RU2776306C2 - Transmission device and transmission method - Google Patents

Abstract

FIELD: wireless communication.

SUBSTANCE: transmission device containing a signal processing scheme and a wireless unit forms an aggregated physical layer convergence protocol data unit (hereinafter – A-PPDU), including the first PPDU and the second PPDU unit(s), and transmits A-PPDU. The first PPDU contains the first part and the second part. The first part of the first PPDU includes a set of valid STF, valid CEF, a valid header field, and a forward header field, which is transmitted, using a standard channel band, and another set of valid STF, valid CEF, a valid header field, and a forward header field, which is duplicated in the direction of a frequency axis and is transmitted, using the mentioned standard channel band. The second part of the first PPDU unit includes forward STF, forward CEF, and a data field, which are transmitted, using a variable channel band. Each of the second PPDU includes one or more forward header fields, and one or more data fields, which are transmitted, using the mentioned variable channel band, and a protective interval is added to each of the first part of the first PPDU, the second part of the first PPDU, and the second PPDU unit(s).

EFFECT: increase in the efficiency of transmission.

10 cl, 28 dwg

Description

FIELD OF TECHNOLOGY TO WHICH THE INVENTION RELATES

[0001] The present invention relates to wireless communication, and in particular, relates to an apparatus and method for configuring and transmitting aggregated Physical Layer Convergence Protocol Data Units (PPDU: PLCP Protocol Data Unit) in a wireless communication system.

BACKGROUND OF THE INVENTION

[0002] There has been growing interest in millimeter wave networks that use the 60 GHz band, which does not require a license. HD (high-definition) wireless technology is a wireless communication standard that was the first in the industry to use the 60 GHz band and allows for the wireless transmission, at speeds of several gigabytes per second, of at least one of audio, high-definition video, and data between consumer electronic devices , personal computers and mobile devices.

[0003] A separate wireless communication technology that operates in the 60 GHz band is WiGig technology, which has been standardized as an IEEE 802.11ad standard by the IEEE (Institute of Electrical and Electronics Engineers).

[0004] WiGig technology allows physical layer data rates up to 6.7 Gbps using the standard 2.16 GHz channel bandwidth. WiGig technology supports both SC (Single Carrier) and OFDM (Orthogonal Frequency Division Multiplexing) modulation. Additionally, WiGig technology supports Aggregate-PPDUs (Physical Convergence Protocol Aggregated Data Units, hereinafter referred to as "A-PPDUs") to improve transmission efficiency (see NPL 1).

[0005] A-PPDU is a technology where two or more PPDUs are transmitted without providing IFS (Inter Frame Diversity) or preambles between them.

[0006] WiGig technology can be used instead of cables in a wired digital interface. For example, WiGig technology can be used to implement a wireless USB (Universal Serial Bus) link for instant synchronization when streaming video to smartphones, tablets, or via an HDMI (High Definition Multimedia Interface) link (registered trademark, hereinafter everywhere).

[0007] The latest wired digital interfaces (for example, USB 3.5 and HDMI 1.3) allow data transfer rates up to several tens of Gb / s, and, accordingly, WiGig technology is designed to compete with them. A technology where backward compatibility with current WiGig technology (incumbent WiGig) is maintained while maintaining data transmission over a variable channel bandwidth of standard channel bandwidth or higher is desirable for WiGig NG60 (new generation 60 GHz) technology, to achieve physical layer data rates up to several tens of Gbps

BIBLIOGRAPHY

non-patent source

[0008] NPL 1: IEEE 802.11ad-2012 P 237 9.13a DMG A-PPDU operation

SUMMARY OF THE INVENTION

[0009] To maintain backward compatibility with legacy WiGig devices, NG60 WiGig (non-legacy WiGig) devices are required to support both LF (legacy format) PPDUs using the standard channel bandwidth specified in IEEE 802.11ad and and MF (Mixed Format) PPDUs using a variable channel bandwidth.

[0010] Accordingly, there is a need regarding NG60 WiGig (forward WiGig) devices to determine the format and transmission method for the A-PPDU where the transmission efficiency can be maximized.

[0011] A non-limiting embodiment of the present invention is to provide an advanced A-PPDU transmission device, which can improve transmission efficiency.

[0012] According to an aspect of the present invention, the transmission device includes: a duplication unit, which, of the first Physical Layer Convergence Protocol Data Units (PPDUs) including a valid STF, a valid CEF, a valid header field, a forward STF, and a forward CEF, one or more forward header fields, including one or more forward headers, and one or more data fields, including one or more payload data, duplicates, in the number (N - 1) (where N is an integer greater than or equal to 2) in the frequency axis direction of the effective STF, the effective CEF, the effective header field and the forward header field located at the beginning, serving as the first PPDU transmitted in the standard channel bandwidth; a guard interval inserter that adds a guard interval to each of the first PPDU transmitted in the standard channel band, the duplicated first PPDU transmitted in the standard channel band, the forward STF, the forward CEF, and one or more data fields serving as of the first PPDUs , a first PPDU transmitted in a variable channel bandwidth that is N times the standard channel bandwidth, and a forward header field and one or more data fields transmitted in a variable channel bandwidth from second PPDUs including one or more forward header fields and one or more data fields, and outputs as an aggregate physical layer convergence protocol (A-PPDU) data unit; and a wireless unit that transmits the A-PPDU.

[0013] The technology disclosed in the present specification is a transmission device that generates and transmits a forward A-PPDU formed by a valid STF (short training field), a valid CEF (channel estimation field), a valid header field, a forward STF, a forward CEF, multiple forward header fields, and multiple data fields. The valid STF, valid CEF, valid header field, and PPDU forward header fields located at the beginning of the forward A-PPDU are transmitted using the standard channel bandwidth, while on the other hand, the forward STF, forward CEF, PPDU forward header fields located at the second in sequential order and then in forward A-PPDU, and multiple data fields are transmitted using a variable channel bandwidth. In SC mode, all fields of the forward A-PPDU are transmitted by SC modulation, while on the other hand, in OFDM mode, the effective STF, the effective CEF, the effective header field, the forward STF, and the forward header fields of the PPDU located at the beginning of the forward A- PPDUs are transmitted by SC modulation, while on the other hand, forward CEF, forward header fields of PPDUs arranged in second consecutive order and then in forward A-PPDU, and multiple data fields are transmitted using OFDM modulation.

[0014] It should be noted that general or specific embodiments may be implemented as a system, method, integrated circuit, computer program, storage medium, or any combination thereof.

[0015] The transmission efficiency can be improved using the advanced A-PPDU transmission device and the transmission method according to the present invention.

[0016] Additional benefits and advantages of the disclosed embodiments are apparent from the description of the invention and the drawings. Benefits and/or advantages may be individually obtained by various embodiments and features of the description and drawings, which are not intended to cover one/o or more of such benefits and/or advantages.

BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG. 1 is a diagram showing an example of the current technology LF SC PPDU format.

Fig. 2 is a diagram showing an example structure of a valid LF SC PPDU header according to the current technology.

Fig. 3 is a diagram showing a configuration example of an LF SC PPDU transmission device according to the current technology.

Fig. 4 is a diagram showing an example of the LF SC A-PPDU format according to the current technology.

Fig. 5 is a diagram showing an example of the LF OFDM PPDU format according to the current technology.

Fig. 6 is a diagram showing an example of the structure of an effective LF OFDM PPDU header according to the current technology.

Fig. 7 is a diagram showing a configuration example of an LF OFDM PPDU transmission device according to the current technology.

Fig. 8 is a diagram showing an example of the LF OFDM A-PPDU format according to the current technology.

Fig. 9 is a diagram showing an example of MF SC PPDU format transmission over a standard channel bandwidth according to the present invention.

Fig. 10 is a diagram showing an example of a forward header structure according to the present invention.

Fig. 11 is a diagram showing an example of an MF SC PPDU format transmitted in a variable channel bandwidth that is twice the standard channel bandwidth of the present invention.

Fig. 12 is a diagram showing an example of a detailed configuration of an SC block in an MF SC data field of a PPDU according to the present invention.

Fig. 13 is a diagram showing an example of an MF SC A-PPDU format transmitted in a standard channel band according to the present invention.

Fig. 14 is a diagram showing an example of an MF SC A-PPDU format transmitted in a variable channel bandwidth that is twice the standard channel bandwidth of the present invention.

Fig. 15 is a diagram showing an example of an MF OFDM PPDU format transmitted in a standard channel band according to the present invention.

Fig. 16 is a diagram showing an example of an MF OFDM A-PPDU transmitted in a variable channel bandwidth that is twice the standard channel bandwidth of the present invention.

Fig. 17 is a diagram showing an example of subcarrier mapping with respect to an MF OFDM PPDU data field according to the present invention.

Fig. 18 is a diagram showing an example of an MF OFDM A-PPDU format transmitted in a standard channel band according to the present invention.

Fig. 19 is a diagram showing an example of an MF OFDM A-PPDU format transmitted in a variable channel bandwidth that is twice the standard channel bandwidth of the present invention.

Fig. 20 is a diagram showing an example of an MF SC A-PPDU format transmitted in a variable channel bandwidth that is twice the standard channel bandwidth according to the first embodiment of the present invention.

Fig. 21 is a diagram showing an example of a detailed configuration of an SC block in a forward field of an MF SC header of an A-PPDU according to the first embodiment of the present invention.

Fig. 22 is a diagram showing a configuration example of an MF SC A-PPDU transmission device according to the first embodiment of the present invention.

Fig. 23 is a diagram showing a configuration example of a duplication unit according to the first embodiment of the present invention.

Fig. 24 is a diagram showing an example of an MF OFDM PPDU format transmitted in a standard channel band according to the second embodiment of the present invention.

Fig. 25 is a diagram showing an example of an MF OFDM A-PPDU transmitted in a variable channel bandwidth that is twice the standard channel bandwidth according to the second embodiment of the present invention.

Fig. 26 is a diagram showing an example of subcarrier mapping with respect to an MF OFDM PPDU forward header field according to the second embodiment of the present invention.

Fig. 27 is a diagram showing a configuration example of an MF OFDM A-PPDU transmission device according to the second embodiment of the present invention.

Fig. 28 is a diagram showing an example of a method for generating an SC block in a forward field of an MF SC A-PPDU header in a case where the GI period has been changed according to the third embodiment of the present invention.

DESCRIPTION OF EMBODIMENTS

[0018] Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Detailed descriptions of known functions and configurations included in this specification have been omitted from the following description for the sake of clarity and clarity.

[0019] FIG. 1 is a diagram showing an example of the LF SC PPDU 100 format according to the current technology. The LF SC PPDU 100 includes a valid STF 101, a valid CEF 102, a valid header field 103 and a data field 104, an optional AGC subfield 105, and an optional TRN-R/T subfield 106.

[0020] The current STF 101 is used for packet detection, AGC (automatic gain control), frequency offset estimation, and timing. The current CEF 102 is used for channel estimation. The valid header field 103 includes a valid header 109 which specifies the details of the LF SC PPDU 100. FIG. 2 shows the multiple fields included in each valid header 109.

[0021] Data field 104 includes payload data 110 of the LF SC PPDU 100. At least one of audio, video, and data is included in payload data 110. The data octet count of data field 104 is given by the length field of each effective header 109, and the modulation format and code rate used in data field 104 is given by the MCS (modulation and coding scheme) field of the effective header 109.

[0022] AGC subfield 105 and TRN-R/T subfield 106 are present when the LF SC PPDU 100 is used for fine lobe adjustment or tracking control. The length of the AGC subfield 105 and the TRN-R/T subfield 106 are given by the length training field of the effective header 109.

[0023] Whether the TRN-R/T subfield 106 is used as the TRN-R subfield or the TRN-T subfield is specified by the Packet Type field of the current header 109.

[0024] All fields of the LF SC PPDU 100 are transmitted by SC modulation using the standard 2.16 GHz channel bandwidth as shown in FIG. one.

[0025] FIG. 3 is a diagram showing a configuration example of an LF SC PPDU transmitting apparatus 300 according to the current technology. The transmission device 300 has a baseband signal processing unit 301, a DAC (digital to analog converter) 302, an RF (radio frequency) output stage 303, and an antenna 304. Additionally, the baseband signal processing unit 301 has a scrambler 305, an LDPC (low parity check) density), a modulator 307, a symbol blocking block 308, and a GI (guard interval) inserter 309 .

[0026] The scrambler 305 scrambles the bits of the valid header field 103 and the data field 104 . The scrambler 305 is initialized according to the valid header scrambler initialization field 109, and starts scrambling from the MCS field of the valid header 109.

[0027] The LDPC encoder 306 LDPC-codes the effective header field 103 at a code rate 3/4 and generates an LDPC codeword. The modulator 307 converts the LDPC codeword into 448 complex vector diagram points using π/2-BPSK (binary phase shift keying). The symbol blocking block 308 generates blocks of complex points of the vector diagram in increments of 448, thus generating blocks of symbols. The GI inserter 309 adds the GI 108 formed by the 64-character Naked system that has been set in advance to the beginning of the character block, thereby generating the SC block.

[0028] The LDPC encoder 306 LDPC encodes the payload data 110 in the data field 104 at the code rate specified in the MCS field in the effective header, thereby generating an LDPC codeword. The modulator 307 converts the LDPC codeword into multiple complex vector diagram points using the modulation format specified in the MCS field in the effective header.

[0029] The block 308 blocking symbols forms blocks of complex points of the vector diagram with a step of 448, thus generating blocks of symbols.

[0030] The GI inserter 309 adds the same GI 108 as the valid header field 103 to the beginning of each character block, thus generating the SC block 107. Additionally, to facilitate correction in the frequency domain, the GI inserter 309 adds GI 108a to the end of the final SC block 107 of the data field 104. Thus, in the case where the supplementary PPDU field of the valid header is not equal to 1, GI 108a is added.

[0031] The DAC 302 converts the digital baseband signals including the LF SC PPDU 100 generated at the baseband signal processing unit 301 into analog baseband signals.

[0032] The RF output stage 303 converts analog baseband signals including the LF SC PPDU 100 into RF signals by frequency conversion, amplification, and other such processing. Antenna 304 radiates wireless frequency signals into space.

[0033] FIG. 4 is a diagram showing an example of the LF SC A-PPDU 400 format according to the current technology. LF SC A-PPDU 400 is formed from three LF SC PPDUs 401, 402, and 403. LF SC PPDUs are associated without IFS or preamble between them, and include valid header fields 406, 408, and 410, and data fields 407, 409, and 411 .

[0034] For example, the LF SC PPDU 401 located at the beginning of the LF SC A-PPDU 400 includes a valid header field 406, a data field 407, a valid STF 404, and a valid CEF 405. LF SC PPDU 403 located at the end of the LF SC A-PPDU 400 includes a valid header field 410, a data field 411, an optional AGC subfield 412, and an optional TRN-R/T subfield 413.

[0035] The definitions of the valid STF 404, valid CEF 405, valid header fields 406, 408, and 410, AGC subfield 412, and TRN-T/R subfield 413 are identical to the definitions of the corresponding LF SC fields of PPDU 100 in FIG. 1, so description will be omitted.

[0036] With the exception of LF SC PPDU 403, LF SC PPDU 401, for example, is followed by another LF SC PPDU 402, so the additional PPDU field of the effective field 410 of the LF SC PPDU 403 header is set to 0, then the additional PPDU fields from the effective fields 406 and Header 408 of other LF SC PPDUs 401 and 402 are set to 1.

[0037] For example, with the exception of data field 411 of the LF SC PPDU 403, the final block 414 SC of the data field 407 is followed by a block 415 SC at the beginning of the valid header field 408 of another LF SC PPDU 402, so the addition of GI 417a is excluded, but after the end of the final block 416 SC data field 411 LF SC PPDU 403 does not follow any SC, so GI 417a is added. Thus, in the case where the additional PPDU field of the valid header is 1, the addition of GI 417a is excluded.

[0038] Note that all LF SC fields of A-PPDU 400 are transmitted by SC modulation using the standard 2.16 GHz channel bandwidth.

[0039] FIG. 5 is a diagram showing an example of the LF OFDM PPDU 500 format according to the current technology. The LF OFDM PPDU 500 includes a valid STF 501, a valid CEF 502, a valid header field 503, a data field 504, an optional AGC subfield 505, and an optional TRN-R/T subfield 506.

[0040] The definitions of the valid STF 501, the valid CEF 502, the AGC subfield 505, and the TRN-R/T subfield 506 are identical to the definitions of the respective LF SC fields of the PPDU 100 in FIG. 1, so description will be omitted.

[0041] The valid header field 503 includes a valid header 510 specifying the details of the LF OFDM PPDU 500. FIG. 6 shows the multiple fields included in the effective header 510. The data field 504 includes the payload data 511 of the LF OFDM PPDU 500.

[0042] Note that all LF OFDM PPDU 500 fields are transmitted using the standard 2.16 GHz channel bandwidth.

[0043] Valid STF 501, valid CEF 502, AGC subfield 505, and TRN-R/T subfield 506 are transmitted by SC modulation, while valid header field 503 and data field 504 are transmitted by OFDM modulation.

[0044] The effective header field 503 and the data field 504 transmitted by OFDM modulation are transmitted at a higher sampling rate than the effective STF 501, the effective CEF 502, the AGC subfield 505, and the TRN-R/T subfield transmitted by the SC modulation. Accordingly, sample rate conversion processing is required at the boundary between the valid CEF 502 and the valid header field 503 and the boundary between the data field 504 and the AGC subfield 505.

[0045] FIG. 7 is a diagram showing a configuration example of an LF OFDM PPDU transmission device 700 according to the current technology. The transmission apparatus 700 has a baseband signal processing unit 701, a DAC 702, an RF output stage 703, and an antenna 704. The baseband signal processing unit 701 further includes a scrambler 705, an LDPC encoder 706, a modulator 707, a subcarrier mapping unit 708, an IFFT unit 709 and a GI insert block 710.

[0046] The scrambler 705 scrambles the bits of the valid header field 503 and the data field 504. The scrambler 705 is initialized according to the scrambler initialization field of the valid header, and starts scrambling from the MCS field of the valid header.

[0047] The LDPC encoder 706 performs LDPC encoding of the effective header 510 at a code rate 3/4 and generates an LDPC codeword. A modulator 707 converts the LDPC codeword into 336 complex vector diagram points using QSPK (Quadrature Phase Shift Keying). The subcarrier mapper 708 maps 336 complex vector diagram points to 336 data subcarriers according to predetermined rules.

[0048] There are 512 subcarriers in total, with the remaining 176 subcarriers used as the DC subcarrier, pilot subcarrier, and guard band. The IFFT block 709 converts the effective header 510 mapped to subcarriers in the frequency domain into time domain signals through 512 point IFFT processing. The GI inserter 710 copies the 128 trailing samples of the output signals from the IFFT block 709 and connects them to the start of the IFFT output signals as the GI 507, thereby generating OFDM symbols. Note that GI may be referred to as CP (cyclic prefix) in relation to OFDM symbols.

[0049] The LDPC encoder 706 performs LDPC encoding of the payload data 511, at the code rate specified in the MCS field in the effective header 510, thereby generating an LDPC codeword. The modulator 707 converts the LDPC codeword into multiple complex vector diagram points using the modulation format specified in the MCS field in the effective header 510.

[0050] The subcarrier mapper 708 maps 336 complex vector diagram points to 336 data subcarriers according to predetermined rules. There are 512 subcarriers in total, with the remaining 176 subcarriers used as the DC subcarrier, pilot subcarrier and guard band.

[0051] The IFFT block 709 converts payload data 511 mapped to subcarriers in the frequency domain into time domain signals through 512 point IFFT processing. The GI inserter 710 copies the 128 trailing samples of output signals from the IFFT block 709 and connects them to the beginning of the IFFT output signals as GIs 508 and 509, thereby generating OFDM symbols.

[0052] The DAC 702 converts the digital baseband signals including the LF OFDM PPDU 100 generated at the baseband signal processing unit 701 into analog baseband signals. The RF output stage 703 converts analog baseband signals including the LF OFDM PPDU 100 into RF signals by frequency conversion, amplification, and the like. Antenna 704 radiates wireless frequency signals into space.

[0053] FIG. 8 is a diagram showing an example of the LF OFDM A-PPDU 800 format according to the current technology. LF OFDM A-PPDU 800 is formed from three LF OFDM PPDUs 801, 802, and 803. LF OFDM PPDUs are associated without IFS or preamble between them, and include valid header fields 806, 808, and 810, and data fields 807, 809, and 811 .

[0054] The LF OFDM PPDU 801 located at the beginning of the LF OFDM A-PPDU 800 includes a valid header field 806, a data field 807, a valid STF 804, and a valid CEF 805.

[0055] The LF OFDM PPDU 803 located at the end of the LF OFDM A-PPDU 800 includes a valid header field 810, a data field 811, an optional AGC subfield 812, and an optional TRN-R/T subfield 813.

[0056] The definitions of the valid STF 804, valid CEF 805, valid header fields 806, 808, and 810, data fields 807, 809, and 811, AGC subfield 812, and TRN-R/T subfield 813 are identical to the definitions of the corresponding LF OFDM PPDU 500 fields in FIG. . 5, so description will be omitted.

[0057] FIG. 8, LF OFDM PPDUs 801 and 802 are followed by other LF OFDM PPDUs 802 and 803, so the additional PPDU fields from the LF OFDM PPDU header fields 806 and 808 801 and 802 are set to 1, while the additional PPDU field of the effective field 810 of the LF OFDM header A PPDU 803 that is not followed by an LF OFDM PPDU is set to 0.

[0058] FIG. 8, all fields of the LF OFDM A-PPDU 800 are transmitted by SC modulation using the standard 2.16 GHz channel bandwidth. The valid STF 804, valid CEF 805, AGC subfield 812, and TRN-R/T LF OFDM A-PPDU 800 subfield 813 are transmitted by SC modulation, while the valid headers 806, 808, 810 and data fields 807, 809 and 811 are transmitted by modulation OFDM.

[0059] Note that in FIG. 8, payload data 814 should not be followed by GI 815 at the last stage of each LF OFDM PPDU.

[0060] FIG. 9 is a diagram showing an example of the MF SC PPDU format 900 transmitted in a standard channel band according to the present invention. The MF SC PPDU 900 includes a valid STF 901, a valid CEF 902, a valid header field 903, a forward header field 904, a forward STF 905, a forward CEF 906, a data field 907, an optional AGC subfield 908, and an optional TRN-R/T subfield 909 .

[0061] Note, however, that forward STF 905 and forward CEF 906 may be omitted in the case where data field 907 is transmitted using SISO (single input single output), since the AGC level adjusted in the current STF 901 and the channel estimation results, obtained in the current CEF 902 may be used for the data field 907.

[0062] The definitions of the valid STF 901, valid CEF 902, valid header field 903, AGC subfield 908, and TRN-R/T subfield 909 are identical to the definitions of the corresponding LF SC fields of PPDU 100 in FIG. 1, so description will be omitted.

[0063] The forward header field 904 includes a forward header 913 that specifies the details of the MF SC PPDU 900. FIG. 10 shows the multiple fields included in the forward header.

[0064] In the case where forward STF 905 or forward CEF 906 is present in MF SC PPDU 900, GI 912 is added to the end of last SC block 910 of forward header field 904 to facilitate frequency domain equalization.

[0065] An advanced STF 905 is used to re-adjust the AGC. Forward CEF 906 is used to estimate the channel for field 907 data.

[0066] Data field 907 includes payload data 914 of the MF SC PPDU 900. The data octet count of data field 907 is given by the PSDU length field of each forward header, and the modulation format and code rate used in data field 907 is given by the forward MCS field of the forward header. header. GI 912a is added to the end of the last SC block 911 of data field 907 to facilitate frequency domain correction.

[0067] Note that all MF SC PPDU 900 fields are transmitted by SC modulation using the standard 2.16 GHz channel bandwidth.

[0068] FIG. 11 is a diagram showing an example of an MF SC PPDU format 1100 transmitted in a variable channel bandwidth that is twice the standard channel bandwidth of the present invention. MF SC PPDU 1100 includes valid STF 1101, valid CEF 1102, valid header field 1103, forward header field 1104, forward STF 1105, forward CEF 1106, data field 1107, optional AGC subfield 1108, and optional TRN-R/T subfield 1109 .

[0069] The definitions of valid STF 1101, valid CEF 1102, valid header field 1103, forward header field 1104, optional AGC subfield 1108, and optional TRN-R/T subfield 1109 are identical to the definitions of the corresponding MF SC fields of PPDU 900 in FIG. 9, so description will be omitted.

[0070] The channel bandwidth differs between the data field 1107, the current STF 1101 and the current CEF 1106, so forward STF 1105 and forward CEF 1106 are present in MF SC PPDU 1100. Accordingly, GI 1111 using the standard 2.16 GHz channel bandwidth is added to the end final block SC 1110 forward header field 1104.

[0071] FIG. 11, effective STF 1101, effective CEF 1102, effective header field 1103 and forward header field 1104 are duplicated and transmitted in the standard B channel band (= 2.16 GHz), each with a B/2 frequency offset that is half the standard B band. channel (= 1.08 GHz).

[0072] On the other hand, forward STF 1105, forward CEF 1106, data field 1107, AGC subfield 1108, and TRN-R/T subfield 1109 are transmitted in a variable 2B channel band that is twice the standard B channel band (= 4.32 GHz). Accordingly, sampling rate conversion processing is performed at the boundary between the forward header field 1104 and the forward STF 1105. Note that all MF SC fields of the PPDU 1100 are transmitted by SC modulation.

[0073] Although the illustration in FIG. 11 takes into account the bar occupied by each field, the illustration in the following diagrams will be done using the channel bar to simplify the drawings.

[0074] FIG. 12 is a diagram showing an example of a detailed configuration of an SC block in an MF SC data field of a PPDU according to the present invention. Illustrated are the number of symbols N _GI GI when using the standard channel bandwidth, the number of symbols N _D of payload data per SC block when using the standard channel bandwidth, the period GI T _GI , the data period T _D of the payload data, and the ratio of the standard channel bandwidth and the variable channel bandwidth. (= variable channel bandwidth/standard channel bandwidth) R _CB .

[0075] Accordingly, R _CB =1 indicates the configuration of the block SC of the data field 907 in FIG. 9, while R _CB =2 indicates the configuration of the block SC of the data field 1107 in FIG. eleven.

[0076] Symbol blocking and GI insertion are required to maintain interference cancellation capabilities regarding multipath wave delay and transmission efficiency, which, for example, serves to maintain the GI period at T _GI regardless of R _CB , and maintain a constant relationship between the GI period T _GI and data period T _D .

[0077] The length of the GI and payload data symbol is small in proportion to R _CB , so the GI period is maintained equal to T _GI by setting the GI size to R _CB × N _GI . In addition, the data period is maintained at T _D by setting the data size to R _CB × N _D . The relationship between the GI period and the data period remains constant due to the above settings.

[0078] Note that the configuration of the SC block in the forward header field transmitted in the standard channel band is the same as when R _CB =1.

[0079] FIG. 13 is a diagram showing an example of an MF SC A-PPDU 1300 format transmitted in a standard channel band according to the present invention. MF SC A-PPDU 1300 includes three MF SC PPDUs 1301, 1302, and 1303. MF SC PPDUs are associated without IFS or preamble between them, and include forward header fields and data fields.

[0080] For example, MF SC PPDU 1301 located at the beginning of MF SC A-PPDU 1300 includes forward header field 1307, data field 1310, valid STF 1304, valid CEF 1305, valid header field 1306, forward STF 1308, and forward CEF 1309.

[0081] Note, however, that in the case where data fields 1310, 1312, and 1314 are transmitted using SISO, forward STF 1308 and forward CEF 1309 may be omitted because the AGC level adjusted in the current STF 1304 and the channel estimation results obtained in current CEF 1305 may be used in data fields 1310, 1312 and 1314.

[0082] Note that the MF SC PPDU 1303 at the end of the MF SC A-PPDU 1300 includes a forward header field 1313, a data field 1314, an optional AGC subfield 1315, and an optional TRN-R/T subfield 1316.

[0083] The definitions of the current STF 1304, the current CEF 1305, the current header field 1306, the forward header fields 1307, 1311, and 1313, the forward STF 1308, the forward CEF 1309, the AGC subfield 1315, and the TRN-T/R subfield 1316 are identical to the definitions of the corresponding MF fields. SC PPDU 900 in FIG. 9, so description will be omitted.

[0084] MF SC PPDU 1303 is followed by another MF SC PPDU, so the extra PPDU field of the forward field 1313 of the MF SC PPDU 1303 header is set to 0, while MF SC PPDUs 1301 and 1302 are followed by other MF SC PPDUs 1302 and 1303, so the field the additional PPDU of the forward header fields (1307 and 1311) is set to 1.

[0085] Note that the additional PPDU field in the valid header field 1306 is set to 0, such that the MF SC A-PPDU 1300 will be received as a valid LF SC PPDU by the active device.

[0086] With the exception of the MF SC data field 1314 of the PPDU 1303, for example, the final SC block 1317 of the data field 1310 is followed by the SC block 1318 at the beginning of the forward header field 1311 of the next MF SC PPDU 1302, so adding GI 1320a is excluded, but the final SC block 1319 data field 1314 MF SC PPDU 1303, after which there is no next MF SC PPDU, no SC block follows, so GI 1320a is added to the end. Thus, in the case where the supplementary PPDU field of the valid header is 1, the addition of GI 1320a is excluded.

[0087] Note that all MF SC fields of A-PPDU 1300 are transmitted by SC modulation using the standard 2.16 GHz channel bandwidth.

[0088] FIG. 14 is a diagram showing an example of an MF SC A-PPDU 1400 format transmitted in a variable channel bandwidth that is twice the standard channel bandwidth. MF SC A-PPDU 1400 is formed from three MF SC PPDUs 1401, 1402 and 1403. MF SC PPDUs are associated without IFS or preamble between them, and include forward header fields and data fields.

[0089] For example, MF SC PPDU 1401 located at the beginning of MF SC A-PPDU 1400 includes forward header field 1407, data field 1410, valid STF 1404, valid CEF 1405, valid header field 1406, forward STF 1408, and forward CEF 1409.

[0090] Note that the MF SC PPDU 1403 located at the end of the MF SC A-PPDU 1400 includes a forward header field 1407, a data field 1410, an optional AGC subfield 1415, and an optional TRN-R/T subfield 1416.

[0091] The definitions of the current STF 1404, the current CEF 1405, the current header field 1406, the forward header fields (1407, 1411, and 1413), the forward STF 1408, the forward CEF 1409, the AGC subfield 1415, and the TRN-T/R subfield 1416 are identical to the definitions corresponding fields of the MF SC PPDU 1100 in FIG. 11, so description will be omitted.

[0092] The MF SC PPDU 1403 is not followed by another MF SC PPDU, for example, so the supplemental PPDU field of the forward header field 1413 is set to 0, while the MF SC PPDUs 1401 and 1402 are followed by another MF SC PPDU, so the supplementary PPDU field of the forward fields 1407 and 1411 header is set to 1.

[0093] Note that the valid header supplemental PPDU field in the valid header field 1406 is set to 0, such that the MF SC A-PPDU 1400 will be received as a valid LF SC PPDU by the active device.

[0094] Data fields 1410, 1412, and 1414 are transmitted in a wider channel bandwidth than forward header fields 1407, 1411, and 1413, so GI 1420a is added to the end of the final SC blocks 1418 and 1422 of forward header fields 1411 and 1413 in MF SC PPDU 1402 and 1403, even if the data fields 1412 and 1414 immediately follow the forward header fields 1411 and 1413.

[0095] MF SC PPDU 1403 is not followed by another MF SC PPDU, so GI 1421a is added to the end of final SC block 1419 of data field 1414.

[0096] On the other hand, MF SC PPDUs 1401 and 1402 are followed by other MF SC PPDUs 1402 and 1403, but the channel bandwidth differs between data fields 1410 and 1412 and subsequent forward header fields 1411 and 1413, so GI 1421a is added to the end of the final block 1417 and 1423 SC data fields 1410 and 1412, in the same way as with MF SC PPDU 1403.

[0097] In addition, sample rate conversion processing is performed at the boundaries between the data fields 1410 and 1412 and subsequent forward header fields 1411 and 1413.

[0098] FIG. 14, current STF 1404, current CEF 1405, current header field 1406, and forward header field 1407 are duplicated and transmitted in the standard B channel band (= 2.16 GHz), each with a B/2 frequency offset that is half the standard B channel band. (= 1.08 GHz).

[0099] On the other hand, forward STF 1408, forward CEF 1409, data fields 1410, 1412 and 1414, AGC subfield 1415, and TRN-R/T subfield 1416 are transmitted in a variable channel band 2B, which is twice as narrow as the standard B channel band ( = 4.32 GHz). Note that all MF SC A-PPDU 1400 fields are transmitted via SC modulation.

[0100] In FIG. 15 is a diagram showing an example of an MF OFDM PPDU 1500 format transmitted in a standard channel band according to the present invention. The MF OFDM PPDU 1500 includes a valid STF 1501, a valid CEF 1502, a valid header field 1503, a forward header field 1504, a forward STF 1505, a forward CEF 1506, a data field 1507, an optional AGC subfield 1508, and an optional TRN-R/T 1509. Note that in the case where the data field 1507 is transmitted using SISO, the forward STF 1505 and the forward CEF 1506 may be omitted because the AGC level adjusted in the current STF 1501 and the channel estimation results obtained in the current CEF 1502 may be used in field 1507 data.

[0101] The definitions of the valid STF 1501, valid CEF 1502, valid header field 1503, AGC subfield 1508, and TRN-R/T subfield 1509 are identical to the definitions of the corresponding LF OFDM PPDU 500 fields in FIG. 5, so description will be omitted. The configuration of the forward header included in the forward header field 1504 is the same as in FIG. ten.

[0102] All fields of the MF OFDM PPDU 1500 in FIG. 15 are transmitted using the standard 2.16 GHz channel bandwidth. The valid STF 1501, the valid CEF 1502, the valid header field 1503, the forward header field 1504, the forward STF 1505, the AGC subfield 1508, and the TRN-R/T subfield 1509 are transmitted by SC modulation, while the forward CEF 1506 and data field 1507 are transmitted by modulation OFDM.

[0103] Accordingly, GI 1511a is added to the end of the final SC block 1510 of the forward header field 1504 even when the forward STF 1505 and forward CEF 1506 are not present.

[0104] Forward CEF 1506 and data field 1507 that are transmitted by OFDM modulation are transmitted at a higher sampling rate than effective STF 1501, effective CEF 1502, effective header field 1503, forward header field 1504, forward STF 1505, AGC subfield 1508 and TRN-R/T subfield 1509, which are transmitted by SC modulation, in the same manner as with LF OFDM PPDU 500 in FIG. 5. Accordingly, sampling rate conversion processing is implemented at the boundary between the forward STF 1505 and the forward CEF 1506, and the boundary between the data field 1507 and the AGC subfield 1508.

[0105] In FIG. 16 is a diagram showing an example of an MF OFDM PPDU 1600 transmitted in a variable channel bandwidth that is twice the standard B channel bandwidth of the present invention. The MF OFDM PPDU 1600 includes a valid STF 1601, a valid CEF 1602, a valid header field 1603, a forward header field 1604, a forward STF 1605, a forward CEF 1606, a data field 1607, an optional AGC subfield 1608, and an optional TRN-R/T 1609.

[0106] The definitions of the valid STF 1601, valid CEF 1602, valid header field 1603, forward header field 1604, AGC subfield 1608, and TRN-R/T subfield 1609 are identical to the definitions of the corresponding MF OFDM PPDU 1500 fields in FIG. 15, so description will be omitted.

[0107] The channel bandwidth differs between data field 1607, effective STF 1601 and effective CEF 1602, so the forward STF 1605 and forward CEF 1606 are present in the MF OFDM PPDU 1600. Accordingly, GI 1611a is added to the end of the final SC block 1610 of the forward header field 1604.

[0108] In FIG. 16, effective STF 1601, effective CEF 1602, effective header field 1603 and forward header field 1604 are duplicated and transmitted in the standard B channel band (= 2.16 GHz), each with a B/2 frequency offset that is half the standard B band. channel (= 1.08 GHz). On the other hand, forward STF 1605, forward CEF 1606, data field 1607, AGC subfield 1608 and TRN-R/T subfield 1609 are transmitted in a variable channel band 2B, which is twice the standard channel B band (=4.32 GHz). Accordingly, sampling rate conversion processing is performed at the boundary between the forward header field 1604 and the forward STF 1605.

[0109] In addition, valid STF 1601, valid CEF 1602, valid header field 1603, forward header field 1604, forward STF 1605, AGC subfield 1608, and TRN-R/T 1609 are transmitted by SC modulation, while forward CEF 1606 and 1607 data is transmitted via OFDM modulation. Accordingly, sampling rate conversion processing is performed at the boundary between the forward STF 1605 and the forward CEF 1606, and at the boundary between the data field 1607 and the AGC subfield 1608.

[0110] In FIG. 17 is a diagram showing an example of mapping subcarriers in data fields 1507 and 1607 of MF OFDM PPDUs 1500 and 1600 according to the present invention. In FIG. 17 illustrates the number of data subcarriers N _SD (payload data symbol count) when standard channel bandwidth B is used, and the ratio of standard channel bandwidth and variable channel bandwidth (=variable channel bandwidth/standard channel bandwidth) R _CB .

[0111] Although in FIG. 17 illustrates data subcarriers for simplicity, DC subcarrier, pilot subcarrier and guard band are also present in the actual MF OFDM PPDU.

[0112] In FIG. 17, the number of data subcarriers increases in proportion to R _CB in the MF OFDM PPDU, so the number of payload data symbols to be mapped to data subcarriers also increases in proportion to R _CB .

[0113] In FIG. 18 is a diagram showing an example of an MF OFDM A-PPDU 1800 format transmitted in a standard channel band according to the present invention. MF OFDM A-PPDU 1800 is formed from three MF OFDM PPDUs 1801, 1802, and 1803. MF OFDM PPDUs are associated without IFS or preamble between them, and include forward header fields and data fields.

[0114] For example, the MF OFDM PPDU 1801 located at the beginning of the MF OFDM A-PPDU 1800 includes a forward header field 1807, a data field 1810, a valid STF 1804, a valid CEF 1805, a valid header field 1806, a forward STF 1808, and a forward CEF 1809.

[0115] Note that in the case where data fields 1810, 1812, and 1814 are transmitted using SISO, forward STF 1808 and forward CEF 1809 may be omitted because the AGC level adjusted in the current STF 1804 and the channel estimation results obtained in current CEF 1805 may be used in data fields 1810, 1812 and 1814.

[0116] The MF OFDM PPDU 1803 located at the end of the MF OFDM A-PPDU 1800 includes a forward header field 1807, a data field 1810, an optional AGC subfield 1815, and an optional TRN-R/T 1816.

[0117] Definitions of Valid STF 1804, Valid CEF 1805, Valid Header Field 1806, Forward Header Fields 1807, 1811, and 1813, Forward STF 1808, Forward CEF 1809, AGC Subfield 1815, and TRN-T/R MF OFDM A-PPDU Subfield 1816 1800 are identical to the definitions of the respective fields of the MF OFDM PPDU 1500 in FIG. 15, so description will be omitted.

[0118] The MF OFDM PPDU 1803 is not followed by another MF OFDM PPDU, so the additional PPDU field of the forward field 1813 of the MF OFDM PPDU 1803 header is set to 0, while the MF SC PPDUs 1801 and 1802 are followed by another MF OFDM PPDU, so the field the additional PPDU of the forward header fields 1807 and 1811 is set to 1.

[0119] Note that the additional PPDU field in the valid header included in the valid header field 1806 is set to 0, such that the MF OFDM A-PPDU 1800 will be received by the operating device as a valid LF OFDM PPDU.

[0120] In FIG. 18, all fields of the MF OFDM A-PPDU 1800 are transmitted using the standard 2.16 GHz channel bandwidth.

[0121] In addition, valid STF 1804, valid CEF 1805, valid header field 1806, forward header fields 1807, 1811, and 1813, forward STF 1808, AGC subfield 1815, and TRN-R/T subfield 1816 are transmitted by SC modulation, while forward CEF 1809 and data fields 1810, 1812, and 1814 are transmitted via OFDM modulation.

[0122] Accordingly, sampling rate conversion processing is performed at the boundary between the data field 1810 and the forward header field 1811, at the boundary between the forward header field 1811 and the data field 1812, at the boundary between the data field 1812 and the forward header field 1813, and at the boundary between forward field 1813 header and field 1814 data.

[0123] In FIG. 19 is a diagram showing an example of an MF OFDM A-PPDU 1900 transmitted in a variable channel bandwidth that is twice the standard B channel bandwidth according to the present invention.

[0124] MF OFDM A-PPDU 1900 is formed from three MF OFDM PPDUs 1901, 1902, and 1903. MF OFDM PPDUs are associated without IFS or preamble between them, and include forward header fields and data fields.

[0125] For example, the MF OFDM PPDU 1901 located at the beginning of the MF OFDM A-PPDU 1900 includes a forward header field 1907, a data field 1910, a valid STF 1904, a valid CEF 1905, a valid header field 1906, a forward STF 1908, and a forward CEF 1909.

[0126] The MF OFDM PPDU 1903 located at the end of the MF OFDM A-PPDU 1900 includes a forward header field 1913, a data field 1914, an optional AGC subfield 1915, and an optional TRN-R/T 1916.

[0127] The definitions of the current STF 1904, the current CEF 1905, the current header field 1906, the forward header fields 1907, 1911, and 1913, the forward STF 1908, the forward CEF 1909, the AGC subfield 1915, and the TRN-T/R subfield 1916 are identical to the definitions of the corresponding MF fields. OFDM PPDU 1600 in FIG. 16, so description will be omitted.

[0128] The MF OFDM PPDU 1903 is not followed by another MF OFDM PPDU, so the additional PPDU field of the forward field 1913 of the header of the MF OFDM PPDU 1903 is set to 0, while the MF SC PPDUs 1901 and 1902 are followed by other MF OFDM PPDUs 1902 and 1903, therefore, the supplementary PPDU field of the forward header fields 1907 and 1911 is set to 1.

[0129] Note that the field of the additional PPDU of the valid header included in the valid header field 1906 is set to 0, such that the MF OFDM A-PPDU 1900 will be received by the operating device as a valid LF OFDM PPDU.

[0130] In FIG. 19, valid STF 1904, valid CEF 1905, valid header field 1906, and forward header fields 1907, 1911, and 1913 are duplicated and transmitted in the standard B channel band (=2.16 GHz), each with a B/2 frequency offset that is a half-band standard B channel band (= 1.08 GHz). On the other hand, forward STF 1908, forward CEF 1909, data fields 1910, 1912, and 1914, AGC subfield 1915, and TRN-R/T subfield 1916 are transmitted in a variable channel band 2B, which is twice the standard B channel band (= 4.32 GHz).

[0131] In addition, valid STF 1904, valid CEF 1905, valid header field 1906, forward header fields 1907, 1911, and 1913, forward STF 1908, AGC subfield 1915, and TRN-R/T subfield 1916 are transmitted by SC modulation, while forward CEF 1909 and data fields 1910, 1912 and 1914 are transmitted via OFDM modulation.

[0132] Accordingly, sampling rate conversion processing is performed at the boundary between the data field 1910 and the forward header field 1911, at the boundary between the forward header field 1911 and the data field 1912, at the boundary between the data field 1912 and the forward header field 1913, and at the boundary between forward field 1913 header and field 1914 data.

[0133]

First Embodiment

In FIG. 20 is a diagram showing an example of an MF SC format of A-PPDU 2000 transmitted in a variable channel bandwidth that is twice the standard channel bandwidth according to the first embodiment of the present invention. MF SC A-PPDU 2000 is formed from three MF SC PPDUs 2001, 2002 and 2003. MF SC PPDUs are associated without IFS or preamble between them, and include forward header fields and data fields. The data fields include at least one of audio, video, and data.

[0134] For example, the MF SC PPDU 2001 located at the beginning of the MF SC A-PPDU 2000 includes a forward header field 2007, a data field 2010, a valid STF 2004, a valid CEF 2005, a valid header field 2006, a forward STF 2008, and forward CEF 2009. The 2003 MF SC PPDU located at the end of the MF SC A-PPDU 2000 includes a forward header field 2013, a data field 2014, an optional AGC subfield 2015, and an optional TRN-R/T subfield 2016.

[0135] The definitions of the Valid STF 2004, Valid CEF 2005, Valid Header Field 2006, Forward STF 2008, Forward CEF 2009, AGC Subfield 2015, and TRN-T/R 2016 Subfield are identical to the definitions of the corresponding MF SC A-PPDU 1400 fields in FIG. 14, so description will be omitted.

[0136] The difference between MF SC A-PPDU 1400 in FIG. 14 and MF SC A-PPDU 2000 in FIG. 20 will be described below.

[0137] FIG. 20, the forward header field 2001 MF SC PPDU located at the beginning is transmitted in the standard B channel band, and the forward fields 2011 and 2013 of the 2002 and 2003 MF SC PPDU header located in the second consecutive order and beyond are transmitted in the variable channel band 2B.

[0138] Thus, in FIG. 20, the forward header field 2007 is duplicated and each is transmitted in the standard B channel band (= 2.16 GHz), each with a B/2 frequency offset that is half the standard B channel band (= 1.08 GHz), but the forward fields 2011 and 2013 headers are transmitted in a variable 2B channel band, which is twice the standard B channel band (= 4.32 GHz). Accordingly, GI 2022a is added to the end of the final 2017 SC block of the forward 2007 header field, but GI 2023a is not added to the end of the final 2019 and 2020 SC blocks of the forward 2011 and 2013 header fields.

[0139] FIG. 21 is a diagram showing an example of a detailed configuration of an SC block in a forward header field according to the first embodiment of the present invention. In FIG. 21 illustrates the number of symbols N _GI GI when using the standard channel bandwidth, the number of symbols N _NLH of the forward header per SC block when using the standard channel bandwidth, the GI period T _GI , the forward header period T _NLH , and the ratio of the standard channel bandwidth and the variable channel bandwidth (= variable channel bandwidth/standard channel bandwidth) R _CB .

[0140] Accordingly, R _CB =1 is equivalent to the configuration of the SC block of the forward header field 2007 in FIG. 20, while R _CB =2 is equivalent to the SC block configuration of the forward header fields 2011 and 2013 in FIG. 20. R _CB =4 includes forward header 2100, duplicate forward header 2101, duplicate forward header 2102, and duplicate forward header 2103.

[0141] Referring to FIG. 21, it is required to maintain the GI period in T _GI regardless of R _CB , and keep the ratio between the GI period T _GI and the forward header period constant also with respect to the forward header field, in order to maintain the interference cancellation capabilities regarding the wave multipath delay and transmission efficiency, in the same way as in Fig. 12. However, unlike the case of the data field, the number of forward header bits is fixed, making it difficult to increase the number of characters in proportion to R _CB . Accordingly, the forward header period T _NLH can be kept constant by duplicating R _CB forward headers and placing them in a single SC. The GI configuration is the same as illustrated in FIG. 12. Thus, the relationship between the GI period and the forward header period in the SC block of the forward header field (= T _GI /T _NLH ) is kept constant.

[0142] In FIG. 22 is a diagram showing a configuration example of a MF SC A-PPDU transmission device 2200 according to the first embodiment of the present invention. The transmission device 2200 has a baseband signal processing unit 2201, a DAC 2202, an RF output stage 2203, and an antenna 2204. The baseband signal processing unit 2201 further includes a scrambler 2205, an LDPC encoder 2206, a modulator 2207, a duplication unit 2208, a symbol blocking unit 2209 and a GI insert block 2210.

[0143] The transmission device 2200 has the same configuration as the transmission device 300 except for the duplication block 2208, the character blocking block 2209, and the GI insertion block 2210, so description will be omitted.

[0144] The configuration in FIG. 23, for example, may be used when duplication block 2208 duplicates forward header 2100. FIG. 23 includes delay blocks 2301, adders 2302, and select block 2303, and can process up to R _CB =4. As shown in FIG. 21, the number of forward headers (R _CB -1) are duplicated in the SC block, and is associated with a time difference of N _NLH symbols, so the duplication block 2208 generates three duplicate forward headers 2101, 2102, and 2103 with delays of 1 × N _NLH symbols, 2×N _NLH symbols and 3×N _NLH symbols, relative to the forward header 2100, and the forward header 2100 that was provided as inputs are added to the duplicate forward headers 2101, 2102 and 2103.

[0145] The selection block 2303 skips the summed signals, in accordance with the input R _CB . For example, if R _CB =2, selector 2303 selects port 2 input signals. Port 2 signals are obtained by summing forward header 2100 and duplicated forward header 2101 delayed by N _NLH symbols, and are accordingly equivalent to the configuration of R _CB =2 in FIG. 21.

[0146] If R _CB =4, selector 2303 selects port 4 input signals. Port 4 signals are obtained by summing forward header 2100 symbols, duplicated forward header 2101 delayed by 1×N _NLH symbols, duplicated forward header 2102 delayed by 2×N _NLH symbols, and a duplicated forward header 2103 delayed by 3×N _NLH symbols, and are respectively equivalent to the configuration of R _CB =4 in FIG. 21.

[0147] The blocking block 2209 generates character blocks with R _CB × N _NLH counts for forward header fields 2007, 2011, and 2013, and generates R _CB × N _D counts for data fields 2010, 2012, and 2014 .

[0148] The GI inserter 2210 adds the GI of the R _CB × N _GI symbols to the beginning of the symbol block, thus generating the SC block.

[0149] Note that the order of modulator 2207 and block 2208 duplication may be reversed.

[0150] According to the present first embodiment, the forward header fields 2011 and 2013 and the data fields 2010, 2012 and 2014 are transmitted in the same channel band, except for the forward field 2007 of the 2001 MF SC PPDU header located at the beginning, so adding GI 2022a at the end of the final 2019 and 2020 SC blocks of the forward header fields 2011 and 2013 may be omitted, and also adding GI 2023a to the end of the 2018 and 2024 SC final blocks of data fields 2010 and 2012 may be omitted except for the data field 2014 of the MF SC PPDU 2003, located at the end. Note that GI 2023a may be added to the ends of data fields 2010, 2012 and 2014.

[0151] Accordingly, it is possible to improve the transmission efficiency compared to the MF SC A-PPDU 1400 illustrated in FIG. 14. In addition, sampling rate conversion processing becomes unnecessary at the boundary between the data field 2010 and the forward header field 2011, at the boundary between the forward header field 2011 and the data field 2012, at the boundary between the data field 2012 and the forward header field 2013, and at the boundary between the forward header field 2013 and the data field 2014, which can reduce power consumption.

[0152]

Second Embodiment

In FIG. 24 is a diagram showing an example of an MF OFDM A-PPDU 2400 transmitted in a standard channel band according to the second embodiment of the present invention. MF OFDM A-PPDU 2400 is formed from three MF OFDM PPDUs 2401, 2402, and 2403. MF OFDM PPDUs are associated without IFS or preamble between them, and include forward header fields and data fields.

[0153] For example, the MF OFDM PPDU 2401 located at the beginning of the MF OFDM A-PPDU 2400 includes a forward header field 2407, a data field 2410, a valid STF 2404, a valid CEF 2405, a valid header field 2406, a forward STF 2408, and a forward CEF 2409.

[0154] Note that in the case where data fields 2410, 2412, and 2414 are transmitted using SISO, forward STF 2408 and forward CEF 2409 may be omitted because the AGC level adjusted in the current STF 2404 and the channel estimation results obtained in current CEF 2405 may be used in data fields 2410, 2412 and 2414.

[0155] The MF OFDM PPDU 2403 located at the end of the MF OFDM A-PPDU 2400 includes a forward header field 2413, a data field 2414, an optional AGC subfield 2415, and an optional TRN-R/T subfield 2416.

[0156] The definitions of Valid STF 2404, Valid CEF 2405, Valid Header Field 2406, Valid Header Field 2406, Forward STF 2408, AGC Subfield 2415, and TRN-T/R Subfield 2416, MF OFDM A-PPDU 2400, are identical to the definitions of the corresponding MF fields OFDM PPDU 1800 in FIG. 18, so description will be omitted.

[0157] The difference between MF OFDM A-PPDU 1800 in FIG. 18 and MF OFDM A-PPDU 2400 in FIG. 24 will be described below.

[0158] In FIG. 24, the forward field 2407 of the MF OFDM PPDU header 2401 located at the beginning is transmitted by SC modulation, but the forward fields 2411 and 2413 of the MF OFDM PPDU header 2402 and 2403 located in the second consecutive order and beyond are transmitted by OFDM modulation.

[0159] Accordingly, the GI 2420a is added to the end of the final SC block 2417 of the forward header field 2407, but the addition of the GI 2420a to the ends of the final OFDM symbols 2418 and 2419 of the forward header fields 2411 and 2413 can be omitted.

[0160] In addition, sampling rate conversion processing may be omitted at the boundary between the data field 2410 and the forward header field 2411, between the forward header field 2411 and the data field 2412, between the data field 2412 and the forward header field 2413, and at the boundary between the forward header field 2413 and data field 2414 .

[0161] In FIG. 25 is a diagram showing an example of an MF OFDM A-PPDU 2500 transmitted in a variable channel bandwidth that is twice the standard channel bandwidth according to the second embodiment of the present invention.

[0162] MF OFDM A-PPDU 2500 is formed from three MF OFDM PPDUs 2501, 2502, and 2503. MF SC PPDUs are associated without IFS or preamble between them, and include forward header fields and data fields.

[0163] For example, MF OFDM PPDU 2501 located at the beginning of MF OFDM A-PPDU 2500 includes forward header field 2507, data field 2510, valid STF 2504, valid CEF 2505, valid header field 2506, forward STF 2508, and advanced CEF 2509.

[0164] The MF OFDM PPDU 2503 located at the end of the MF OFDM A-PPDU 2500 includes a forward header field 2513, a data field 2514, an optional AGC subfield 2515, and an optional TRN-R/T subfield 2516.

[0165] The definitions of valid STF 2504, valid CEF 2505, valid header field 2506, forward STF 2508, forward CEF 2509, data fields 2510, 2512, and 2514, AGC subfield 2515, and TRN-T/R subfield 2516 are identical to the definitions of the corresponding OFDM MF fields. PPDU 1900 in FIG. 19, so description will be omitted.

[0166] The difference between MF OFDM A-PPDU 1900 in FIG. 19 and MF OFDM A-PPDU 2500 in FIG. 25 will be described below.

[0167] FIG. 25, the forward field 2507 of the MF OFDM PPDU header 2501 located at the beginning is transmitted by SC modulation using the standard channel bandwidth, while the forward fields 2511 and 2513 of the MF OFDM PPDU header 2502 and 2503 located in the second consecutive order and beyond are transmitted by OFDM modulation using a variable 2B channel bandwidth, which is twice the standard B channel bandwidth.

[0168] Thus, as shown in FIG. 25, the forward header field 2507 is duplicated and each is transmitted by SC modulation using the standard B channel band (= 2.16 GHz), each with a B/2 frequency offset that is half the standard B channel band (= 1.08 GHz) , but forward header fields 2511 and 2513 are transmitted by OFDM modulation using a variable 2B channel band that is twice the standard B channel band (=4.32 GHz).

[0169] Accordingly, the GI 2520a is added to the end of the final SC block 2517 of the forward header field 2507, but the addition of the GI 2520a to the end of the final OFDM symbols 2518 and 2519 of the forward header fields 2511 and 2513 can be omitted.

[0170] In addition, sampling rate conversion processing may be omitted at the boundary between the data field 2510 and the forward header field 2511, between the forward header field 2511 and the data field 2512, between the data field 2512 and the forward header field 2513, and at the boundary between the forward header field 2513 and data field 2514 .

[0171] In FIG. 26 is a diagram showing an example of subcarrier mapping in forward header fields 2711 and 2713 according to the second embodiment of the present invention. In FIG. 26 illustrates the standard channel bandwidth B, the number of data subcarriers N _SNLH (number of forward header symbols) when using the standard channel bandwidth B, and the ratio of the standard channel bandwidth and the variable channel bandwidth (=variable channel bandwidth/standard channel bandwidth) R _CB .

[0172] Although for simplicity in FIG. 26 illustrates the data subcarriers, DC subcarrier, pilot subcarrier and guard band are also present in the actual MF OFDM PPDU.

[0173] In FIG. 26, the number of data subcarriers increases in proportion to R _CB in the MF OFDM PPDU, so the number of forward header symbols to be mapped to the data subcarriers also increases in proportion to R _CB . However, unlike the data field case, the number of forward header bits is fixed, which makes it difficult to increase the number of forward header symbols in proportion to R _CB . Accordingly, R _CB forward headers are duplicated and mapped to RC _B × N _SNLH data subcarriers.

[0174] FIG. 27 is a diagram showing a configuration example of a MF OFDM A-PPDU transmission apparatus 2700 according to the second embodiment of the present invention. The transmission apparatus 2700 has a baseband signal processing unit 2701, a DAC 2702, an RF output stage 2703, and an antenna 2704. The baseband signal processing unit 2701 further includes a scrambler 2705, an LDPC encoder 2706, a modulator 2707, a duplication unit 2708, a subcarrier mapping unit 2709 , block 2710 IFFT and block 2711 insert GI.

[0175] The transmission device 2700 has the same configuration as the transmission device 700 except for the duplication block 2708, the subcarrier mapping block 2709, the IFFT block 2710, and the GI insertion block 2711, so description will be omitted.

[0176] Block 2708 duplication duplicates forward header in the amount of R _CB .

[0177] The subcarrier mapper 2709 maps the forward header 2521 with R _CB × N _{SNLH counts} into data subcarriers with respect to forward header fields 2511 and 2513, and maps payload data 2522 with R _CB × N _D counts into data subcarriers with respect to data fields 2510, 2512 and 2514.

[0178] The IFFT block 2710 converts the forward header 2521 or payload data 2522 subjected to frequency domain subcarrier mapping into time domain signals by processing IFFT R _CB × 512 points.

[0179] The GI inserter 2010 copies the last R _CB × N _GI samples of the output signals from the IFFT block 2710 (GI 2523), and connects to the beginning of the IFFT output signals, thus generating OFDM symbols.

[0180] Note that the order of modulator 2707 and duplication block 2708 may be reversed.

[0181] According to the present second embodiment, the forward header fields and the data fields are transmitted in the same channel band using OFDM modulation, except for the MF OFDM PPDU located at the beginning, so adding GI 2523 to the end of the forward header field 2521 may be is eliminated, and the sampling rate conversion processing at the border between the forward header field and the data field becomes unnecessary, which can reduce the power consumption.

[0182]

Third Embodiment

In WiGig NG60, the SC period GI in the MF SC data field of the PPDU, or the OFDM symbol period GI in the MF OFDM PPDU data field, can be changed to short, normal, or long by changing the settings of the GI length field in the forward header illustrated in FIG. ten.

[0183] In a third embodiment of the present invention, a method for generating an SC block for a forward header field in case of a GI period change will be described with respect to the MF SC A-PPDU 2000 according to the first embodiment illustrated in FIG. twenty.

[0184] In the present embodiment, when the GI period in the MF SC A-PPDU 2000 is changed, the length GI of the forward field 2007 of the header of the MF SC A-PPDU 2001 located at the beginning is set to the desired value.

[0185] The GI length change applies to the data field in the current MF SC PPDU, but in the third embodiment of the present invention, this also applies to all fields from the data field 2010 of the MF SC PPDU 2001 located at the beginning of the MF SC A-PPDU 2000 onwards . Thus, the GI period change also applies to the (2011, 2013) MF SC PPDU (2002, 2003) forward header fields in second consecutive order and beyond.

[0186] Accordingly, the GI length fields of the 2011 and 2013 forward fields of the 2002 and 2003 MF SC PPDU header located in the second sequential order and beyond are set to the same value as the GI length field of the forward 2007 field of the 2001 MF SC PPDU header located at the beginning.

[0187] Note that the period GI of the forward field 2007 of the 2001 MF SC PPDU header located at the beginning is normal regardless of the settings of the GI length field, and is unchanged.

[0188] The method for generating the SC block of the forward header field in the MF SC PPDU arranged in the second consecutive order onwards in the case where the GI period has been changed to short GI will be described below with reference to FIG. 28. Here, an example will be described where the size of the forward header is 64 bits in the case where the transmission is in a variable channel bandwidth R _CB =2. Also, the number of characters of the short GI is a number that is N _S characters less than the normal GI.

[0189]

Stage S2801

The 64-bit forward header is scrambled to give 64 bits of scrambler output signals.

[0190]

Step S2802

440 (= 504-64) bits of zeros are added to the end of 64 bits of the scrambler output signals, and an LDPC codeword that has a code length of 672 bits is obtained by LDPC encoding at a code rate of 3/4.

[0191]

Step S2803

440 - N _S /R _CB bits from bits 65 to 504, and eight bits from bits 665 to 672 are removed from the LDPC codeword, resulting in a first bit sequence of 224+N _S /R _CB .

[0192]

Step S2804

440 - N _S /R _CB bits from bits 65 to 504, and eight bits from bits 657 to 664 are removed from the LDPC codeword, resulting in a spare bit sequence of 224+N _S /R _CB . Additionally, XOR is calculated for the PN (pseudo-random noise) sequence obtained by initializing the shift register of the scrambler used in step S2801 to all ones and the reserved bit sequence, resulting in a second bit sequence 224+N _S /R _CB .

[0193]

Step S2805

The first bit sequence and the second bit sequence are concatenated, resulting in a third bit sequence 448+N _S .

[0194]

Step S2806

The third bit sequence is concatenated R _CB , resulting in a fourth bit sequence R _CB × (448+N _s ) bits.

[0195]

Stage S2807

The fourth bit sequence is modulated with π/2-BPSK, resulting in a symbol block of R _CB × (448+N _s ) symbols.

[0196]

Step S2808

The GI of their R _CB × (N _GI - N _S ) characters is added to the beginning of the character block, resulting in an SC block of R _CB × (N _GI +448) characters.

[0197] Note that the order of step S2807 and step S2808 may be reversed.

[0198] Note that in the case of changing the GI period to a long GI, N _S in steps S2801 to S2808 should be read as -N _L because a long GI has N _L more characters than a normal GI.

[0199] According to the third embodiment of the present invention, the GI period and the forward header period in the SC block can be changed in accordance with the settings of the GI length field of the forward header, which allows flexible processing of transmission path situations.

[0200] Various forms of embodiments according to the present invention include the following.

[0201] The transmission device according to the first embodiment includes a duplication unit, which, of the first Physical Layer Convergence Protocol Data Units (PPDUs) including a valid STF, a valid CEF, a valid header field, a forward STF, and a forward CEF, one or more forward header fields, including one or more forward headers, and one or more data fields, including one or more payload data, duplicates, in the number (N - 1) (where N is an integer greater than or equal to 2) in the frequency axis direction, the effective STF, the effective CEF, the effective header field, and the forward header field located at the beginning, serving as the first PPDU transmitted in the standard channel bandwidth; a guard interval inserter that adds a guard interval to each of the first PPDU transmitted in the standard channel band, the duplicated first PPDU transmitted in the standard channel band, the forward STF, the forward CEF, and one or more data fields serving as of the first PPDUs , a first PPDU transmitted in a variable channel bandwidth that is N times the standard channel bandwidth, and a forward header field and one or more data fields transmitted in a variable channel bandwidth from second PPDUs including one or more forward header fields and one or more data fields, and outputs as an aggregated Physical Layer Convergence Protocol (A-PPDU) data unit; and a wireless unit that transmits the A-PPDU.

[0202] The transmission device according to the second embodiment is the transmission device according to the first embodiment, where in the case where the wireless unit transmits the first PPDU and the second PPDU via a single carrier, one or more fields of the forward header of the second PPDU include one or more single blocks carriers, and the duplication block duplicates forward headers in the amount of (N - 1) in the direction of the time axis, for each of the blocks of single carriers in one or more fields of the forward header of the second PPDU.

[0203] The transmission device according to the third embodiment is the transmission device according to the second embodiment, where one or more fields of the forward header of the first PPDU transmitted in the variable channel band include one or more single carrier blocks, and the guard interval inserter further adds a guard interval of N _GI symbols (where N _GI is an integer greater than or equal to 1) to a forward header of N _NLH symbols (where N _NLH is an integer greater than or equal to 1), for each of the single carrier blocks of one or more fields forward header in the first PPDU transmitted in the variable channel bandwidth, and adds a guard interval of (N _GI +M) × N symbols (where M is an integer greater than or equal to 0) to the forward header of N _NLH - M symbols, and adds a guard interval of (N _GI - M) × N symbols to a forward header of N _NLH +M symbols, for each of the single carrier blocks of the forward header field in the second PPDU.

[0204] The transmission device according to the fourth embodiment is the transmission device according to the first embodiment, where in the case of transmitting the second PPDU via multiple carriers, the wireless unit transmits, via a single carrier, one or more forward header fields of the first PPDU transmitted in a standard channel band, and transmits, via multiple carriers, one or more data fields of the first PPDU transmitted in the variable channel bandwidth.

[0205] The transmission device according to the fifth embodiment is the transmission device according to the fourth embodiment, where the duplication unit duplicates the forward header of N _SNLH symbols in the number of N - 1 in each of one or more fields of the forward header of the second PPDU, and the wireless block transmits the forward headers , mapped to N × N _SNLH data subcarriers, and N - 1 duplicated forward headers.

[0206] The transmission method according to the sixth embodiment includes redundancy, of first Physical Layer Convergence Protocol Data Units (PPDUs) including a valid STF, a valid CEF, a valid header field, a forward STF, and a forward CEF, one or more forward fields. header, including one or more forward headers, and one or more data fields, including one or more payload data, in the amount of (N - 1) (where N is an integer greater than or equal to 2) in the direction of the axis a frequency, an effective STF, an effective CEF, an effective header field, and a forward header field located at the beginning, serving as the first PPDU transmitted in the standard channel band; adding a guard interval to each of the first PPDU transmitted in the standard channel band, the duplicated first PPDU transmitted in the standard channel band, the forward STF, the forward CEF, and one or more data fields serving as, of the first PPDUs, the first PPDU transmitted in the a variable channel bandwidth that is N times the standard channel bandwidth, and a forward header field and one or more data fields transmitted in a variable channel bandwidth from the second PPDUs including one or more forward header fields and one or more data fields, and outputting a Physical Layer Convergence Protocol (A-PPDU) as an aggregated data unit; and transmission of the A-PPDU.

[0207] The transmission method according to the seventh embodiment is the transmission method according to the sixth embodiment, where in the case where the wireless unit transmits the first PPDU and the second PPDU via a single carrier, one or more fields of the forward header of the second PPDU include one or more single blocks carriers, and the duplication block further duplicates forward headers in the amount of (N - 1) in the direction of the time axis, for each of the single carrier blocks in one or more fields of the forward header of the second PPDU.

[0208] The transmission method according to the eighth embodiment is the transmission method according to the seventh embodiment, where one or more forward header fields of the first PPDU transmitted in a variable channel band include one or more single carrier blocks, and further, a guard interval of N _GI characters (where N _GI is an integer greater than or equal to 1) is added to the forward header of N _NLH characters (where N _NLH is an integer greater than or equal to 1), for each of the single carrier blocks of one or more forward header fields in the first PPDU transmitted in the variable channel bandwidth, and a guard interval of (N _GI +M) × N symbols (where M is an integer greater than or equal to 0) is added to the forward header of N _NLH - M symbols, and a guard interval of ( N _GI - M) × N symbols are added to the forward header of N _NLH +M symbols, for each of the single carrier blocks of the forward header field in the second PPDU.

[0209] The transmission method according to the ninth embodiment is the transmission method according to the sixth embodiment, where in the case of transmitting the second PPDU via multiple carriers, one or more fields of the forward header of the first PPDU transmitted in the standard channel band are transmitted via a single carrier, and one or more data fields of the first PPDU transmitted in the variable channel bandwidth are transmitted over multiple carriers.

[0210] The transmission method according to the tenth embodiment is the transmission method according to the ninth embodiment, where the duplication block duplicates the forward header of N _SNLH symbols in the number of N - 1 in each of one or more fields of the forward header of the second PPDU, and the wireless block transmits the forward headers , mapped to N × N _SNLH data subcarriers, and N - 1 duplicated forward headers.

[0211] Although various embodiments have been described above with reference to the drawings, the present invention is not limited to these examples. Obviously, a person skilled in the art can offer various changes and modifications within the scope of the claims, which, of course, belong to the technical scope of the present invention. The various components in the above embodiments may optionally be combined without departing from the spirit of the invention.

[0212] Although configuration examples of the present invention using hardware have been described in the above-described embodiments, the present invention can be implemented by software also in conjunction with hardware.

[0213] The functional blocks used in the description of the above embodiments are typically implemented as an LSI, that is, an integrated circuit having input pins and output pins. They may be individually formed on a single chip, or some or all of them may be included on a single chip. In addition, although the description has been given in relation to LSI, there are other names such as IC, system LSI, super-LSI and ultra-LSI, depending on the degree of integration.

[0214] The circuit integration method is not limited to LSI, and dedicated circuits or general purpose processors may be used to implement it. An FPGA (Field Programmable Gate Array) can be used, which can be programmed after the LSI is manufactured, or a reconfigurable processor, where circuit cell connections and settings in the LSI can be reconfigured.

[0215] Additionally, in the event that integrated circuit technology emerges to replace LSI due to the development of semiconductor technology or a separate technology derived from it, such technology can naturally be used to integrate functional blocks. Perhaps, for example, the use of biotechnology.

INDUSTRIAL APPLICATION

[0216] The present invention is applicable to a method for configuring and transmitting aggregated PPDUs (Physical Layer Convergence Protocol Data Units) in a wireless communication system, which is a cellular phone, a smartphone, a tablet terminal, and a television terminal that transmits and receives moving images (video), still images (photos), text data, audio data, and control data.

LIST OF REFERENCES

[0217] 300 LF SC PPDU Transmitter

301, 701, 2201, 2701 baseband signal processor

302, 702, 2202, 2702 DAC

303, 703, 2203, 2703 RF output stage

304, 704, 2204, 2704 antenna

305, 705, 2205, 2705 scrambler

306, 706, 2206, 2706 LDPC encoder

307, 707, 2207, 2707 modulator

308, 2209 character blocking block

309, 710, 2210, 2711 GI insert block

700 LF OFDM PPDU Transmitter

708, 2709 subcarrier mapper

709, 2710 IFFT block

2200 MF SC A-PPDU Transmitter

2208, 2708 duplication unit

2700 MF OFDM A-PPDU Transmitter

Statement 1. A transmission device, comprising:

a duplication unit that, from the first Physical Layer Convergence Protocol Data Units (PPDUs) including a valid STF, a valid CEF, a valid header field, a forward STF, and a forward CEF, one or more forward header fields including one or more forward headers, and one or more data fields including one or more payload data duplicates, in the amount of (N - 1) (where N is an integer greater than or equal to 2) in the direction of the frequency axis, the effective STF, the effective CEF , a valid header field and a forward header field located at the beginning, serving as the first PPDU transmitted in the standard channel bandwidth;

guard interval insertion module, which

adds a guard interval to each of

the first PPDU transmitted in the standard channel bandwidth,

the duplicated first PPDU transmitted in the standard channel bandwidth,

a forward STF, a forward CEF, and one or more data fields serving as, of the first PPDUs, the first PPDU transmitted in a variable channel bandwidth that is N times the standard channel bandwidth, and

forward header fields and one or more variable bandwidth data fields from the second PPDUs including one or more forward header fields and one or more data fields, and

outputs as an aggregated physical layer convergence protocol data unit (A-PPDU); and

the wireless module that transmits the A-PPDU.

Statement 2. The transmission device according to Statement 1,

wherein, in the case where the wireless module transmits the first PPDU and the second PPDU via a single carrier, one or more fields of the forward header of the second PPDU includes one or more single carrier blocks, and

whereby the duplication module duplicates (N - 1) forward headers in the direction of the time axis, for each of the single carrier blocks, in one or more fields of the second PPDU forward header.

Statement 3. The transmission device according to Statement 2,

wherein one or more fields of the forward header of the first PPDU transmitted in the variable channel bandwidth include one or more single carrier blocks, and

at the same time, the guard interval insertion module additionally

adds a guard interval of N _GI symbols (where N _GI is an integer greater than or equal to 1) to a forward header of N _NLH symbols (where N _NLH is an integer greater than or equal to 1), for each of the single carrier blocks of one or more forward header fields in the first PPDU transmitted in the variable channel bandwidth, and

adds a guard interval of (N _GI + M) × N characters (where M is an integer greater than or equal to 0) to the forward header of N _NLH - M characters, and adds a guard interval of (N _GI - M) × N characters to forward header of N _NLH + M symbols, for each of the single carrier blocks of the forward header field in the second PPDU.

Statement 4: The transmission device according to Statement 1, in which, in the case of transmitting the second PPDU via multiple carriers, the wireless module

transmits, via a single carrier, one or more forward header fields of the first PPDU transmitted in the standard channel band, and

transmits, via multiple carriers, one or more data fields of the first PPDU transmitted in the variable channel bandwidth.

Statement 5. A transmission device according to Statement 4, in which

the duplication module duplicates the forward header of N _SNLH symbols in the amount of N - 1 in each of one or more fields of the forward header of the second PPDU, and

the wireless module transmits forward headers mapped to N × N _SNLH data subcarriers and N - 1 duplicate forward headers.

Statement 6. A transmission method, comprising the steps of:

duplicate, from the first Physical Layer Convergence Protocol Data Units (PPDUs) including a valid STF, a valid CEF, a valid header field, a forward STF, and a forward CEF, one or more forward header fields including one or more forward headers, and one or more data fields including one or more payload data, in the amount of (N - 1) (where N is an integer greater than or equal to 2) in the direction of the frequency axis, the effective STF, the effective CEF, the effective header field, and a forward header field located at the beginning, serving as the first PPDU transmitted in the standard channel band;

add a guard interval to each of

the first PPDU transmitted in the standard channel bandwidth,

the duplicated first PPDU transmitted in the standard channel bandwidth,

a forward STF, a forward CEF, and one or more data fields serving as, of the first PPDUs, the first PPDU transmitted in a variable channel bandwidth that is N times the standard channel bandwidth, and

forward header fields and one or more data fields transmitted in a variable channel bandwidth from the second PPDU, including one or more forward header fields and one or more data fields,

and output as an aggregated Physical Layer Convergence Protocol Data Unit (A-PPDU); and

transmit A-PPDU.

Clause 7. Method of transmission according to Clause 6,

wherein, in the case where the wireless module transmits the first PPDU and the second PPDU via a single carrier, one or more fields of the forward header of the second PPDU includes one or more single carrier blocks, and

wherein the duplication module further duplicates forward headers in the amount of (N - 1) in the direction of the time axis, for each of the single carrier blocks in one or more fields of the forward header of the second PPDU.

Clause 8. Method of transmission according to Clause 7,

in which one or more fields of the forward header of the first PPDU transmitted in a variable channel bandwidth include one or more blocks of single carriers,

and additionally,

a guard interval of N _GI symbols (where N _GI is an integer greater than or equal to 1) is added to a forward header of N _NLH symbols (where N _NLH is an integer greater than or equal to 1), for each of the single carrier blocks of one or more forward header fields in the first PPDU transmitted in the variable channel bandwidth, and

a guard interval of (N _GI + M) × N characters (where M is an integer greater than or equal to 0) is added to the forward header of N _NLH - M characters, and a guard interval of (N _GI - M) × N characters is added to forward header of N _NLH + M symbols, for each of the single carrier blocks of the forward header field in the second PPDU.

Clause 9. The transmission method according to Clause 6, in which, in the case of transmitting the second PPDU via multiple carriers,

one or more fields of the forward header of the first PPDU transmitted in the standard channel band are transmitted on a single carrier, and

one or more data fields of the first PPDU transmitted in a variable channel bandwidth are transmitted over multiple carriers.

Clause 10. The method of transmission under Clause 9, in which

the duplication module duplicates the forward header of N _SNLH symbols in the amount of N - 1 in each of one or more fields of the forward header of the second PPDU, and

wherein the wireless module transmits forward headers mapped to data subcarriers of N × N _SNLH , and duplicate forward headers of N - 1.

Claims (44)

1. A transmission device, comprising: a signal processing circuit configured to generate a Physical Layer Convergence Protocol Data Unit (A-PPDU) including a first Physical Layer Convergence Protocol Data Unit (PPDU) and a second PPDU(s), wherein the first PPDU comprises the first part and the second part, while the first part of the first PPDU includes a set of a valid STF, a valid CEF, a valid header field, and a forward header field that is transmitted using the standard channel bandwidth, and another set of valid STF, valid CEF, valid header field and forward header field, which is duplicated in the direction of the frequency axis and transmitted using said standard channel bandwidth, the second part of the first PPDU includes a forward STF, a forward CEF and a data field that are transmitted using a variable channel bandwidth that is N times the standard channel bandwidth (where N is an integer greater than or equal to 2), each of the second PPDU(s) includes one or more forward header fields and one or more data fields that are transmitted using said variable channel bandwidth, and a guard interval is added to each of the first part of the first PPDU, the second part of the first PPDU and the second PPDU(s); and a wireless unit configured to transmit the A-PPDU. 2. The transmission device according to claim 1, while in the case where the first PPDU and the second PPDU(s) are transmitted via a single carrier, said one or more forward header fields of the second PPDU(s) include one or more single carrier blocks, and (N - 1) forward headers are duplicated along the time axis for each of the single carrier blocks in said one or more forward header fields of the second PPDU(s). 3. The transmission device according to claim 2, while one or more forward header fields of the first PPDU transmitted in a variable channel bandwidth include one or more single carrier blocks, a guard interval of N _GI symbols (where N _GI is an integer greater than or equal to 1) is inserted in a forward header of N _NLH symbols (where N _NLH is an integer greater than or equal to 1) for each of the single carrier blocks of one or more fields a forward header in the first PPDU transmitted using a variable channel bandwidth, and a guard interval of (N _GI + M) × N characters (where M is an integer greater than or equal to 0) is added to the forward header of N _NLH - M characters, and a guard interval of (N _GI - M) × N characters is added to a forward header of N _NLH + M symbols, for each of the single carrier blocks of the forward header field in the second PPDU(s). 4. The transmission device according to claim 1, wherein, in the case of transmission of the second PPDU-block(s) via multiple carriers, the forward header field in the first part of the first PPDU is transmitted on a single carrier using the standard channel bandwidth, and said one or more data fields in the second PPDU(s) are transmitted over multiple carriers using a variable channel bandwidth. 5. The transmission device according to claim 4, while a forward header of N _SNLH symbols in the amount of N - 1 is duplicated in each of the mentioned one or more forward header fields of the second PPDU(s), forward headers mapped to data subcarriers of N × N _SNLH , and duplicate forward headers of N - 1 are transmitted by the transmission device. 6. A transmission method, comprising the steps of: an aggregated Physical Layer Convergence Protocol Data Unit (A-PPDU) is formed, including a first Physical Layer Convergence Protocol Data Unit (PPDU) and a second PPDU unit(s), wherein the first PPDU contains a first part and a second part, wherein the first part of the first PPDU includes a set of a valid STF, a valid CEF, a valid header field, and a forward header field that is transmitted using the standard channel bandwidth, and another set of valid STF, valid CEF, valid header field and forward header field, which is duplicated in the direction of the frequency axis and transmitted using said standard channel bandwidth, the second part of the first PPDU includes a forward STF, a forward CEF, and a data field that are transmitted using a variable channel bandwidth that is N greater than said standard channel bandwidth (where N is an integer greater than or equal to 2), each of the second PPDU(s) includes one or more forward header fields and one or more data fields that are transmitted using said variable channel bandwidth, and a guard interval is added to each of the first part of the first PPDU, the second part of the first PPDU and the second PPDU(s); and transmit A-PPDU. 7. The transmission method according to claim 6, wherein in the case where the first PPDU and the second PPDU(s) are transmitted via a single carrier, said one or more forward header fields of the second PPDU(s) include one or more single carrier blocks, and (N - 1) forward headers are duplicated along the time axis for each of the single carrier blocks in said one or more forward header fields of the second PPDU(s). 8. The transmission method according to claim 7, wherein one or more forward header fields of the first PPDU transmitted in a variable channel bandwidth include one or more single carrier blocks, a guard interval of N _GI symbols (where N _GI is an integer greater than or equal to 1) is inserted in a forward header of N _NLH symbols (where N _NLH is an integer greater than or equal to 1) for each of the single carrier blocks of one or more fields a forward header in the first PPDU transmitted using a variable channel bandwidth, and a guard interval of (N _GI + M) × N characters (where M is an integer greater than or equal to 0) is added to the forward header of N _NLH - M characters, and a guard interval of (N _GI - M) × N characters is added to forward header of N _NLH + M symbols for each of the forward header field single carrier blocks in the second PPDU(s). 9. The transmission method according to claim 6, wherein, in the case of transmitting the second PPDU(s) via multiple carriers, the forward header field in the first part of the first PPDU is transmitted on a single carrier using the standard channel bandwidth, and said one or more data fields in the second PPDU(s) are transmitted over multiple carriers using a variable channel bandwidth. 10. The transmission method according to claim 9, wherein a forward header of N _SNLH symbols in the amount of N - 1 is duplicated in each of the mentioned one or more forward header fields of the second PPDU(s), forward headers mapped to data subcarriers of N × N _SNLH and duplicate forward headers of N - 1 are transmitted.

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