Encoding and Modulation in IEEE 802.11ay for SC.PHY Transmission
This presentation delves into the encoding and modulation techniques for SC.PHY MU-MIMO transmission in IEEE 802.11ay standard, building upon specifications from the 11ad standard. It outlines the proposed Header-B format, including scrambler seed per user, header size limitations, and other parameters. The encoding steps for EDMG Header-B are detailed, covering data scrambling, encoding, codeword generation, and bit scrambling. The resulting codeword length, scrambling, and XOR operations are also explained.
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July 2016 doc.: IEEE 802.11-16/0989r0 EDMG Header-B Encoding and Modulation for SC PHY in 11ay Date: 2016-07-25 Authors: Name Affiliations Address Phone email +7 (831) 2969444 Turgeneva 30, Nizhny Novgorod, 603024, Russia artyom.lomayev@intel.com Artyom Lomayev Intel yaroslav.p.gagiev@intel.com Yaroslav Gagiev Intel alexander.maltsev@intel.com Alexander Maltsev Intel miki.genossar@intel.com Miki Genossar Intel carlos.cordeiro@intel.com Carlos Cordeiro Intel Submission Slide 1 Intel Corporation
July 2016 doc.: IEEE 802.11-16/0989r0 Introduction This presentation defines the EDMG Header-B encoding and modulation for SC PHY MU-MIMO transmission, [1]. The proposed method is based on the encoding and modulation defined for the legacy SC PHY in 11ad standard, [2]. Submission Slide 2 Intel Corporation
July 2016 doc.: IEEE 802.11-16/0989r0 EDMG Header-B Format Proposed Header-B bit content: The exact bit content of Header-B is not defined yet; It is proposed: First 7 bits (b1, b2, , b7) define scrambler seed per user (or STA); The total header size it is proposed to limit by 64 bits; The rest of bits may define the PSDU length in bytes per user; EDMG-MCS per user; Other parameters; Submission Slide 3 Intel Corporation
July 2016 doc.: IEEE 802.11-16/0989r0 EDMG Header-B Encoding EDMG Header-B encoding steps, [2]: Data scrambling: b = (b1, b2, , b64) input bits of Header-B; s = (01, 02, 07, s1, s2, , s57) s1, s2, , s57 are first 57 bits at the output of scrambler with initial seed value (b1, b2, , b7); bs = b s; - defines bitwise XOR of two vectors; Data encoding: c = (bs1, bs2, , bs64, 01, 02, , 0440, p1, p2, , p168) LDPC codeword; HcT = 0 encoding, H is a 168 x 672 LDPC parity check matrix; c1 = (bs1, bs2, , bs64, p1, p2, , p160) codeword #1, shortening of zero bits, puncturing of tail parity bits; c2 = (bs1, bs2, , bs64, p1, p2, , p152, p161, p162, , p168) codeword #2, shortening of zero bits, puncturing of middle parity bits; Submission Slide 4 Intel Corporation
July 2016 doc.: IEEE 802.11-16/0989r0 EDMG Header-B Encoding (Cont d) EDMG Header-B encoding steps (cont d): Resulting codeword: c = (c1, c2) codeword of length 448 bits; Codeword scrambling: s = (01, 02, , 0224, s1, s2, , s224) - s1, s2, , s224 are first 224 bits at the output of scrambler with initial seed value (11, 12, , 17); cs = c s - bitwise XOR of two vectors; Submission Slide 5 Intel Corporation
July 2016 doc.: IEEE 802.11-16/0989r0 Header-B MU-MIMO Transmission Access Point (AP) transmits one stream per user: NSTS total number of space-time streams; i space-time stream index, i=1:NSTS; During MU-MIMO transmission each user (or STA) has its own scrambler initial seed value bi = (b1, b2, , b7)i depending on the space-time stream index i ; If each user has single stream, then the initial seed selection guarantees that each user will have its own unique code vector csi; Submission Slide 6 Intel Corporation
July 2016 doc.: IEEE 802.11-16/0989r0 Header-B MU-MIMO Transmission (Cont d) If AP transmits N streams per user: AP creates more than one codeword per user transmitted in different space-time streams; N codewords for N streams are obtained by the bitwise XOR operation applied to the original codeword: cs1 = c s1, cs2 = c s2, csN = c sN; c original code vector introduced above; s1 = (01, 02, , 0224, s1, s2, , s224) scrambler vector for stream #1; s2 = (s225, s226, , s672) scrambler vector for stream #2; sN = (s(N-1)*448-224+1, s(N-1)*448-224+2, , sN*448-224) scrambler vector for stream #N; All bits: s1, s2, , sN*448-224 are obtained from the output of scrambler with initial seed (11, 12, , 17); Slide 7 Submission Intel Corporation
July 2016 doc.: IEEE 802.11-16/0989r0 Header-B Modulation & Symbol Blocking Header-B modulation: Each codeword csi for space-time stream with index i is modulated using /2-BPSK modulation; It provides a SC symbol block blki of length 448 chips for the i-th stream; Each block blki is prepended with Guard Interval (GI) which is a Golay Gai64 sequence of length 64 chips; {Gai64, i=1:NSTS} comprises the set of mutually orthogonal Ga Golay sequences; This provides a regular SC symbol blocking for the i-th space-time stream as follows: [Gai64, blki]; Submission Slide 8 Intel Corporation
July 2016 doc.: IEEE 802.11-16/0989r0 Symbol Blocking for Channel Bonding Symbol blocking in case of channel bonding: NCB = 2, 3, 4 channel bonding factor; NGI CB = 64 * NCB = 128, 192, 256 Guard Interval (GI) length in case of channel bonding; The symbol block blki is repeated NCB number of times to support different channel bonding factors: NCB = 2: [Gai128, blki, blki]; NCB = 3: [Gai192, blki, blki, blki]; NCB = 4: [Gai256, blki, blki, blki, blki]; Submission Slide 9 Intel Corporation
July 2016 doc.: IEEE 802.11-16/0989r0 Conclusions This presentation defines the EDMG Header-B encoding and modulation for SC PHY. Submission Slide 10 Intel Corporation
July 2016 doc.: IEEE 802.11-16/0989r0 Straw Poll #1 Would you agree to insert the following in the SFD: The 11ay specification shall define first 7 bits of EDMG-Header-B for scrambler seed value and define the total number of bits to 64 as in the legacy 11ad header. Submission Slide 11 Intel Corporation
July 2016 doc.: IEEE 802.11-16/0989r0 Straw Poll #2 Would you agree to insert the following in the SFD: The 11ay specification shall define encoding and modulation method for EDMG-Header-B as described in the 11-16-0989-00- 00ay. Submission Slide 12 Intel Corporation
July 2016 doc.: IEEE 802.11-16/0989r0 References 1. 2. 11-15-1358-04-00ay-specification-framework-for-tgay Draft P802.11REVmc_D5.4 Submission Slide 13 Intel Corporation
