September 2014 doc 11 14 1083 00 00

September 2014 doc. : 11 -14 -1083 -00 -00 aj STBC in Single Carrier(SC) for IEEE 802. 11 aj (45 GHz) Date: 2014 -09 -09 Presenter: Shiwen HE Authors/contributors: Submission Slide 1 Shiwen He, Haiming Wang

September 2014 doc. : 11 -14 -1083 -00 -00 aj Abstract • Propose an Alamouti-like scheme combining space-time block coding with single-carrier frequency-domain equalization for IEEE 802. 11 aj (45 GHz). Submission Slide 2 Shiwen He, Haiming Wang

September 2014 doc. : 11 -14 -1083 -00 -00 aj Background • The primary challenge in wireless block transmission systems is the time dispersive nature of the multipath fading channel, which can cause severe intersymbol interference (ISI), resulting in an inevitable system performance deterioration. • Alamouti’s space–time block coding (STBC) scheme has been proposed in IEEE 802. 11 n and IEEE 802. 11 ac since – it achieves full spatial diversity at full transmission rate for 2 transmit antennas and any signal constellation. – it does not require channel state information at the transmitter. – maximum likelihood decoding of STBC requires only simple linear processing. Submission Slide 3 Shiwen He, Haiming Wang

September 2014 doc. : 11 -14 -1083 -00 -00 aj Background cont. • In IEEE 802. 11 n and IEEE 802. 11 ac, STBC is used with OFDM. Compared with OFDM, Single Carrier –Frequency Domain Equalization(SC-FDE) has similar implementation complexity and performance, while avoiding the major drawbacks of OFDM, including high peak-to-average power ratio and sensitivity to carrier frequency offset. • This submission proposes the STBC scheme in SC for IEEE 802. 11 aj. Submission Slide 4 Shiwen He, Haiming Wang

September 2014 doc. : 11 -14 -1083 -00 -00 aj Scheme: Tx 2 Rx 1 • Block format for proposed STBC transmission scheme. Submission Slide 5 Shiwen He, Haiming Wang

September 2014 doc. : 11 -14 -1083 -00 -00 aj Scheme: Tx 2 Rx 1 • The stream of block complex numbers , , is the input to the STBC encoder, which produces as output the stream of complex numbers , , . For given , STBC processing operates on the complex modulation symbols as follows: where , , Note：the transmitted power from each antenna is half its value in the single-transmit case so that total transmitted power is fixed. Submission Slide 6 Shiwen He, Haiming Wang

September 2014 doc. : 11 -14 -1083 -00 -00 aj Scheme: Tx 4 Rx 2 or Tx 4 Rx 4 • Block format for proposed STBC transmission scheme(2 space streams). 1 st space stream 2 nd space stream Submission Slide 7 Shiwen He, Haiming Wang

September 2014 doc. : 11 -14 -1083 -00 -00 aj Constellation mapper output to spatial mapper input for STBC is th transmitted block from space stream , , , encoder，where Submission Slide 8 is the output of STBC. Shiwen He, Haimin Wang

September 2014 doc. : 11 -14 -1083 -00 -00 aj Simulation • Comparisons of error performance of the 2 x 1 system(1 space stream) with BPSK Modulation and 1/2 -rate. 1. 4 d. B gain CSD STBC Submission Slide 9 Shiwen He, Haiming Wang

September 2014 doc. : 11 -14 -1083 -00 -00 aj Simulation • Comparisons of error performance of the 2 x 1 system(1 space stream) with QPSK Modulation and 1/2 -rate. . 1. 7 d. B gain STBC CSD Submission Slide 10 Shiwen He, Haiming Wang

September 2014 doc. : 11 -14 -1083 -00 -00 aj Simulation • Comparisons of error performance of the 2 x 1 system(1 space stream) with 16 -QAM Modulation and 1/2 -rate. 1. 8 d. B gain Submission Slide 11 Shiwen He, Haiming Wang

September 2014 doc. : 11 -14 -1083 -00 -00 aj Simulation • Comparisons of error performance of the 4 x 2 system and 2 x 2 system with 1/2 -rate and 2 space streams. Submission Slide 12 Shiwen He, Haiming Wang

September 2014 doc. : 11 -14 -1083 -00 -00 aj Simulation • Comparisons of error performance of the 4 x 4 system and 2 x 4 system with 1/2 -rate and 2 space streams. Submission Slide 13 Shiwen He, Haiming Wang

September 2014 doc. : 11 -14 -1083 -00 -00 aj Conclusion • The proposed single-carrier transmit-diversity scheme for frequencyselective channels is low-complexity • The scheme combines the advantages of an Alamouti-like space–time block-coding scheme and FFT-based single-carrier frequency-domain equalization. • The scheme can be particularly useful in order to achieve transmit diversity when signalling with higher order constellations (e. g. 16 QAM) as the complexity of the equalization is not increased. • Significant performance gains over transmission without STBC were demonstrated for IEEE 802. 11 aj. Submission Slide 14 Shiwen He, Haiming Wang

September 2014 doc. : 11 -14 -1083 -00 -00 aj References • [1] IEEE 802. 11 n, IEEE 802. 11 ac • [2] N. Al-Dhahir, “Single-Carrier Frequency-Domain Equalization for Space. Time Block-Coded Transmissions Over Frequency-Selective Fading Channels, ” IEEE Commun. Lett. , vol. 5, no. 7, July 2001. • [3] Q. Wang, C. Yuan, J. Zhang, Z. Hu, and Y. Li, “Frequency Domain DFE for Single-Carrier STBC Block Transmission, ” IEEE Commun. Lett. , vol. 17, no. 6, June 2013. • [4] D. Falconer, S. Ariyavisitakul, A. Benyamin-Seeyar, and B. Eidson, “Frequency domain equalization for single-carrier broadband wireless systems, ” IEEE Commun. Mag. , vol. 40, no. 4, pp. 58 C 66, Apr. 2002. Submission Slide 15 Shiwen He, Haiming Wang

September 2014 doc. : 11 -14 -1083 -00 -00 aj Thanks for Your Attention. Submission Slide 16 Shiwen He, Haiming Wang