WO2016194298A1 - 集約物理層プロトコルデータユニットの伝送装置および伝送方法 - Google Patents
集約物理層プロトコルデータユニットの伝送装置および伝送方法 Download PDFInfo
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- H—ELECTRICITY
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- 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
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- H—ELECTRICITY
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- 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
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
- H04L1/005—Iterative decoding, including iteration between signal detection and decoding operation
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- H—ELECTRICITY
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- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
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- H04L1/0041—Arrangements at the transmitter end
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- H04L1/0045—Arrangements at the receiver end
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L1/0056—Systems characterized by the type of code used
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- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0086—Unequal error protection
- H04L1/0088—Unequal error protection in control part
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- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
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- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
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- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
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- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
- H04L27/2692—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
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- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
- H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
- H04L69/323—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the physical layer [OSI layer 1]
Definitions
- the present disclosure relates generally to wireless communication, and more specifically to a method of formatting and transmitting aggregated PPDUs (Physical Layer Protocol Data Units (physical layer protocol data units)) in a wireless communication system.
- PPDUs Physical Layer Protocol Data Units (physical layer protocol data units)
- Wireless HD Hi-Definition
- WiGig WiGig technology
- WiGig technology complements and extends the IEEE 802.11 MAC (Media Access Control) layer and is backward compatible with the IEEE 802.11 WLAN standard.
- WiGig MAC supports a centralized network architecture such as infrastructure BSS (Basic Service Set (Basic Service Set)) or PBSS (Personal BSS (Personal BSS)), in which, for example, AP (Access Point) ) Or a central coordinator such as PCP (Personal BSS Control Point (Personal BSS Control Point)) transmits a beacon for synchronizing all STAs (Stations) in the network.
- AP Access Point
- PCP Personal BSS Control Point
- WiGig technology makes full use of BF (Beamforming) to perform directional transmission.
- BF Beamforming
- WiGig technology can provide PHY (Physical Layer) data transfer rates up to 6.7 Gbps.
- WiGigPHY supports both SC (Single Carrier) modulation and OFDM (Orthogonal Frequency Division Multiplexing) modulation.
- SC modulation an aggregate PPDU is a sequence of two or more SC PPDUs that are transmitted without IFS (Inter-frame Spacing), preamble, and demultiplexer during PPDU transmission. is there.
- WiGig technology uses a wireless USB (Universal Serial Bus) for instant synchronization between a smartphone or tablet or a wireless HDMI (registered trademark) (High Definition Multimedia Interface) for video streaming. Universal serial bus)) can be used to implement links.
- State-of-the-art wired digital interfaces eg USB 3.5 and HDMI® 1.3
- NG60 Next Generation 60 GHz (next generation 60 GHz)
- WiGig while maintaining backward compatibility with existing (ie legacy) WiGig devices to achieve PHY data transfer rates up to tens of Gbps.
- MIMO Multiple Input Multiple Output
- NG60WiGig uses standard bandwidth, LF (Legacy Format (legacy format)) PPDU defined in IEEE802.11ad, and MIMO transmission using variable bandwidth. It must be able to support both MF (Mixed Format) PPDUs with the ability to reserve.
- MF ixed Format
- the techniques disclosed herein include an aggregate physical layer protocol data unit that includes a legacy preamble, a legacy header, a non-legacy preamble, a plurality of non-legacy headers, and a plurality of data fields.
- a transmission signal generator that generates a transmission signal having (aggregated PPDU), and a transmitter that transmits the generated transmission signal, wherein the legacy preamble, the legacy header, and the plurality of non-legacy headers have a standard bandwidth While the non-legacy preamble and the plurality of data fields are transmitted using a variable bandwidth greater than or equal to the standard bandwidth, and the plurality of sets of non-legacy headers and corresponding data fields are timed.
- the transmitter is transmitted sequentially in the area.
- the transmission efficiency is maximized.
- FIG. 1 is a diagram illustrating an exemplary SC PPDU format according to the prior art.
- FIG. 2 is a diagram illustrating exemplary header fields according to the prior art.
- FIG. 3 is a block diagram illustrating an exemplary transmitter for header and data fields according to the prior art.
- FIG. 4 is a diagram illustrating an exemplary aggregated SC PPDU format according to the prior art.
- FIG. 5 is a diagram illustrating an exemplary MF SC PPDU format in accordance with the present disclosure.
- FIG. 6 is a diagram illustrating exemplary NG60 header content in accordance with the present disclosure.
- FIG. 7 is a block diagram illustrating an exemplary Tx baseband processor for the NG60 header and data field of an MF SC PPDU according to this disclosure.
- FIG. 8 is a diagram illustrating exemplary MF SC PPDU transmission in a channel with a channel bandwidth twice the standard bandwidth according to the present disclosure.
- FIG. 9 is a block diagram illustrating an exemplary Rx baseband processing device for receiving MF SC PPDUs according to this disclosure.
- FIG. 10A is a diagram illustrating an example of a format of the aggregated MF SC PPDU according to the first embodiment of the present disclosure.
- FIG. 10B is a diagram illustrating another example of the format of the aggregated MF SC PPDU according to the first embodiment of the present disclosure.
- FIG. 11 is a diagram illustrating an exemplary aggregated MF SC PPDU transmission in a channel with a channel bandwidth that is twice the standard bandwidth according to the first embodiment of the present disclosure.
- FIG. 10A is a diagram illustrating an example of a format of the aggregated MF SC PPDU according to the first embodiment of the present disclosure.
- FIG. 10B is a diagram illustrating another example of the format of the aggregated
- FIG. 12 is a diagram illustrating an exemplary aggregated MF SC PPDU format according to the second embodiment of the present disclosure.
- FIG. 13 is a diagram illustrating exemplary aggregated MF SC PPDU transmission in a channel whose channel bandwidth is twice the standard bandwidth according to the second embodiment of the present disclosure.
- FIG. 14 is a diagram illustrating an exemplary aggregated MF SC PPDU format according to the third embodiment of the present disclosure.
- FIG. 15 is a block diagram illustrating an example architecture of a wireless communication device in accordance with the present disclosure.
- FIG. 16 is a diagram illustrating an exemplary aggregated MF SC PPDU format in which a plurality of configuration-aggregated MF SC PPDUs are further aggregated according to the first embodiment of the present disclosure.
- FIG. 17 illustrates exemplary aggregated MF SC PPDU transmission in which a plurality of configuration aggregated MF SC PPDUs are further aggregated in a channel whose channel bandwidth is twice the standard bandwidth according to the first embodiment of the present
- FIG. 1 shows an exemplary SC PPDU 100 format according to the prior art.
- the SC PPDU 100 includes an STF (Short Training Field (short training field)) 101, a CEF (Channel Estimation Field (channel estimation field)) 103, a header 112, a data field 114, an optional AGC & TRN-R / T subfield 115. Including. All fields of SC PPDU 100 are transmitted using a standard bandwidth of 2.16 GHz.
- the STF 101 is used for packet detection, AGC (Automatic Gain Control (automatic gain control)), frequency offset estimation and synchronization.
- the CEF 103 is used for channel estimation, and SC modulation and OFDM modulation CEF indicators are used for the SC PPDU 100.
- the header 112 includes a plurality of fields that define details of the SC PPDU 100 to be transmitted.
- the data field 114 includes SC PPDU 100 payload data.
- the number of data octets in the data field 114 is specified by the length field of the header 112, and the MCS (Modulation and Coding Scheme) used by the data field 114 is specified by the MCS field of the header 112.
- the MCS Modulation and Coding Scheme
- the AGC & TRN-R / T subfield 115 exists only when the SC PPDU 100 is used for beam adjustment or tracking.
- the length of the AGC & TRN-R / T subfield 115 is specified by the training length field of the header 112. Whether the TRN-R field or the TRN-T field exists is specified by the packet type field of the header 112.
- FIG. 3 is a block diagram illustrating an exemplary transmitter 300 for header 112 and data field 114 in accordance with the prior art.
- the transmitter 300 includes a scrambler 302, an LDPC (Low Density Parity Check) encoder 304, a modulator 306, and a symbol blocking and guard insertion block 308.
- Scrambler 302 scrambles the bits of header 112 and data field 114. Note that the shift register included in the scrambler 302 is initialized according to the scrambler initialization field of the header 112.
- the header 112 is scrambled starting from the bits of the MCS field following the scrambler initialization field.
- the LDPC encoder 304 performs LDPC encoding on the scrambled bits of the header 112 at a predetermined code rate, and generates a sequence of encoded bits.
- the modulator 306 converts the code bit sequence into a plurality of complex constellation points using ⁇ / 2-BPSK (Binary Phase Shift Keying).
- Symbol blocking and guard insertion block 308 generates two SC blocks from multiple complex constellation points.
- Each SC block (eg, 132) includes 448 ⁇ / 2-BPSK data symbols, and a guard interval 131 of 64 ⁇ / 2-BPSK symbols generated from a predefined length 64 Golay sequence. Is prepended.
- the LDPC encoder 304 performs LDPC encoding of the scrambled bits of the data field 114 at the code rate specified by the MCS field of the header 112.
- the LDPC encoder 304 embeds bits as necessary, and then generates a sequence of encoded bits.
- Modulator 306 converts the encoded and filled bitstream into a stream of complex constellation points according to the modulation scheme specified in the MCS field of header 112.
- the symbol blocking and guard insertion block 308 generates a plurality of SC blocks from the stream of complex constellation points.
- Each SC block (eg 142) includes 448 data symbols and is prepended with the same guard interval 131.
- the last SC block 144 to be transmitted must be followed by the same guard interval 131 to facilitate SC FDE (Frequency Domain Equalization).
- SC FDE Frequency Domain Equalization
- FIG. 4 shows an exemplary aggregated SC PPDU format according to the prior art.
- Aggregated SC PPDU 400 includes four constituent SC PPDUs. Each of the four SC PPDUs in the aggregate SC PPDU 400 consists of a header and a data field.
- the SC PPDU 410 includes a header 412 and a data field 414.
- the SC PPDU 410 arranged at the start of the aggregated SC PPDU 400 further includes STF 401 and CEF 403.
- the SC PPDU 440 arranged at the end of the aggregated SC PPDU 400 further includes an optional AGC & TRN-R / T subfield 445. Note that there is no IFS, preamble, and demultiplexer between PPDU transmissions in aggregated SC PPDU 400.
- STF 401 and CEF 403 in aggregated SC PPDU 400, each header (eg 412), each data field (eg 414), and AGC & TRN-T / R subfield 445 are included in SC PPDU 100 of FIG. These are defined in exactly the same way as their respective counterparts (counterparts).
- the last SC block transmitted as a data field is followed by the first SC block transmitted as a header. Accordingly, it is necessary to post-pend the same guard interval 131 only to the last SC block 452 in the last SC PPDU 440.
- FIG. 5 shows an example format of the MF SC PPDU 500 according to the present disclosure.
- the MF SC PPDU 500 includes a legacy STF 501, a legacy CEF 503, a legacy header 505, an NG60 header 512, an NG60STF507, a plurality of NG60CEF509s, a data field 514, and an optional AGC & TRN-R / T subfield 515.
- the legacy STF 501, the legacy CEF 503, and the legacy header 505 are defined in exactly the same manner as their corresponding functions in FIG.
- the NG60 header 512 defines details of the MF SC PPDU 500 to be transmitted. Exemplary fields of the NG60 header 512 are shown in FIG.
- the data field 514 includes payload data of the MF SC PPDU 500.
- the data field 514 can be applied with STBC (Space-Time Block Coding) or MIMO spatial multiplexing, whereby multiple STSs (Space-Time Stream) in the data field 514 can be applied. A spatial stream)).
- the number of STSs in the data field 514 is specified in the N sts field of the NG60 header 512.
- NG60STF507 is used only for AGC retraining.
- Multiple NG60CEF509s are used for channel estimation for multiple STSs in data field 514.
- the number of NG60CEFs 509 is determined by the number of STSs in the data field 514. In one embodiment, the number of NG60CEF509s should not be less than the number of STSs in the data field 514. For example, if the number of STSs in the data field 514 is 2, the number of NG60CEF509s can be set to 2. If the number of STSs in the data field 514 is 3, the number of NG60CEFs 509 can be set to 4.
- FIG. 7 is a block diagram illustrating an exemplary Tx baseband processing device 700 for the NG 60 header 512 and data field 514 of the MF SC PPDU 500.
- Tx baseband processing apparatus 700 includes scrambler 702, LDPC encoder 704, modulator 706, MIMO encoder 708, and symbol blocking and guard insertion block 710.
- the modulator 706 includes a first modulation functional block 712, a second modulation functional block 714, and a third modulation functional block 716.
- the bits of the NG60 header 512 are prepended to the bits of the data field 514 and sent to the scrambler 702.
- the scrambler 702 scrambles the bits of the NG60 header 512 and the data field 514 in accordance with a predefined scrambling rule.
- the shift register included in scrambler 702 is initialized according to the scrambler initialization field in NG60 header 512.
- the NG60 header 512 is scrambled starting from the bits of the MCS field following the scrambler initialization field, and the scrambling of the data field 514 is performed without reset following the scrambling of the NG60 header 512.
- the LDPC encoder 704 performs LDPC encoding on the scrambled bits of the NG60 header 512 at a predetermined code rate, and generates a sequence of encoded bits.
- a second modulation function block 714 within modulator 706 converts the sequence of coded bits into a stream of complex constellation points using ⁇ / 2-BPSK with 90 degree phase rotation.
- a symbol blocking and guard insertion block 710 generates two SC blocks from this stream of complex constellation points. Each SC block includes 448 data symbols and is prepended with the same guard interval 131. Furthermore, the last SC block 532 in the NG60 header 512 needs to be followed by the same guard interval 131.
- the LDPC encoder 704 performs LDPC encoding of the scrambled bits of the data field 514 with the code rate specified by the MCS field of the NG60 header 512, padding bits as necessary. After that, a sequence of coded bits is generated.
- a third modulation function block 716 within the modulator 706 converts the encoded and filled bitstream into a stream of complex constellation points according to the modulation scheme specified by the MCS field of the NG60 header 512. Note that the first modulation functional block 712 inside the modulator 706 is used for modulation of the legacy header 505.
- the MIMO encoder 708 applies MIMO encoding to the stream of complex constellation points to obtain a plurality of STS 550s. For each STS, symbol blocking and guard insertion block 710 generates multiple SC blocks. The number of SC blocks per STS is the same.
- Each SC block (eg, 542) includes N 1 data symbols and prepends a guard interval 541 of N 2 ⁇ / 2-BPSK symbols generated from a predefined length N 2 Golay sequence.
- N 1 and N 2 should be positive integers and N 1 should be an integer multiple of N 2 .
- the values of N 1 and N 2 are configurable and can be shown in the NG60 header 512. Furthermore, for each STS, the last SC block to be transmitted must be followed by the same guard interval 541.
- the legacy header 505 of the MF SC PPDU 500 has exactly the same format and Tx processing as the header 112 of the SC PPDU 100, so the legacy WiGig device can correctly decode the legacy header 505 of the MF SC PPDU 500. .
- the NG60 header 512 of the MF SC PPDU 500 is modulated using ⁇ / 2-BPSK having a phase rotation of 90 degrees different from the phase rotation of the legacy header 505. With such a modulation difference, the NG60 device can determine whether the received SC PPDU is MF or LF.
- legacy WiGig devices will be able to process received MF SC PPDU 500 in the same manner as SC PPDU 100.
- a legacy WiGig device could see the NG60 header 512, NG60STF507, and NG60CEF509 as part of PSDU (PHY Service Data Unit (PHY Service Data Unit)).
- PSDU PHY Service Data Unit
- the values of the MCS field and the length field of the legacy header 505 must be set appropriately.
- the NG60 device can know the channel bandwidth information only after the device has successfully decoded the NG60 header 512.
- NG60STF507, multiple NG60CEF509, data field 514, and optional AGC & TRN-R / T subfield 515 can be transmitted using variable bandwidth.
- the legacy STF 501, the legacy CEF 503, the legacy header 505, and the NG60 header 512 can be transmitted using only the standard bandwidth. Apply M frequency copies of Legacy STF501, Legacy CEF503, Legacy Header 505, and NG60 Header 512 to each of these M copies in a channel with a channel bandwidth M times the standard bandwidth After that, it can transmit simultaneously in this channel using standard bandwidth.
- the frequency offset for the original legacy STF, legacy CEF, legacy header, and NG60 header can be set to 50% of the standard bandwidth, and the replicated legacy STF, legacy CEF, The frequency offset for the legacy header and the NG60 header can be set to -50% of the standard bandwidth.
- FIG. 9 is a block diagram illustrating an exemplary Rx baseband processing device 900 for receiving the MF SC PPDU 500 according to this disclosure.
- the Rx baseband processing apparatus 900 includes a symbol deblocking and guard removal block 902, a MIMO decoder 904, a demodulator 906, an LDPC decoder 908, a descrambler 910, and a channel estimator 912.
- the MIMO decoder 904 can be applied only to the decoding of the data field 514.
- the symbol blocking release and guard removal block 902 performs the reverse operation on the symbol blocking and guard insertion block 710 in the received MF SC PPDU 500.
- NG60 header 512 needs to be decrypted first.
- demodulator 906 performs an inverse operation on modulator 706 based on the channel estimate obtained by channel estimator 912 from legacy CEF 503. More specifically, the second demodulation function block 916 is applied to a portion corresponding to the NG60 header 512.
- LDPC decoder 908 and descrambler 910 perform inverse operations on LDPC encoder 704 and scrambler 702, respectively, to obtain the decoded bits of legacy header 505 and NG60 header 512.
- the Rx baseband processing apparatus 900 proceeds to decode the data field 514 based on the information in the NG60 header 512.
- the MIMO decoder 904 performs an inverse operation on the MIMO encoder 708 on the portion corresponding to the data field 514 of the received MF SC PPDU 500 based on the channel estimation obtained by the channel estimator 912 from the NG60CEF 509. .
- Demodulator 906 performs the inverse operation on modulator 706. More specifically, the third demodulation function block 918 is applied to a portion corresponding to the data field 514. Note that the first demodulation function block 914 within the demodulator 906 is used for demodulation of the received legacy header 505.
- LDPC decoder 908 and descrambler 910 perform inverse operations on LDPC encoder 704 and scrambler 702, respectively, to obtain decoded bits of data field 514.
- FIG. 10A and 10B show an example format of the aggregated MF SC PPDU 1000 according to the first embodiment of the present disclosure.
- This aggregated MF SC PPDU 1000 includes four MF SC PPDUs.
- Each of the four MF SC PPDUs includes an NG60 header and a data field.
- the first MF SC PPDU 1010 includes an NG60 header 1012 and a data field 1014.
- the first MF SC PPDU 1010 arranged at the start of the aggregated MF SC PPDU 1000 further includes a legacy STF 1001, a legacy CEF 1003, a legacy header 1005, an NG60STF 1007, and a plurality of NG60CEF 1009s.
- the second MF SC PPDU 1020 placed next to the first MF SC PPDU 1010 includes an NG60 header 1022 and a data field 1024.
- the last MF SC PPDU 1040 located at the end of the aggregate MF SC PPDU 1000 further includes an optional AGC & TRN-R / T subfield 1045. Note that there is no IFS, preamble, and separator between MF SC PPDU transmissions in the aggregate MF SC PPDU 1000. Therefore, the transmission efficiency is improved as compared with individual transmission of the normal MF SC PPDU 500.
- all of the data fields in the aggregated MF SC PPDU 1000 have the same transmission bandwidth.
- the number of STSs N sts for data fields in the aggregated MF SC PPDU 1000 may be different.
- each of data field 1014 and data field 1044 has two STSs
- data field 1024 has one STS
- data field 1034 has three STSs.
- the number of NG60CEFs 1009 depends on the maximum number of STSs between all data fields in the aggregated MF SC PPDU 1000. For example, if the maximum number of STSs between all data fields is 2, the number of NG60CEF1009s can be set to 2.
- the number of NG60CEF1009s can be set to 4.
- the number of STSs N sts for data fields in aggregated MF SC PPDU 1000 may be the same. For example, as shown in FIG. 10B, each of the data fields has two STSs.
- NG60STF1007, multiple NG60CEF1009, each of the data fields (eg, 1014), and any AGC & TRN-R / T subfield 1045 can be transmitted using variable bandwidth.
- each of the legacy STF 1001, the legacy CEF 1003, the legacy header 1005, and the NG60 header (for example, 1012) can be transmitted using only the standard bandwidth.
- FIG. 11 is a diagram illustrating transmission of aggregated MF SC PPDU 1000 in a channel whose channel bandwidth is twice the standard bandwidth. As shown in FIG. 11, the original legacy STF, the original legacy CEF, the original legacy header, and the original all NG60 header are each duplicated in the frequency domain.
- the frequency offset for the original legacy STF, the original legacy CEF, the original legacy header and the original all NG60 header can be set to 50% of the standard bandwidth.
- the frequency offset for the replicated legacy STF, replicated legacy CEF, replicated legacy header, and all replicated NG60 headers can be set to -50% of the standard bandwidth.
- each SC block includes the same number of data symbols and is prepended with the same guard interval 1051.
- the NG60 header since the NG60 header may have a transmission bandwidth different from the transmission bandwidth of the data field that follows, the final NG60 header transmitted in the aggregate MF SC PPDU 1000
- the SC blocks need to be followed by the same guard interval 131.
- the required number of guard intervals added subsequently to the NG60 header is 4.
- the final SC block For every STS in which every data field in aggregated MF SC PPDU 1000 is transmitted, the final SC block needs to be followed by the same guard interval 1051. As a result, the number of subsequent guard intervals required for the data field is 8.
- the Tx baseband processing device 700 for transmitting the MF SC PPDU 500 can be easily adapted to transmit the aggregated MF SC PPDU 1000.
- the Rx baseband processing device 900 for receiving the MF SC PPDU 500 can be easily adapted to receive the aggregated MF SC PPDU 1000.
- the channel estimates obtained by the channel estimator 912 from the legacy CEF 1003 can be used to decode all of the NG60 headers 1012, 1022, 1032, and 1042 in the received aggregated MF SC PPDU 1000.
- the channel estimate obtained by the channel estimator 912 from the NG60CEF 1009 can be used to decode all of the data fields 1014, 1024, 1034, and 1044 in the received aggregated MF SC PPDU 1000.
- the transmission and reception of the aggregated MF SC PPDU 1000 does not incur extra mounting complexity.
- the legacy STA (station) can decode the legacy header 1005, but cannot decode the remaining part of the aggregated MF SC PPDU 1000.
- the additional PPDU field in the legacy header 1016 can be set to zero.
- the aggregated MF SC PPDU 1000 must be seen by the legacy STA as a normal legacy PPDU 100 instead of the legacy aggregated SC PPDU 400.
- the equivalent data field includes NG60STF1007, NG60CEF1009, all NG60 headers, and all data fields in the aggregated MF SC PPDU 1000.
- the total packet length of all of the NG60STF 1007, NG60CEF1009, NG60 header, and all of the data fields is set as the length field in the legacy header 1005.
- the legacy STA can calculate the actual transmission time of the equivalent data field of the aggregated MF SC PPDU 1000 by decoding the legacy header 1005. Therefore, if the clock frequency error between the central coordinator such as AP (Access Point (access point)) or PCP (Personal BSS Control Point (personal BSS control point)) and the legacy STA is extremely small, it is added in the legacy header 1005.
- the PPDU field can be set to 1.
- the second configuration aggregation MF SC PPDU 1620 includes a third MF SC PPDU 1620-1 arranged in the start part and a fourth MF SC PPDU 1620-2 arranged in the terminal part.
- Each of the MF SC PPDUs 1610-1, 1610-2, 1620-1, 1620-2 includes an NG60 header and a data field.
- the first MF SC PPDU 1610-1 includes an NG60 header 1612 and a data field 1614.
- the first MF SC PPDU 1610-1 further includes a legacy STF 1601, a legacy CEF 1603, a legacy header 1605, NG60STF 1607, and a plurality of NG60CEF 1609s.
- the third MF SC PPDU 1620-1 further includes a legacy header 1635, NG60STF1637, and a plurality of NG60CEF1639s.
- Fourth MF SC PPDU 1620-2 further includes an optional AGC & TRN-R / T subfield 1645. It should be noted that there is no IFS, preamble, and demultiplexing unit between configuration aggregated MF SC PPDU transmissions in aggregated MF SC PPDU 1600.
- FIG. 17 is a diagram showing transmission of aggregated MF SC PPDU 1600 in a channel whose channel bandwidth is twice the standard bandwidth.
- the original legacy STF, the original legacy CEF, the original legacy header, and the original NG60 header are each duplicated in the frequency domain.
- the frequency offset for the original legacy STF, the original legacy CEF, the original legacy header and the original all NG60 header can be set to 50% of the standard bandwidth.
- the frequency offset for the replicated legacy STF, replicated legacy CEF, replicated legacy header, and all replicated NG60 headers can be set to -50% of the standard bandwidth.
- FIG. 12 shows another example format of an aggregate MF SC PPUD 1200 according to the second embodiment of the present disclosure.
- Aggregated MF SC PPDU 1200 includes four MF SC PPDUs 1210, 1220, 1230, and 1240. Each of the four MF SC PPDUs includes an NG60 header and a data field.
- the MF SC PPDU 1210 includes an NG60 header 1212 and a data field 1214.
- the first MF SC PPDU 1210 arranged at the start of the aggregated MF SC PPDU 1200 further includes a legacy STF 1201, a legacy CEF 1203, a legacy header 1205, NG60STF 1207, and a plurality of NG60CEF 1209.
- the last MF SC PPDU 1240 located at the end of the aggregate MF SC PPDU 1200 further includes an optional AGC & TRN-R / T subfield 1245. Note that there is no IFS, preamble, and separator between MF SC PPDU transmissions in the aggregate MF SC PPDU 1200. Therefore, the transmission efficiency is improved as compared with individual transmission of the normal MF SC PPDU 500.
- all of the data fields in the aggregated MF SC PPDU 1200 have the same number of STSs in addition to the same transmission bandwidth. For example, as shown in FIG. 12, every data field in aggregated MF SC PPDU 1200 has two STSs.
- each SC block includes the same number of data symbols and is prepended with the same guard interval 1251.
- all of the NG60 headers are collectively arranged immediately before the NG60STF 1207.
- the last SC block transmitted as the last NG60 header 1242 in the aggregated MF SC PPDU 1200 needs to be followed by the same guard interval 131.
- the required number of guard intervals added subsequently to the NG60 header is 1.
- all of the data fields are also arranged together immediately after NG60CEF1209. Therefore, only the last SC block for each STS transmitted in the last data field 1244 in the aggregated MF SC PPDU 1200 needs to be followed by the same guard interval 1251 preceding the last data field 1244. In other words, the required number of guard intervals subsequently added to these data fields is 2.
- the transmission efficiency is further improved because the number of necessary guard intervals is smaller than that in the first embodiment. Furthermore, since it is not necessary to change the sampling rate too frequently, the processing of Tx and Rx is simplified and the implementation complexity is further improved.
- the NG60STF 1207, the plurality of NG60CEF1209, each data field (eg, 1214), and the optional AGC & TRN-R / T subfield 1245 can be transmitted using variable bandwidth.
- each of the legacy STF 1201, legacy CEF 1203, legacy header 1205, and NG60 header (eg, 1212) can be transmitted using only standard bandwidth.
- FIG. 13 is a diagram illustrating transmission of the aggregated MF SC PPUD 1200 in a channel whose channel bandwidth is twice the standard bandwidth. As shown in FIG. 13, the original legacy STF, the original legacy CEF, the original legacy header, and the original all NG60 header are each duplicated in the frequency domain.
- the frequency offset for the original legacy STF, the original legacy CEF, the original legacy header, and the original all NG60 header can be set to 50% of the standard bandwidth.
- the frequency offset for the replicated legacy CEF, replicated legacy header, and all replicated NG60 headers can be set to -50% of the standard bandwidth.
- the Tx baseband processing device 700 for transmitting the MF SC PPDU 500 is easily adapted to transmit the aggregated MF SC PPDU 1200 because transmission bandwidth switching is unnecessary. be able to.
- the Rx baseband processing device 900 for receiving the MF SC PPDU 500 can be easily adapted to receive the aggregated MF SC PPDU 1200.
- the channel estimates obtained by the channel estimator 912 from the legacy CEF 1203 can be used to decode all of the NG60 headers 1212, 1222, 1232, and 1242 in the received aggregated MF SC PPDU 1200.
- the channel estimate obtained by the channel estimator 912 from the NG60CEF 1209 can be used to decode all of the data fields 1214, 1224, 1234, and 1244 in the received aggregate MF SC PPDU 1200. Furthermore, in order to separate the NG60 header from the corresponding data field, it is necessary to store useful information of all NG60 headers for decoding all of the data fields. However, since the useful information of one NG60 header is small (about 7 bytes), the required memory size may be small. As a result, compared to individual transmission and reception of the normal MF SC PPDU 500, transmission and reception of the aggregate MF SC PPDU 1200 does not significantly increase the implementation complexity.
- the equivalent data fields include NG60STF1207, NG60CEF1209, all NG60 headers, and all data fields in aggregated MF SC PPDU 1200.
- the total packet length of NG60STF1207, NG60CEF1209, all NG60 headers 1212, 1222, 1232, and 1242, and all data fields 1214, 1224, 1234, and 1244 are set as the length field in legacy header 1205. Is done.
- the receiver can easily determine the boundary between adjacent data fields, even if part of the NG60 header group preceding the NG60 header corresponding to a data field is lost. It becomes possible to decode the data field.
- FIG. 14 shows another example format of an aggregate MF SC PPDU 1400 according to a third embodiment of the present disclosure.
- Aggregated MF SC PPDU 1400 includes four MF SC PPDUs 1410, 1420, 1430, and 1440.
- Each of the four MF SC PPDUs contains an NG60 header and a data field.
- the MF SC PPDU 1410 includes an NG60 header 1412 and a data field 1414.
- the MF SC PPDU 1420 arranged at the start of the aggregated MF SC PPDU 1400 further includes a legacy STF 1401, a legacy CEF 1403, a legacy header 1405, an NG60STF 1407, a plurality of NG60CEF 1409s, and a data field 1424.
- the MF SC PPDU 1430 located at the end of the aggregate MF SC PPDU 1400 includes an NG60 header 1432 and a data field 1434, and further includes an optional AGC & TRN-R / T subfield 1435. Note that there is no IFS, preamble, and separator between MF SC PPDU transmissions in aggregated MF SC PPDU 1400. Therefore, the transmission efficiency is improved as compared with the normal transmission of the normal MF SC PPDU.
- all of the data fields in the aggregated MF SC PPDU 1400 have the same transmission bandwidth.
- other transmission parameters eg, the number of STSs N sts
- the number of STSs N sts for the data fields in the aggregated MF SC PPDU 1400 may be different.
- each of data field 1414 and data field 1444 has two STSs
- data field 1424 has one STS
- data field 1434 has three STSs.
- the number of NG60CEF 1409s depends on the maximum number of STSs between all data fields in the aggregated MF SC PPDU 1400. For example, if the maximum number of STSs between all data fields is 2, the number of NG60CEF 1409s can be set to 2. If the maximum number of STSs between all data fields is 3, the number of NG60CEF 1409s can be set to 4.
- each SC block includes the same number of data symbols and is prepended with the same guard interval 1451.
- all of the NG60 headers are collectively arranged immediately before the NG60STF 1407 in ascending order of the number of STSs (space-time streams) included in the corresponding data fields.
- the NG60 header 1422 is arranged immediately after the legacy header 1405, and thereafter, the NG60 header 1412, the NG60 header 1442, and the NG60 header 1432 follow in this order.
- all of the NG60 headers are collectively arranged immediately before the NG60STF 1407 in descending order of the number of STSs included in the corresponding data fields.
- all of the data fields are collectively arranged immediately after the NG60CEF 1409 in the same order as the NG60 header.
- the data field 1424 is placed immediately after the NG60CEF 1409, followed by the data field 1414, the data field 1444, and then the data field 1434.
- the required number of guard intervals to be added subsequently is 3.
- the transmission efficiency is further improved because the number of necessary guard intervals is smaller than that in the first embodiment. Furthermore, since it is not necessary to change the sampling rate very frequently, the TX / RX process is simplified and the mounting complexity is further improved.
- NG60STF 1407, multiple NG60CEF 1409, each data field (eg, 1414), and any AGC & TRN-R / T subfield 1435 may be transmitted using variable bandwidth.
- each of the legacy STF 1401, the legacy CEF 1403, the legacy header 1405, and the NG60 header (for example, 1412) can be transmitted using only the standard bandwidth.
- FIG. 13 is a diagram illustrating transmission of the aggregated MF SC PPDU 1400 in a channel whose channel bandwidth is twice the standard bandwidth.
- the Tx baseband processing device 700 for transmitting the MF SC PPDU 500 can be easily adapted to transmit the aggregated MF SC PPDU 1400.
- the Rx baseband processing device 900 for receiving the MF SC PPDU 500 can be easily adapted to receive the aggregated MF SC PPDU 1400.
- the channel estimates obtained by the channel estimator 912 from the legacy CEF 1403 can be used to decode all of the NG60 headers 1412, 1422, 1432, and 1442 in the received aggregated MF SC PPDU 1400.
- the channel estimate obtained by the channel estimator 912 from the NG60CEF 1409 can be used to decode all of the data fields 1414, 1424, 1434, and 1444 in the received aggregate MF SC PPDU 1400. Furthermore, in order to separate the NG60 header from the corresponding data field, it is necessary to store useful information of all NG60 headers for decoding all of the data fields. However, since the useful information of one NG60 header is small (about 7 bytes), the required memory size may be small. As a result, compared to individual transmission and reception of the normal MF SC PPDU 500, transmission and reception of the aggregated MF SC PPDU 1400 does not significantly increase the implementation complexity.
- the legacy STA can decode the legacy header 1405, but cannot decode the remaining part of the aggregated MF SC PPDU 1400.
- the additional PPDU field in the legacy header 1405 must be set to zero.
- the aggregated MF SC PPDU 1400 must be seen as a normal legacy SC PPDU 100 instead of the legacy aggregated SC PPDU 400.
- the equivalent data fields include NG60STF1407, NG60CEF1409, all NG60 headers, and all data fields in aggregated MF SC PPDU 1400.
- the total packet length of NG60STF1407, NG60CEF1409, all NG60 headers 1412, 1422, 1432, and 1442, and all data fields 1414, 1424, 1434, and 1444 is set as the length field in legacy header 1405 Is done.
- the receiver can easily determine the boundary between adjacent data fields, even if part of the NG60 header group preceding the NG60 header corresponding to a data field is lost. It becomes possible to decode the data field.
- FIG. 15 is a block diagram illustrating an exemplary architecture of a wireless communication device 1500 according to this disclosure.
- the wireless communication device 1500 includes a controller 1502, a Tx processing device 1510, an Rx processing device 1520, and a plurality of antennas 1530.
- the controller 1502 includes a PPDU generator 1504 configured to generate a PPDU such as, for example, an MF PPDU or an aggregate MF PPDU.
- the Tx processor 1510 includes a Tx baseband processor 1512 and a Tx RF front end 1514.
- the Rx processor 1520 includes an Rx baseband processor 1522 and an Rx RF front end 1524.
- the Tx baseband processor 1512 is shown in FIG. 7, and the Rx baseband processor 1522 is shown in FIG.
- the generated PPDU is transmitted via the antenna 1530 after transmission processing by the Tx processing device 1510.
- controller 1502 is configured to analyze and process PPDUs received via antenna 1530 after receiver processing by Rx processor 1520.
- the present disclosure can be applied to a method of formatting and transmitting an aggregate PPDU (physical layer protocol data unit) in a wireless communication system.
- aggregate PPDU physical layer protocol data unit
Abstract
Description
図10Aおよび図10Bは、本開示の第一実施形態による、集約MF SC PPDU1000の或る例のフォーマットを示す。この集約MF SC PPDU1000は4つのMF SC PPDUを含む。4つのMF SC PPDUの各々は、NG60ヘッダおよびデータフィールドを含む。例えば、第一MF SC PPDU1010は、NG60ヘッダ1012およびデータフィールド1014を含む。集約MF SC PPDU1000の開始部に配置された第一MF SC PPDU1010は、レガシーSTF1001、レガシーCEF1003、レガシーヘッダ1005、NG60STF1007、および複数のNG60CEF1009をさらに含む。第一MF SC PPDU1010の次に配置された第二MF SC PPDU1020は、NG60ヘッダ1022およびデータフィールド1024を含む。集約MF SC PPDU1000の終端部に配置された最後のMF SC PPDU1040は、任意のAGC&TRN-R/Tサブフィールド1045をさらに含む。集約MF SC PPDU1000中のMF SC PPDU伝送の間にはIFS、プリアンブル、および分離部がないことに留意する。したがって、通常のMF SC PPDU500の個別送信に比べて伝送効率は向上する。
図12は、本開示の第二実施形態による、集約MF SC PPUD1200の別の例のフォーマットを示す。集約MF SC PPDU1200は、4つのMF SC PPDU1210、1220、1230、および1240を含む。4つのMF SC PPDUの各々は、NG60ヘッダおよびデータフィールドを含む。例えば、MF SC PPDU1210は、NG60ヘッダ1212およびデータフィールド1214を含む。集約MF SC PPDU1200の開始部に配置された第一MF SC PPDU1210は、レガシーSTF1201と、レガシーCEF1203と、レガシーヘッダ1205と、NG60STF1207と、複数のNG60CEF1209とをさらに含む。集約MF SC PPDU1200の終端部に配置された最後のMF SC PPDU1240は、任意のAGC&TRN-R/Tサブフィールド1245をさらに含む。集約MF SC PPDU1200中のMF SC PPDU伝送の間には、IFS、プリアンブル、および分離部がないことに留意する。したがって、通常のMF SC PPDU500の個別送信に比べて伝送効率は向上する。
図14は、本開示の第三実施形態による、集約MF SC PPDU1400の別の例のフォーマットを示す。集約MF SC PPDU1400は、4つのMF SC PPDU1410、1420、1430、および1440を含む。4つのMF SC PPDUはそれぞれ、NG60ヘッダおよびデータフィールドを含む。例えば、MF SC PPDU1410は、NG60ヘッダ1412およびデータフィールド1414を含む。集約MF SC PPDU1400の開始部に配置されたMF SC PPDU1420は、レガシーSTF1401、レガシーCEF1403、レガシーヘッダ1405、NG60STF1407、複数のNG60CEF1409、およびデータフィールド1424をさらに含む。集約MF SC PPDU1400の終端部に配置されたMF SC PPDU1430は、NG60ヘッダ1432およびデータフィールド1434を含み、任意のAGC&TRN-R/Tサブフィールド1435をさらに含む。なお、集約MF SC PPDU1400中のMF SC PPDU伝送の間には、IFS、プリアンブル、および分離部はないことに留意する。したがって、通常のMF SC PPDUの個別送信に比べ伝送効率は向上する。
702 スクランブラ
704 LDPCエンコーダ
706 モジュレータ
708 MIMOエンコーダ
710 シンボルブロッキングおよびガード挿入ブロック
712 第一変調機能ブロック
714 第二変調機能ブロック
716 第三変調機能ブロック
900 Rxベースバンド処理装置
902 シンボルブロッキング解除およびガード除去ブロック
904 MIMOデコーダ
906 復調器
908 LDPCデコーダ
910 デスクランブラ
912 チャネル推定器
914 第一復調機能ブロック
916 第二復調機能ブロック
918 第三復調機能ブロック
1500 ワイヤレス通信装置
1502 コントローラ
1504 PPDUジェネレータ
1510 Tx処理装置
1512 Txベースバンド処理装置
1514 Tx RFフロントエンド
1520 Rx処理装置
1522 Rxベースバンド処理装置
1524 Rx RFフロントエンド
1530 アンテナ
Claims (18)
- レガシープリアンブルと、レガシーヘッダと、非レガシープリアンブルと、複数の非レガシーヘッダと、複数のデータフィールドとを含む集約物理層プロトコルデータユニット(集約PPDU)を有する伝送信号を生成する伝送信号ジェネレータと、
前記生成された伝送信号を送信するトランスミッタであって、前記レガシープリアンブル、前記レガシーヘッダ、および前記複数の非レガシーヘッダは、標準帯域幅を使って送信され、一方、前記非レガシープリアンブル、および前記複数のデータフィールドは、前記標準帯域幅以上の可変帯域幅を使って送信され、非レガシーヘッダと対応するデータフィールドとの複数のセットは、時間領域で逐次的に送信される、前記トランスミッタと、
を含む伝送装置。 - 前記非レガシープリアンブルは、非レガシーショートトレーニングフィールド(STF)と複数の非レガシーチャネル推定フィールド(CEF)とをこの順序で含み、
前記複数の非レガシーヘッダの一つは前記非レガシーSTFの直前に配置され、その対応するデータフィールドはその対応する非レガシーCEFの直後に配置され、一方、残りの前記非レガシーヘッダの各々はその対応するデータフィールドの直前に配置される、
請求項1に記載の伝送装置。 - 前記複数の非レガシーヘッダの各々の中で送信される、シングルキャリア(SC)ブロックまたは直交周波数分割多重(OFDM)シンボルはガード間隔をプリペンドされ、前記複数の非レガシーヘッダの各々の中で送信される最終のSCブロックは前記プリペンドされたガード間隔と同一のガード間隔を後続付加される、
請求項2に記載の伝送装置。 - 前記複数のデータフィールドの各々の中で送信される、時空間ストリームごとのシングルキャリア(SC)ブロックまたは直交周波数分割多重(OFDM)シンボルはガード間隔をプリペンドされ、前記複数のデータフィールドの各々中で送信される、時空間ストリームごとの最終SCブロックは、前記プリペンドされたガード間隔と同一のガード間隔を後続付加される、
請求項2に記載の伝送装置。 - 前記非レガシープリアンブルは、非レガシーショートトレーニングフィールド(STF)と複数の非レガシーチャネル推定フィールド(CEF)とをこの順序で含み、
前記複数の非レガシーヘッダは前記非レガシーSTFの直前に配置され、一方、前記複数のデータフィールドは前記複数の非レガシーCEFの直後に配置される、
請求項1に記載の伝送装置。 - 前記複数の非レガシーヘッダは、それらが対応するデータフィールドの時空間ストリームの数の降順または昇順に配置され、
前記複数のデータフィールドは、前記複数の非レガシーCEFの直後に、それらが対応する非レガシーヘッダの前記順序と同じ順序で配置される、
請求項5に記載の伝送装置。 - 前記複数の非レガシーヘッダの各々の中で送信される、シングルキャリア(SC)ブロックまたは直交周波数分割多重(OFDM)シンボルはガード間隔をプリペンドされ、最後の非レガシーヘッダの中で送信される最終のSCブロックは前記プリペンドされたガード間隔と同一のガード間隔を後続付加される、
請求項5に記載の伝送装置。 - 前記複数のデータフィールドの各々の中で送信される、時空間ストリームごとのシングルキャリア(SC)ブロックまたは直交周波数分割多重(OFDM)シンボルはガード間隔をプリペンドされ、前記複数のデータフィールドの各々の中で送信される時空間ストリームごとの最終SCブロックは、前記プリペンドされたガード間隔と同一のガード間隔を後続付加される、
請求項5に記載の伝送装置。 - 前記後続付加されたガード間隔中のシンボルは反転される、
請求項8に記載の伝送装置。 - レガシープリアンブルと、レガシーヘッダと、非レガシープリアンブルと、複数の非レガシーヘッダと、複数のデータフィールドとを含む集約物理層プロトコルデータユニット(集約PPDU)を有する伝送信号を生成するステップと、
前記生成された伝送信号を送信するステップであって、前記レガシープリアンブル、前記レガシーヘッダ、および前記複数の非レガシーヘッダは、標準帯域幅を使って送信され、一方、前記非レガシープリアンブル、および前記複数のデータフィールドは、前記標準帯域幅以上の可変帯域幅を使って送信され、非レガシーヘッダと対応するデータフィールドとの複数のセットは、時間領域で逐次的に送信される、前記送信するステップと、
を含む伝送方法。 - 前記非レガシープリアンブルは、非レガシーショートトレーニングフィールド(STF)と複数の非レガシーチャネル推定フィールド(CEF)とをこの順序で含み、
前記複数の非レガシーヘッダの一つは前記非レガシーSTFの直前に配置され、その対応するデータフィールドはその対応する非レガシーCEFの直後に配置され、一方、残りの前記非レガシーヘッダの各々はその対応するデータフィールドの直前に配置される、
請求項10に記載の伝送方法。 - 前記複数の非レガシーヘッダの各々の中で送信される、シングルキャリア(SC)ブロックまたは直交周波数分割多重(OFDM)シンボルはガード間隔をプリペンドされ、前記複数の非レガシーヘッダの各々の中で送信される最終のSCブロックは前記プリペンドされたガード間隔と同一のガード間隔を後続付加される、
請求項11に記載の伝送方法。 - 前記複数のデータフィールドの各々の中で送信される、時空間ストリームごとのシングルキャリア(SC)ブロックまたは直交周波数分割多重(OFDM)シンボルはガード間隔をプリペンドされ、前記複数のデータフィールドの各々の中で送信される、時空間ストリームごとの最終SCブロックは、前記プリペンドされたガード間隔と同一のガード間隔を後続付加される、
請求項11に記載の伝送方法。 - 前記非レガシープリアンブルは、非レガシーショートトレーニングフィールド(STF)と複数の非レガシーチャネル推定フィールド(CEF)とをこの順序で含み、
前記複数の非レガシーヘッダは、前記非レガシーSTFの直前に配置され、一方、前記複数のデータフィールドは前記複数の非レガシーCEFの直後に配置される、
請求項10に記載の伝送方法。 - 前記複数の非レガシーヘッダは、それらが対応するデータフィールドの時空間ストリームの数の降順または昇順に配置され、
前記複数のデータフィールドは、前記複数の非レガシーCEFの直後に、それらが対応する非レガシーヘッダの前記順序と同じ順序で配置される、
請求項14に記載の伝送方法。 - 前記複数の非レガシーヘッダの各々の中で送信される、シングルキャリア(SC)ブロックまたは直交周波数分割多重(OFDM)シンボルはガード間隔をプリペンドされ、最後の非レガシーヘッダの中で送信される最終のSCブロックは前記プリペンドされたガード間隔と同一のガード間隔を後続付加される、
請求項14に記載の伝送方法。 - 前記複数のデータフィールドの各々の中で送信される、時空間ストリームごとのシングルキャリア(SC)ブロックまたは直交周波数分割多重(OFDM)シンボルはガード間隔をプリペンドされ、前記複数のデータフィールドの各々の中で送信される、時空間ストリームごとの最終SCブロックは、前記プリペンドされたガード間隔と同一のガード間隔を後続付加される、
請求項14に記載の伝送方法。 - 前記後続付加されたガード間隔中のシンボルは反転される、
請求項17に記載の伝送方法。
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JPWO2018043368A1 (ja) * | 2016-09-01 | 2019-06-24 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカPanasonic Intellectual Property Corporation of America | 送信装置および送信方法 |
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CN111034141B (zh) * | 2017-09-06 | 2022-06-28 | 松下电器(美国)知识产权公司 | 发送装置、发送方法、接收装置、以及接收方法 |
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EP3681118A4 (en) * | 2017-09-06 | 2020-10-28 | Panasonic Intellectual Property Corporation of America | SENDING DEVICE, SENDING METHOD, RECEIVING DEVICE, AND RECEIVING METHOD |
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