IEEE 802.11ad and 11ay: OFDM Modulation Types Overview
Explore the design of MCS set for OFDM PHY in IEEE 802.11ad and the proposed MCS set for 11ay in July 2017 documentation. Learn about the modulation types including SQPSK, QPSK, 16QAM, and 64QAM, their mappings, modulation steps, and more. Dive into the intricacies of OFDM modulation in the 11ad standard and the advancements for 11ay.
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July 2017 doc.: IEEE 802.11-17/0908r0 MCS Set for OFDM PHY in 11ay Date: 2017-07-10 Authors: Name Affiliations Address Phone email +7 (831) 2969444 Turgeneva 30, Nizhny Novgorod, 603024, Russia artyom.lomayev@intel.com Artyom Lomayev Intel alexander.kostin@intel.com Alexander Kostin Intel alexander.maltsev@intel.com Alexander Maltsev Intel miki.genossar@intel.com Miki Genossar Intel claudio.da.silva@intel.com Claudio da Silva Intel carlos.cordeiro@intel.com Carlos Cordeiro Intel Submission Slide 1 Intel Corporation
July 2017 doc.: IEEE 802.11-17/0908r0 Introduction This presentation overviews the design of MCS set for OFDM PHY in 11ad and proposes MCS set for 11ay. Submission Slide 2 Intel Corporation
July 2017 doc.: IEEE 802.11-17/0908r0 OFDM Modulation Types in 11ad The IEEE 802.11ad standard defines 4 modulation types including SQPSK, QPSK, 16QAM and 64QAM, [1]. These modulations can be divided into two subtypes: Dual carrier modulations: Spread (S)QPSK and QPSK - utilize two subcarriers in the OFDM signal spectrum; SQPSK is in fact a repetition x2 of QPSK point with data rate equivalent to BPSK, it extracts frequency diversity gain; QPSK is a repetition x2 of 16QAM point with the additional coding, it extracts both frequency diversity and coding gain; it provides data rate equivalent to regular QPSK modulation; Regular modulations: 16QAM and 64QAM normal mapping, there is no repetition in the signal spectrum; To extract frequency diversity, the interleaver spreads out the LDPC CW over the entire signal bandwidth; Submission Slide 3 Intel Corporation
July 2017 doc.: IEEE 802.11-17/0908r0 OFDM Modulation Types in 11ad (Cont d) SQPSK modulation mapping is shown in figure below: Two coded bits (c2k, c2k+1) are modulated to two subcarriers (dk, dP(k)); The modulation is performed in 2 steps: First, two BPSK points are modulated as x2k = (2*c2k-1), x2k+1 = (2*c2k+1-1); Second, two QPSK points are modulated by multiplication on matrix Q; P(k) = 168 + k for Static Tone Pairing (STP) mode and can be permutation of indexes for Dynamic Tone Pairing (DTP) mode in the range [168, 335]; dk dP(k) 1 d j x 1 k = 2 k 1 d j 2 x ( ) k + P 2 1 k = Q Data subcarrier k Data subcarrier P(k) Submission Slide 4 Intel Corporation
July 2017 doc.: IEEE 802.11-17/0908r0 OFDM Modulation Types in 11ad (Cont d) QPSK modulation mapping is shown in figure below: Four coded bits (c4k, c4k+1, c4k+2, c4k+3) are modulated to two subcarriers (dk, dP(k)); The modulation is performed in 2 steps: First, two QPSK points are modulated as x2k = ((2*c4k-1)+j(2*c4k+2-1))/ 2; x2k+1 = ((2*c4k+1-1)+j(2*c4k+3-1))/ 2; Second, two 16QAM points are modulated by multiplication on matrix Q; In essence, SQPSK and QPSK represent normal BPSK and QPSK modulations accordingly with some precoding by Q matrix of size 2x2; dk dP(k) 1 2 d x 1 k = 2 k 2 1 d 5 x ( ) k + P 2 1 k = Q Data subcarrier k Data subcarrier P(k) Submission Slide 5 Intel Corporation
July 2017 doc.: IEEE 802.11-17/0908r0 OFDM Modulation Types in 11ad (Cont d) 16QAM uses regular Gray coded constellation and maps single QAM point to single OFDM subcarrier: 336*4 = 672*2 two CWs belong to OFDM symbol; Interleaver spreads out single LDPC CW over the entire OFDM signal bandwidth as shown in figure below; 4 bits 16QAM modulation 1st CW 2nd CW . . . . . . OFDM symbol spectrum Tones Submission Slide 6 Intel Corporation
July 2017 doc.: IEEE 802.11-17/0908r0 OFDM Modulation Types in 11ad (Cont d) 64QAM uses regular Gray coded constellation and maps single QAM point to single OFDM subcarrier: 336*6 = 672*3 three CWs belong to OFDM symbol; Interleaver scheme is shown below; 6 bits 64QAM modulation 1st CW 2nd CW 3rd CW . . . . . . . . . OFDM symbol spectrum Tones Submission Slide 7 Intel Corporation
July 2017 doc.: IEEE 802.11-17/0908r0 MCS Set Defined in 11ad MCS set defined for OFDM in 11ad is provided in Table 1 below. Table 1: MCS set defined for OFDM in 11ad. MCS Modulation Code rate Data rate, Mbps 13 SQPSK 693.00 14 SQPSK 5/8 866.25 15 QPSK 1386.00 16 QPSK 5/8 1732.50 17 QPSK 2079.00 18 16QAM 2772.00 19 16QAM 5/8 3465.00 20 16QAM 4158.00 21 16QAM 13/16 4504.50 22 64QAM 5/8 5197.50 23 64QAM 6237.00 24 64QAM 13/16 6756.75 Submission Slide 8 Intel Corporation
July 2017 doc.: IEEE 802.11-17/0908r0 Simulation Results Channel models: Frequency flat channel (AWGN), IEEE 802.11ad #3; AWGN: ~2 dB gap between SQPSK and QPSK, ~3.0 dB gap between QPSK and 16QAM, ~2.5 dB gap between 16QAM and 64QAM; MCSs are defined in the legacy 11ad grid; Submission Slide 9 Intel Corporation
July 2017 doc.: IEEE 802.11-17/0908r0 Proposed MCS Set for OFDM Table 2: Proposed MCS set for OFDM, red color highlights new MCSs. MCS Modulation Code rate NCB = 1, Data rate, Mbps 1 SQPSK 729.47 2 SQPSK 5/8 911.84 3 SQPSK 1094.20 4 SQPSK 13/16 1185.40 5 SQPSK 7/8 1276.60 6 QPSK 1458.90 7 QPSK 5/8 1823.70 8 QPSK 2188.40 9 QPSK 13/16 2370.80 10 QPSK 7/8 2553.20 11 16QAM 2917.90 12 16QAM 5/8 3647.40 13 16QAM 4376.80 14 16QAM 13/16 4741.60 15 16QAM 7/8 5106.30 16 64QAM 5/8 5471.10 17 64QAM 6565.30 18 64QAM 13/16 7112.40 19 64QAM 7/8 7659.50 Submission Slide 10 Intel Corporation
July 2017 doc.: IEEE 802.11-17/0908r0 Simulation Results Figures below show results for augmented MCS grid: Frequency flat channel (AWGN), IEEE 802.11ad #3; Submission Slide 11 Intel Corporation
July 2017 doc.: IEEE 802.11-17/0908r0 Straw Poll Do you agree: to define the MCS set for EDMG OFDM PHY as described in (11- 17-908-00-00ay 30 6 6 Modulation and Coding Scheme for OFDM Mode)? Submission Slide 12 Intel Corporation
July 2017 doc.: IEEE 802.11-17/0908r0 References IEEE802.11-2016 Draft P802.11ay_D0.35 Submission Slide 13 Intel Corporation
