | 移動体通信装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003049474A1 true WO2003049474A1 (fr) | 2003-06-12 |
Family
ID=19179526
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/011749 WO2003049474A1 (fr) | 2001-12-04 | 2002-11-11 | Appareil de communication a corps mobile |
Country Status (6)
Country | Link |
---|---|
US (1) | US7443921B2 (ja) |
EP (1) | EP1463355B1 (ja) |
JP (1) | JP3649179B2 (ja) |
KR (1) | KR20040064724A (ja) |
IL (1) | IL162338A0 (ja) |
WO (1) | WO2003049474A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0320352D0 (en) * | 2003-09-01 | 2003-10-01 | Secr Defence | Digital modulation waveforms for use in ranging systems |
US20070177492A1 (en) * | 2006-01-27 | 2007-08-02 | Qualcomm Incorporated | Methods and tools for expanding coverage of an ofdm broadcast transmitter via transmit timing advance |
WO2007129621A1 (ja) * | 2006-05-02 | 2007-11-15 | Panasonic Corporation | マルチキャリア通信における無線通信基地局装置および無線通信方法 |
KR101298511B1 (ko) * | 2006-06-14 | 2013-08-22 | 에이저 시스템즈 엘엘시 | 서브심볼 처리를 이용한 직교 주파수 분할 멀티플렉싱 |
US20100189038A1 (en) * | 2009-01-23 | 2010-07-29 | Runhua Chen | Circuit and method for mapping data symbols and reference signals for coordinated multi-point systems |
US8412246B2 (en) * | 2010-04-29 | 2013-04-02 | Eden Rock Communications, Llc | Systems and methods for coordinating the scheduling of beamformed data to reduce interference |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10190612A (ja) * | 1996-12-26 | 1998-07-21 | Sony Corp | 通信方法及び受信装置 |
EP0902551A2 (en) | 1997-09-12 | 1999-03-17 | Lucent Technologies Inc. | Soft handover system for a multiple sub-carrier communication system and method thereof |
EP0913972A2 (en) | 1997-10-31 | 1999-05-06 | Sony Corporation | Multicarrier radio communication system |
EP1148659A1 (en) | 2000-04-18 | 2001-10-24 | Sony International (Europe) GmbH | OFDM diversity transmission |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5031230A (en) * | 1988-10-24 | 1991-07-09 | Simulcomm Partnership | Frequency, phase and modulation control system which is especially useful in simulcast transmission systems |
FI105437B (fi) * | 1998-09-08 | 2000-08-15 | Domiras Oy | Menetelmä langattomassa tietoliikennejärjestelmässä, järjestelmä, lähetin ja vastaanotin |
JP2000134667A (ja) * | 1998-10-29 | 2000-05-12 | Mitsubishi Electric Corp | 移動体通信システム |
JP2001160776A (ja) * | 1999-12-01 | 2001-06-12 | Nec Corp | 送信電力制御周期の設定方法、送信電力制御周期設定装置および送信電力制御周期設定システム |
EP1821480B1 (en) * | 2000-08-24 | 2009-10-21 | Sony Deutschland Gmbh | Communication device for receiving and transmitting OFDM signals in a wireless communication system |
-
2001
- 2001-12-04 JP JP2001370279A patent/JP3649179B2/ja not_active Expired - Fee Related
-
2002
- 2002-11-11 US US10/497,725 patent/US7443921B2/en not_active Expired - Fee Related
- 2002-11-11 IL IL16233802A patent/IL162338A0/xx unknown
- 2002-11-11 KR KR10-2004-7008417A patent/KR20040064724A/ko not_active Application Discontinuation
- 2002-11-11 WO PCT/JP2002/011749 patent/WO2003049474A1/ja active Application Filing
- 2002-11-11 EP EP02788609A patent/EP1463355B1/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10190612A (ja) * | 1996-12-26 | 1998-07-21 | Sony Corp | 通信方法及び受信装置 |
EP0902551A2 (en) | 1997-09-12 | 1999-03-17 | Lucent Technologies Inc. | Soft handover system for a multiple sub-carrier communication system and method thereof |
EP0913972A2 (en) | 1997-10-31 | 1999-05-06 | Sony Corporation | Multicarrier radio communication system |
JPH11136180A (ja) * | 1997-10-31 | 1999-05-21 | Sony Corp | データ通信方法、送信装置及びセルラー無線通信システム |
EP1148659A1 (en) | 2000-04-18 | 2001-10-24 | Sony International (Europe) GmbH | OFDM diversity transmission |
Non-Patent Citations (1)
Title |
---|
See also references of EP1463355A4 |
Also Published As
Publication number | Publication date |
---|---|
IL162338A0 (en) | 2005-11-20 |
JP3649179B2 (ja) | 2005-05-18 |
KR20040064724A (ko) | 2004-07-19 |
EP1463355A1 (en) | 2004-09-29 |
EP1463355B1 (en) | 2012-05-23 |
EP1463355A4 (en) | 2010-04-14 |
US20050100112A1 (en) | 2005-05-12 |
JP2003169382A (ja) | 2003-06-13 |
US7443921B2 (en) | 2008-10-28 |
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