STBC Scheme Proposal for EDMG OFDM PHY in 11ay
This presentation outlines a proposal for Space-Time Block Coding (STBC) scheme definition in IEEE 802.11-17/0754r0 for EDMG OFDM PHY in the 11ay standard. It discusses STBC schemes, signal subcarriers mapping, received signals in frequency domain, ZF equalizer solution, and SQPSK OFDM modulation. The document addresses channel coefficients, noise samples, estimation of channel coefficients, and modulation techniques for improved communication efficiency.
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May 2017 doc.: IEEE 802.11-17/0754r0 STBC for OFDM PHY in 11ay Date: 2017-05-07 Authors: Name Affiliations Address Phone email +7 (831) 2969444 Turgeneva 30, Nizhny Novgorod, 603024, Russia artyom.lomayev@intel.com Artyom Lomayev 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
May 2017 doc.: IEEE 802.11-17/0754r0 Introduction This presentation proposes Space-Time Block Coding (STBC) scheme definition for EDMG OFDM PHY in 11ay. Submission Slide 2 Intel Corporation
May 2017 doc.: IEEE 802.11-17/0754r0 STBC in 11n/ac for OFDM PHY The IEEE 802.11 n/ac standard defines the STBC schemes with the number of input spatial stream NSS and the number of output space-time streams NSTS = 2*NSS. The signal subcarriers mapping for (NSS = 1, NSTS = 2) scheme is shown in figure below, [1]. k-th subcarrier Y(k) X(k) . . . . . . STS #1 . . . OFDM symbol #1 OFDM symbol #2 conj(X(k)) -conj(Y(k)) . . . . . . STS #2 . . . OFDM symbol #1 OFDM symbol #2 time n = 1 n = 2 Submission Slide 3 Intel Corporation
May 2017 doc.: IEEE 802.11-17/0754r0 STBC in 11n/ac for OFDM PHY (Cont d) Received signals in frequency domain: OFDM symbol n = 1: R1(k) = H1(k)*X(k) H2(k)*Y*(k) + Z1(k); OFDM symbol n = 2: R2(k) = H2(k)*X*(k) + H1(k)*Y(k) + Z2(k); where: H1(k) and H2(k) channel coefficients as shown below; Z1(k) and Z2(k) AWGN ~CN(0, 2) noise samples; TX antenna #2 RX antenna #1 H2 Combiner H1 Noise Submission Slide 4 Intel Corporation
May 2017 doc.: IEEE 802.11-17/0754r0 STBC in 11n/ac for OFDM PHY (Cont d) ZF equalizer solution: The estimated X^(k) and Y^(k) signals can be written as follows: ^ ^ ( ) ( ) k ( ) ( ) k ( ) ( ) k 2 ( ) ( ) k ^ X k R k * 1 1 H k H k = 1 2 ( ) * ^ ^ 2 2 ^ * 2 Y R ^ ^ ( ) k ( ) k * H H + H H 1 1 2 where H1^(k) and H2^(k) estimations of channel coefficients; Submission Slide 5 Intel Corporation
May 2017 doc.: IEEE 802.11-17/0754r0 SQPSK OFDM Modulation in 11ay SQPSK modulation mapping is shown in figure below: Two coded bits (c2k, c2k+1) are modulated to two subcarriers (Xk, XP(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]; Xk XP(k) 1 X j x 1 k = 2 k 1 X j 2 x ( ) k + P 2 1 k = Q Data subcarrier k Data subcarrier P(k) Submission Slide 6 Intel Corporation
May 2017 doc.: IEEE 802.11-17/0754r0 QPSK OFDM Modulation in 11ay QPSK modulation mapping is shown in figure below: Four coded bits (c4k, c4k+1, c4k+2, c4k+3) are modulated to two subcarriers (Xk, XP(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; Xk XP(k) 1 2 X x 1 k = 2 k 2 1 X 5 x ( ) k + P 2 1 k = Q Data subcarrier k Data subcarrier P(k) Submission Slide 7 Intel Corporation
May 2017 doc.: IEEE 802.11-17/0754r0 STBC for SQPSK/QSPK in 11ay The STBC mapping scheme with SQPSK, QPSK modulation is shown below. P(k) = NSD/2 + k, i.e. Static Tone Paring (STP) is used. It occupies 8 subcarriers and extracts space-time-frequency diversity gain. STBC SPQSK, QPSK mapping scheme Yk YP(k) Xk XP(k) STS #1 1st half of spectrum Data subcarrier k 2nd half of spectrum Data subcarrier P(k) -conj(Yk) -conj(YP(k)) conj(Xk) conj(XP(k)) STS #2 n = 2 n = 1 time Submission Slide 8 Intel Corporation
May 2017 doc.: IEEE 802.11-17/0754r0 STBC for OFDM in 11ay For 11ay data transmission it is proposed to keep the same scheme with (NSS = 1, NSTS = 2) as defined for 11n/ac. It is proposed to introduce space-time pilots encoding as shown in figure below. k-th subcarrier PNSP(iSTS=2, k) PNSP(iSTS=1, k) . . . . . . STS #1 . . . OFDM symbol #1 OFDM symbol #2 PNSP(iSTS=1, k) -PNSP(iSTS=2, k) . . . . . . STS #2 . . . OFDM symbol #1 OFDM symbol #2 time n = 1 n = 2 Submission Slide 9 Intel Corporation
May 2017 doc.: IEEE 802.11-17/0754r0 STBC for OFDM in 11ay (Cont d) The sequences PNSP(iSTS, :) are composed of 1 symbols, therefore conj() is not required. NSP defines the number of pilots per OFDM symbol. It is proposed to reuse sequences PNSP(iSTS, :) defined for regular MIMO transmission. Submission Slide 10 Intel Corporation
May 2017 doc.: IEEE 802.11-17/0754r0 SP/M Do you agree: To include spec text proposed in (11-17-0753-00-00ay 30 6 6 2 Space Time Block Coding) defining STBC scheme for OFDM PHY into the spec draft? Submission Slide 11 Intel Corporation
May 2017 doc.: IEEE 802.11-17/0754r0 References IEEE802.11-2016 Draft P802.11ay_D0.3 Submission Slide 12 Intel Corporation
