WO2022168218A1 - 通信装置及び通信方法 - Google Patents
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- WO2022168218A1 WO2022168218A1 PCT/JP2021/004050 JP2021004050W WO2022168218A1 WO 2022168218 A1 WO2022168218 A1 WO 2022168218A1 JP 2021004050 W JP2021004050 W JP 2021004050W WO 2022168218 A1 WO2022168218 A1 WO 2022168218A1
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- 238000010586 diagram Methods 0.000 description 12
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
- H04B10/272—Star-type networks or tree-type networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—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
- H04L27/22—Demodulator circuits; Receiver circuits
- H04L27/227—Demodulator circuits; Receiver circuits using coherent demodulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2662—Symbol synchronisation
- H04L27/2665—Fine synchronisation, e.g. by positioning the FFT window
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0044—Control loops for carrier regulation
- H04L2027/0063—Elements of loops
- H04L2027/0067—Phase error detectors
Definitions
- the present invention relates to a communication device and a communication method.
- G-PON standardized by IEEE802.3, ITU-T G.2.
- G-PON standardized as 984 series has been commercialized.
- ONUs optical network units
- ONT optical line terminal
- the upstream signal from each ONU is modulated with On-Off Keying (OOK), which is a binary value of ON/OFF, and transmitted as a burst frame signal in a predetermined time slot.
- OLK On-Off Keying
- Uplink burst frame signals from a plurality of ONUs are multiplexed by time division multiple access (TDMA) and sent to the OLT.
- TDMA time division multiple access
- the OLT receives upstream signals by direct detection.
- a TDMA type PON such as GE-PON and G-PON
- the OLT when an ONU is first connected to the PON, the OLT provides identification information (ONU ID) to the ONU by a function called discovery (or ranging). Also, the distance from the ONU to the OLT is measured. Using this information, dynamic bandwidth allocation (DBA) is performed so that the OLT arrival times of burst frame signals from each ONU do not overlap.
- DBA dynamic bandwidth allocation
- phase/intensity modulation with four or more values can allocate a large number of bits to one symbol, and is therefore excellent in speeding up.
- digital coherent demodulation amplifies the received signal from the power of the local oscillation light, so it is excellent in increasing the number of branches of the optical splitter and extending the length. Therefore, by applying multilevel modulation and digital coherent demodulation, it is possible to achieve both high speed and long extension.
- the burst frame signals of each ONU are generated from laser light sources with different oscillation characteristics.
- Oscillation characteristics differ, for example, due to differences in operating temperature and vibration state, reasons for manufacturing semiconductors of electric/optical devices, and the like. Therefore, there is a problem that different phase noise exists for each ONU in the multilevel phase modulated burst frame signal received by the OLT having one local oscillation light.
- Non-Patent Document 1 Optical Phase-Locked Loop
- OPLL Optical Phase-Locked Loop
- Non-Patent Document 1 uses a special laser light source to suppress phase noise, but it is premised on the addition of high-precision electrical and optical devices. Therefore, there is a problem that the system configuration becomes complicated and realization is difficult.
- One aspect of the present invention is a receiving unit that coherently receives burst frame signals from a plurality of other communication devices, and a block length of a moving average filter in carrier phase synchronization so as to minimize the amount of phase noise in the burst frame signals. and a control unit that changes the .
- An aspect of the present invention includes a receiving step of coherently receiving burst frame signals from a plurality of other communication devices, and a block length of a moving average filter in carrier wave phase synchronization so as to minimize the amount of phase noise of the burst frame signals. and a control step of changing .
- the present invention it is possible to allow different phase noise for each ONU with respect to the multilevel phase modulated burst frame signal while suppressing complication of the system configuration.
- FIG. 1 is a block diagram showing the configuration of a TDMA-PON system 1 according to a first embodiment of the invention
- FIG. It is a block diagram which shows the structure of OLT3 in the 1st Embodiment of this invention.
- 4 is a flow chart showing the operation of the OLT 3 according to the first embodiment of the present invention
- FIG. 4 is a block diagram showing the configuration of an OLT 3a according to the second embodiment of the present invention
- FIG. 9 is a flow chart showing the operation of an OLT 3a according to the second embodiment of the present invention
- FIG. 11 is a block diagram showing the configuration of an OLT 3b according to the third embodiment of the present invention
- FIG. 1 is a block diagram showing the configuration of a TDMA-PON system 1 according to the first embodiment of the invention.
- the TDMA-PON system 1 includes a plurality of multilevel ONUs 2, an OLT 3, a plurality of optical power splitters 4, and an optical fiber 5.
- a plurality of multilevel ONUs 2 and OLT 3 are connected by an optical fiber 5 .
- the optical fiber 5 is split and coupled by the optical power splitter 4 .
- the multilevel phase modulation ONU 2 includes an upstream laser light source 21 , a wavelength locker 22 and a multilevel modulation section 23 .
- Each multilevel phase modulation ONU 2 has an upstream laser light source 21 different from each other.
- the OLT 3 is configured including a local oscillation light source 301 .
- the wavelength locker 22 synchronizes the wavelength of the laser light output from the upstream laser light source 21 with the local oscillation light output from the local oscillation light source 301 of the OLT 3 .
- the multi-level modulation unit 23 multi-level modulates the laser light output from the wavelength locker 22 to generate an upstream burst frame signal.
- OOK modulation which is not affected by phase noise, is used for the preamble of the upstream burst frame signal.
- the OLT 3 uses the local oscillation light source 301 to coherently receive the upstream burst frame signal output from each multilevel phase modulation ONU 2 .
- FIG. 2 is a block diagram showing the configuration of the OLT 3 according to the first embodiment of the invention.
- the OLT 3 in this embodiment measures the amount of phase noise from the preamble of the upstream burst frame signal transmitted from each multilevel phase modulation ONU 2 .
- the OLT 3 variably controls the block length of the moving average filter for carrier phase synchronization of the coherent receiver so as to minimize the amount of phase noise in the upstream burst frame signal.
- the configuration of the TDMA-PON system 1 having the multilevel phase modulation ONU 2 and the OLT 3 will be described, but the system that can provide the present invention is not limited to this configuration. do not have.
- the present invention can be applied to any burst optical communication network having a Point-to-Multipoint configuration or a Multipoint-to-Multipoint configuration, without being limited to the PON system.
- the OLT 3 includes a coherent receiver 30.
- Coherent receiver 30 includes a digital signal processing section 310 .
- the digital signal processor 310 includes a frequency offset compensator 320 for each of the x-polarized waves and the y-polarized waves, a carrier phase synchronizer 330 for each of the x-polarized waves and the y-polarized waves, and a phase noise amount detector 340. Consists of
- the carrier phase synchronization unit 330 is configured including a moving average filter 332 .
- the phase noise amount detection unit 340 includes an amplitude determination unit 341 , an ON data selection unit 342 , a phase difference acquisition unit 343 , a variance value calculation unit 347 and a ⁇ _ ⁇ 2 ⁇ N table 348 .
- the phase noise amount detector 340 measures the amount of phase noise in the preamble section of the time division multiplexed upstream burst frame signal.
- the amplitude determination section 341 of the phase noise amount detection section 340 acquires the time division multiplexed upstream burst frame signal output from the frequency offset compensation section 320 .
- the amplitude determination unit 341 performs amplitude determination using a predetermined threshold value and extracts the preamble of the OOK-modulated upstream burst frame signal. Note that the threshold is set to 10 [dB], for example. Amplitude determination section 341 outputs the extracted preamble to on-data selection section 342 .
- the ON data selection section 342 acquires the preamble output from the amplitude determination section 341 .
- the on-data selection unit 342 selects only on-state data in which optical power exists from the acquired preambles in time series.
- time-series on-state data is represented as r(k).
- the ON data selection unit 342 outputs the selected time-series data to the phase difference acquisition unit 343 .
- the phase difference acquisition unit 343 acquires time-series data output from the on-data selection unit 342 .
- the phase difference acquisition unit 343 continuously performs arithmetic processing defined by the arithmetic expression arg ⁇ r(k)r*(k ⁇ 1) ⁇ on two adjacent data in the acquired time-series data. go to Thereby, the phase noise amount detection section 340 sequentially acquires the phase difference ⁇ (k).
- the phase noise amount detector 340 records the value of the phase difference ⁇ (k) in a storage medium (not shown) such as a memory.
- the variance value calculator 347 refers to the data string of the phase difference ⁇ (k) values recorded in the storage medium, and calculates the variance value ⁇ _ ⁇ 2.
- the variance value ⁇ _ ⁇ 2 is defined as the amount of phase noise (see, for example, the following reference: “Reference: Y. Atzmon, et al., "Laser Phase Noise in Coherent and Differential Optical Transmission Revisited in the Polar Domain", Journal of Lightwave Technology, Vol.27, No.1, pp.19-29, January 1, 2009.”).
- the maximum measurable phase difference in the phase noise amount detector 340 is 2 ⁇ in OOK modulation.
- the moving average filter 332 of the carrier phase synchronization unit 330 eliminates the influence of AWGN (Additive White Gaussian Noise) such as thermal noise.
- AWGN Additional White Gaussian Noise
- the carrier phase synchronization unit 330 compares the calculated variance value ⁇ _ ⁇ 2 with the ⁇ _ ⁇ 2-N table 348 prepared in advance, and acquires the block length N corresponding to the variance value ⁇ _ ⁇ 2. That is, carrier phase synchronization section 330 determines block length N of moving average filter 332 according to the amount of phase noise measured by phase noise amount detection section 340 . Note that the carrier wave phase synchronization unit 330 does not perform variable control of the block length N of the moving average filter 332 in the preamble section of the upstream burst frame signal.
- the carrier wave phase synchronization unit 330 applies the determined block length N of the moving average filter 332 in feedforward to the multilevel phase modulated payload section of the upstream burst frame signal. Note that the same block length N is used for carrier phase synchronization of x-polarization and y-polarization.
- the carrier phase ⁇ (k) is estimated with minimized phase noise for the multilevel phase-modulated payload section, and carrier phase synchronization is performed accurately. This improves reception performance.
- FIG. 3 is a flow chart showing the operation of the OLT 3 according to the first embodiment of the invention.
- the front end unit 300 of the OLT 3 uses the local oscillation light source 301 to coherently receive the upstream burst frame signal output from each multilevel phase modulation ONU 2 (step S001).
- the amplitude determination section 341 of the phase noise amount detection section 340 acquires the time division multiplexed upstream burst frame signal.
- the amplitude determination unit 341 performs amplitude determination using a predetermined threshold value and extracts the preamble of the OOK-modulated upstream burst frame signal (step S002).
- the ON data selection section 342 acquires the preamble output from the amplitude determination section 341 .
- the on-data selection unit 342 selects only on-state data in which optical power is present from the acquired preambles in time series (step S003).
- the phase difference acquisition unit 343 acquires time-series data output from the on-data selection unit 342 .
- the phase difference acquisition unit 343 continuously performs arithmetic processing defined by the arithmetic expression arg ⁇ r(k)r*(k ⁇ 1) ⁇ on two adjacent data in the acquired time-series data. to obtain the phase difference ⁇ (k) (step S004).
- the variance value calculator 347 refers to the data string of the phase difference ⁇ (k) values recorded in the storage medium to calculate the variance value ⁇ _ ⁇ 2 (step S005). As described above, the variance value ⁇ _ ⁇ 2 is defined as the amount of phase noise.
- the carrier wave phase synchronization unit 330 compares the calculated variance value ⁇ _ ⁇ 2 with the ⁇ _ ⁇ 2-N table 348 prepared in advance, so that according to the phase noise amount measured by the phase noise amount detection unit 340 A block length N of the moving average filter 332 is determined (step S006).
- the carrier phase synchronization unit 330 feedforwards the determined block length N of the moving average filter 332 to the multilevel phase modulated payload section of the upstream burst frame signal (step S007).
- the operation of the OLT 3 shown in the flowchart of FIG. 3 is completed.
- the OLT 3 in the first embodiment measures the phase noise amount from the preamble of the upstream burst frame signal transmitted from each multilevel phase modulation ONU 2 .
- the OLT 3 variably controls the block length of the moving average filter for carrier phase synchronization of the coherent receiver so as to minimize the amount of phase noise in the upstream burst frame signal.
- the OLT 3 in this embodiment can use one local oscillation light to allow different phase noise for each ONU with respect to the multilevel phase modulated burst frame signal.
- OOK modulation which is not affected by phase noise, is used for upstream signals transmitted from each multi-level phase modulation ONU 2 .
- FIG. 4 is a block diagram showing the configuration of the OLT 3a according to the second embodiment of the invention.
- the portions that differ from the configuration of the OLT 3 in the first embodiment will be mainly described.
- the OLT 3a in this embodiment measures the amount of phase noise from the upstream burst frame signal during discovery (ranging) operation.
- the OLT 3a controls the block length of the carrier phase synchronization moving average filter for each discovery (ranging) period so as to minimize the phase noise amount of the upstream burst frame signal based on the logical information possessed by the own device. do.
- the logical information here includes information indicating the arrival time of each signal of the upstream burst frame signal used in dynamic bandwidth allocation (DBA).
- the present invention can be applied to any burst optical communication network having a Point-to-Multipoint configuration or a Multipoint-to-Multipoint configuration, without being limited to the PON system.
- the OLT 3a includes a coherent receiver 30a, a dynamic band allocation unit 31, and a PON frame processing unit 33.
- the coherent receiver 30a includes a digital signal processing section 310a.
- the digital signal processor 310a includes a frequency offset compensator 320a for each of the x-polarized wave and the y-polarized wave, a carrier wave phase synchronizer 330a for each of the x-polarized wave and the y-polarized wave, and a phase noise amount detector 340a.
- Consists of The carrier phase synchronization unit 330a is configured including a moving average filter 332a.
- the dynamic bandwidth allocation unit 31 includes a logical information storage unit 32.
- the logical information storage unit 32 stores logical information. As described above, the logical information includes information indicating the arrival time of each upstream burst frame signal used in dynamic bandwidth allocation (DBA).
- DBA dynamic bandwidth allocation
- the PON frame processing section 33 includes a memory 34 and a switching section 35 .
- the memory 34 stores information indicating the block length N that minimizes the phase noise amount of each multilevel phase modulation ONU 2 .
- OOK modulation which is not affected by phase noise, is used for the upstream burst frame signal during discovery (ranging) operation.
- the phase noise amount detection unit 340a performs phase noise amount detection only during discovery (ranging) operation, and measures the phase noise amount from the received upstream burst frame signal.
- the carrier phase synchronization unit 330a does not control the block length N of the moving average filter 332a during the discovery (ranging) period.
- the phase noise amount detection unit 340a detects information indicating the block length N that minimizes the phase noise amount of the multi-level phase modulation ONU 2 from the PON. It is recorded in the memory 34 of the frame processing section 33 .
- the switching unit 35 of the PON frame processing unit 33 refers to the memory 34 and acquires information indicating the block length N. Also, the switching unit 35 refers to the logical information storage unit 32 of the dynamic band allocation unit 31, and stores logical information (that is, information indicating the arrival time of the upstream burst frame signal from each multilevel phase modulation ONU 2). get.
- the switching unit 35 determines the arrival time of the upstream burst frame signal from each multi-level phase modulation ONU 2.
- the block length N of the moving average filter 332a is switched according to time.
- FIG. 5 is a flow chart showing the operation of the OLT 3a according to the second embodiment of the invention.
- the front end unit 300 of the OLT 3a uses the local oscillation light source 301 to coherently receive the upstream burst frame signal output from each multi-level phase modulation ONU 2 during execution of the discovery operation (step S101).
- the on-data selection unit 342 acquires the upstream burst frame signal during execution of the discovery operation.
- the on-data selection unit 342 selects only on-state data in which optical power is present from the acquired upstream burst frame signals in time series (step S102).
- the phase difference acquisition unit 343 acquires time-series data output from the on-data selection unit 342 .
- the phase difference acquisition unit 343 continuously performs an operation represented by the formula arg ⁇ r(k)r*(k ⁇ 1) ⁇ on two adjacent data in the acquired time-series data. , sequentially acquires the phase difference ⁇ (k) (step S103).
- the variance value calculation unit 347 calculates the variance value ⁇ _ ⁇ 2 by referring to the data string of the phase difference ⁇ (k) values recorded on the storage medium. As described above, the variance value ⁇ _ ⁇ 2 is defined as the amount of phase noise.
- the phase noise amount detector 340a records information indicating the block length N that minimizes the phase noise amount of the multilevel phase modulation ONU 2 in the memory 34 of the PON frame processor 33 (step S104).
- the switching unit 35 of the PON frame processing unit 33 refers to the memory 34 and acquires information indicating the block length N (step S105). Also, the switching unit 35 refers to the logical information storage unit 32 of the dynamic band allocation unit 31, and stores logical information (that is, information indicating the arrival time of the upstream burst frame signal from each multilevel phase modulation ONU 2). Acquire (step S106).
- the switching unit 35 determines the arrival time of the upstream burst frame signal from each multi-level phase modulation ONU 2.
- the block length N of the moving average filter 332a is switched according to time (step S107).
- the OLT 3a in the second embodiment updates (switches) the block length N of the moving average filter 332a for each discovery (ranging) cycle, based on the logical information it owns.
- the OLT 3a in this embodiment performs the calculation necessary for measuring the amount of phase noise for each upstream burst frame signal and accessing the table in the OLT 3 in the first embodiment. Processing can be reduced.
- a third embodiment of the present invention will be described below.
- the block diagram showing the configuration of the TDMA-PON system in this embodiment is the same as the block diagram showing the configuration of the TDMA-PON system 1 in the first embodiment shown in FIG. 1, so description thereof will be omitted.
- functional units that are the same as the functional units of the TDMA-PON system 1 in the first embodiment are given the same reference numerals.
- FIG. 6 is a block diagram showing the configuration of OLT 3b according to the third embodiment of the present invention.
- the portions that differ from the configuration of the OLT 3 in the first embodiment and the configuration of the OLT 3a in the second embodiment will be mainly described.
- the present invention can be applied to any burst optical communication network having a Point-to-Multipoint configuration or a Multipoint-to-Multipoint configuration, without being limited to the PON system.
- the OLT 3b includes a coherent receiver 30b, a dynamic band allocation unit 31b, and a PON frame processing unit 33b.
- the coherent receiver 30b includes a digital signal processing section 310b.
- the digital signal processor 310b includes a frequency offset compensator 320b for each of the x-polarized waves and the y-polarized waves, a carrier wave phase synchronizer 330b for each of the x-polarized waves and the y-polarized waves, and a phase noise amount detector 340b. , a phase noise compensator 350b and a switch 360b.
- the carrier phase synchronization unit 330b is configured including a moving average filter 332b.
- the dynamic bandwidth allocation unit 31b includes a logical information storage unit 32.
- the logical information storage unit 32 stores logical information. As described above, the logical information includes information indicating the arrival time of each upstream burst frame signal used in dynamic bandwidth allocation (DBA).
- DBA dynamic bandwidth allocation
- the PON frame processing unit 33b is configured including an algorithm switching unit 36.
- OLT 3b in the present embodiment detects the amount of phase noise by means of phase noise amount detection section 340b. If the performance cannot be improved, we switch to using polarization pilots to compensate for phase noise.
- the OLT 3b corrects the phase noise by the phase noise compensator 350b for the upstream burst frame signal from each multi-level phase modulation ONU 2. Received signal processing is performed using the compensating means. Phase noise compensator 350b compensates for phase noise using the polarization pilot.
- the OLT 3b performs received signal processing on the upstream burst frame signal from each multi-level phase modulation ONU 2 using the carrier wave phase synchronization means of the carrier wave phase synchronization unit 330b. I do.
- the algorithm switching unit 36 of the PON frame processing unit 33b switches the switch 360b as necessary to Control is performed so that reception processing is performed by the noise compensator 350b.
- the algorithm switching unit 36 switches the switch 360b as necessary, whereby the carrier phase synchronization unit 330b performs reception processing. control so that
- the OLT 3b uses one polarized wave as a pilot, so the transmission speed is half that when the carrier phase synchronization means is used.
- the block length of the moving average filter for carrier phase synchronization in the OLT is variably controlled. can allow different phase noise for each ONU.
- the communication device includes the receiving unit and the control unit.
- the receiving section is the front end section 300 in the embodiment
- the control section is the digital signal processing sections 310, 310a, and 310b in the embodiment.
- the receiver receives burst frame signals from a plurality of other communication devices.
- another communication device is the multilevel phase modulation ONU 2 in the embodiment.
- the controller changes the block length of the moving average filter in carrier phase synchronization so as to minimize the amount of phase noise in the burst frame signal.
- the communication device may further include a measurement unit.
- the measurement unit is the phase noise amount detection unit 340 in the embodiment.
- the measurement unit measures the amount of phase noise from the preamble of the burst frame signal.
- the controller changes the block length for each burst frame signal.
- the preamble of the burst frame signal may be a signal subjected to on-off keying modulation.
- the communication device may further include a measurement unit.
- the measurement unit is the phase noise amount detection unit 340a in the embodiment.
- the measurement unit measures the amount of phase noise from the burst frame signal during execution of the discovery operation.
- the control unit changes the block length for each execution cycle of the discovery operation.
- control unit may change the block length based on information indicating the arrival time of each burst frame signal used in dynamic band allocation.
- burst frame signal during execution of the discovery operation may be a signal subjected to on-off keying modulation.
- the communication device may further include a compensator.
- the compensator is the phase noise compensator 350b in the embodiment.
- a compensator compensates for phase noise using the polarization pilot. In this case, when the amount of phase noise is equal to or greater than a predetermined value, the controller does not perform carrier phase synchronization and causes the compensator to compensate for the phase noise.
- a part or all of the OLT 3, OLT 3a, or OLT 3b in each of the above-described embodiments may be realized by a computer.
- a program for realizing this function may be recorded in a computer-readable recording medium, and the program recorded in this recording medium may be read into a computer system and executed.
- the "computer system” referred to here includes hardware such as an OS and peripheral devices.
- the term "computer-readable recording medium” refers to portable media such as flexible discs, magneto-optical discs, ROMs and CD-ROMs, and storage devices such as hard discs incorporated in computer systems.
- “computer-readable recording medium” means a medium that dynamically retains a program for a short period of time, like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. It may also include something that holds the program for a certain period of time, such as a volatile memory inside a computer system that serves as a server or client in that case. Further, the program may be for realizing a part of the functions described above, or may be capable of realizing the functions described above in combination with a program already recorded in the computer system. It may be implemented using a programmable logic device such as an FPGA (Field Programmable Gate Array).
- FPGA Field Programmable Gate Array
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Abstract
Description
以下、本発明の第1の実施形態について説明する。
以下、多値変調・コヒーレント受信が適用されたTDMA-PONシステム1の構成について説明する。図1は、本発明の第1の実施形態におけるTDMA-PONシステム1の構成を示すブロック図である。
以下、OLT3の構成について説明する。図2は本発明の第1の実施形態におけるOLT3の構成を示すブロック図である。
以下、OLT3の動作の一例について説明する。図3は、本発明の第1の実施形態におけるOLT3の動作を示すフローチャートである。
以下、本発明の第2の実施形態について説明する。なお、本実施形態におけるTDMA-PONシステムの構成を示すブロック図は、図1に示される第1の実施形態におけるTDMA-PONシステム1の構成を示すブロック図と同様であるため、説明を省略する。また、以下の説明においては、第1の実施形態におけるTDMA-PONシステム1の機能部と同一の機能部に対しては、同一の符号を付して説明する。
以下、OLT3aの構成について説明する。図4は本発明の第2の実施形態におけるOLT3aの構成を示すブロック図である。なお、以下では、OLT3aの構成のうち、前述の第1の実施形態におけるOLT3の構成と異なる部分を中心に説明する。
以下、OLT3aの動作の一例について説明する。図5は、本発明の第2の実施形態におけるOLT3aの動作を示すフローチャートである。
以下、本発明の第3の実施形態について説明する。なお、本実施形態におけるTDMA-PONシステムの構成を示すブロック図は、図1に示される第1の実施形態におけるTDMA-PONシステム1の構成を示すブロック図と同様であるため、説明を省略する。また、以下の説明においては、第1の実施形態におけるTDMA-PONシステム1の機能部と同一の機能部に対しては、同一の符号を付して説明する。
以下、OLT3bの構成について説明する。図6は本発明の第3の実施形態におけるOLT3bの構成を示すブロック図である。なお、以下では、OLT3bの構成のうち、前述の第1の実施形態におけるOLT3及び第2の実施形態におけるOLT3aの構成と異なる部分を中心に説明する。
Claims (8)
- 複数の他の通信装置からバーストフレーム信号をそれぞれ受信する受信部と、
前記バーストフレーム信号の位相雑音量を最小化させるように搬送波位相同期における移動平均フィルタのブロック長を変化させる制御部と、
を備える通信装置。 - 前記バーストフレーム信号のプリアンブルから前記位相雑音量を測定する測定部
をさらに備え、
前記制御部は、前記バーストフレーム信号ごとに前記ブロック長を変化させる
請求項1に記載の通信装置。 - 前記バーストフレーム信号の前記プリアンブルは、オンオフキーイング変調がなされた信号である
請求項2に記載の通信装置。 - ディスカバリ動作の実行時のバーストフレーム信号から前記位相雑音量を測定する測定部
をさらに備え、
前記制御部は、前記ディスカバリ動作の実行周期ごとに前記ブロック長を変化させる
請求項1に記載の通信装置。 - 前記制御部は、動的帯域割当において用いられる各バーストフレーム信号の到着時間を示す情報に基づいて前記ブロック長を変化させる
請求項4に記載の通信装置。 - 前記ディスカバリ動作の実行時のバーストフレーム信号は、オンオフキーイング変調がなされた信号である
請求項4又は請求項5に記載の通信装置。 - 偏波パイロットを用いて位相雑音を補償する補償部
をさらに備え、
前記制御部は、前記位相雑音量が所定値以上である場合、前記搬送波位相同期を行わず、前記補償部に前記位相雑音を補償させる
請求項1から6のうちいずれか一項に記載の通信装置。 - 複数の他の通信装置からバーストフレーム信号をそれぞれ受信する受信ステップと、
前記バーストフレーム信号の位相雑音量を最小化させるように搬送波位相同期における移動平均フィルタのブロック長を変化させる制御ステップと、
を有する通信方法。
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