doc.: IEEE wng-r1 Contribution Labeling Diversity Date: November 2013 Maciej Krasicki (Poznan University of Technology)Slide 1 Authors:

doc.: IEEE wng-r1 Contribution Outline Diversity BI-STCM-ID Labeling diversity Analytical & simulation results Discussion November 2013 Maciej Krasicki (Poznan University of Technology)Slide 2

doc.: IEEE wng-r1 Contribution Diversity To protect signal against fading effects Information transmitted through a number of diversity branches to get independent replicas Diversity branches: –time –frequency –polarization –space  multi-antenna transmission and/or reception (SC, EGC, MRC, etc.), multi-path transmission November 2013 Maciej Krasicki (Poznan University of Technology)Slide 3 –space-time

doc.: IEEE wng-r1 Contribution Bit-Interleaved Space-Time Coded Modulation November 2013 Maciej Krasicki (Poznan University of Technology)Slide 4 Transmitter

doc.: IEEE wng-r1 Contribution Bit-Interleaved Space-Time Coded Modulation (+ iterative decoding) November 2013 Maciej Krasicki (Poznan University of Technology)Slide 5 Receiver Information from channel Information from channel Extrinsic inf. of demapper Extrinsic inf. of demapper Decisions Extrinsic inf. of decoder Extrinsic inf. of decoder

doc.: IEEE wng-r1 Contribution Iteratively-decoded systems  error bounds Error-free-feedback (EF) bound Asymptotic BER performance and coding gain November 2013 Maciej Krasicki (Poznan University of Technology)Slide 6 E b /N 0 (dB) BER R  data rate a  d f c = const. Gray labeling optimal labeling

doc.: IEEE wng-r1 Contribution Asymptotic coding gain in BI-STCM-ID November 2013 Maciej Krasicki (Poznan University of Technology)Slide 7  (1110)  (0100)  (1000)  (1100)  (1101)

doc.: IEEE wng-r1 Contribution Labeling diversity November 2013 Maciej Krasicki (Poznan University of Technology)Slide 8  (1) (0000)  (1) (0010)  (1) (0000)  (1) (0010)  (2) (0000)  (2) (0010) Antenna #1 Antenna #2

doc.: IEEE wng-r1 Contribution Conv. Encoder  mapper (  1 ) (  2 )  x x (1) 2t 2t+1 x x (2) 2t 2t+1 x x (2) 2t+1 (2) 2t d u X t v v 2t2t 2t+1 Transmitter exploiting labelling diversity November 2013 Maciej Krasicki (Poznan University of Technology)Slide 9 Mapper  (1) Mapper  (1) Mapper  (2) Mapper  (2)  (1)  (2) ?

doc.: IEEE wng-r1 Contribution Transmitter exploiting labeling diversity November 2013 Maciej Krasicki (Poznan University of Technology)Slide 10  (1)  (2) ? Intuitive labeling diversity*  (1) – optimal BI-STCM-ID labeling  (2) – improved BI-STCM-ID labeling * M. Krasicki, „Labelling diversity for MIMO systems”, Proc. European Wireless 2011, Wien, April 27-29, 2011 Improved labeling diversity**  (1) – optimal BI-STCM-ID labeling  (2) – found by Binary Switching Algorithm ** M. Krasicki, „Improved labelling diversity”, Proc. Int. Wireless Comm. and Mobile Computing 2011 Conf., Istanbul, April 27-29, 2011

doc.: IEEE wng-r1 Contribution Improved 16-QAM labeling pair November 2013 Maciej Krasicki (Poznan University of Technology)Slide 11

doc.: IEEE wng-r1 Contribution Asymptotic coding gain 12Maciej Krasicki (Poznan University of Technology)

doc.: IEEE wng-r1 Contribution Joint optimization of labeling map pairs* November 2013 Maciej Krasicki (Poznan University of Technology)Slide 13 * M. Krasicki, „Essence of labelling diversity”, Electronics Letters, vol. 49, Issue: 8, April 2013, pp , Compare with the one for BI-STCM-ID:

doc.: IEEE wng-r1 Contribution November 2013 Maciej Krasicki (Poznan University of Technology)Slide 14

doc.: IEEE wng-r1 Contribution Point-wise distance spectrum - categorization of const. points November 2013 Maciej Krasicki (Poznan University of Technology)Slide 15

doc.: IEEE wng-r1 Contribution November 2013 Maciej Krasicki (Poznan University of Technology)Slide 16

doc.: IEEE wng-r1 Contribution November 2013 Maciej Krasicki (Poznan University of Technology)Slide 17

doc.: IEEE wng-r1 Contribution EXIT chart analysis 18Maciej Krasicki (Poznan University of Technology)

doc.: IEEE wng-r1 Contribution EXIT chart analysis 19 E b /N 0 = 1dB Maciej Krasicki (Poznan University of Technology)

doc.: IEEE wng-r1 Contribution BER simulation results 2000 data bits per frame Transmission through uncorrelated Rayleigh fading channel 20Maciej Krasicki (Poznan University of Technology)

doc.: IEEE wng-r1 Contribution Towards higher spectral efficiency 21Maciej Krasicki (Poznan University of Technology) LD

doc.: IEEE wng-r1 Contribution Discussion Could WLANs benefit from LD? Modification of labeling maps required Need for efficient receivers working on the real-time basis Should be considered for different modulation orders Random bit interleaver with high interleaving depth Short-constrained-length codes for early convergence Maciej Krasicki (Poznan University of Technology)22

doc.: IEEE wng-r1 Contribution Straw Poll 1.Do you think the next generation WLANs should be designed for iterative decoding? 2.Do you think labeling diversity merits further consideration for WLANs? Maciej Krasicki (Poznan University of Technology)23