Quasi-Orthogonal STBC in IEEE 802.11aj: Enhanced Wireless Communication
Explore the implementation of Quasi-Orthogonal Space-Time Block Coding (STBC) in IEEE 802.11aj for enhanced wireless communication. This research delves into coding schemes beyond traditional Alamouti codes, aiming to achieve improved performance in systems with multiple antennas. Discover how Quasi-Orthogonal STBC balances transmission rate and diversity order effectively. Dive into the technical details of code matrices, data streams, and their applications in improving wireless communication systems.
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doc.: IEEE 802.11-14/1401r0 November 2014 Quasi-Orthogonal STBC for SC-PHY in IEEE 802.11aj (45GHz) Date: 2014-11-5 Presenter: Haiming Wang Authors/contributors: Name Company Address Phone +86-25-5209 1653-3121 (ext.) +86-25-5209 1653-301 (ext.) Email Shiwen HE hesw01@seu.edu.cn Haiming WANG hmwang@seu.edu.cn 2 Sipailou, Nanjing 210096, China Southeast University (SEU) Yongming HUANG huangym@seu.edu.cn Shimin MA sdtzmsm@126.com Wei HONG +86-25-5209 1650 weihong@seu.edu.cn Bo SUN ZTE sun.bo1@zte.com.cn Submission Shiwen He Haiming Wang Slide 1
doc.: IEEE 802.11-14/1401r0 November 2014 Background - In 802.11n/ac/ad, the orthogonal STBC is widely used for improving the performance of wireless communication systems. - The Alamouti code is the unique scheme to achieve the maximum diversity order as well as full rate transmission in case of 2 transmitting antennas. - Some alternative schemes could be applied in systems with more than 2 antennas. These coding schemes are suboptimal as they cannot achieve full transmission rate and full diversity order simultaneously. - One scheme of Orthogonal STBC can achieve full diversity order at a rate of 1/2. Submission Shiwen He Haiming Wang Slide 2
doc.: IEEE 802.11-14/1401r0 November 2014 Code matrix: * 4 * 3 * 2 * 1 * 3 * 4 * 1 * 2 x * 2 * 1 * 4 * 3 * 1 * 2 * 3 * 4 - - - - - - - - x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x 4 3 2 1 3 4 1 2 - - 2 1 4 3 - - 1 2 3 4 - Quasi Orthogonal STBC can achieve full rate transmission with impairing diversity order. Code matrix: * 4 3 * 3 4 * 2 1 * 1 2 x x * - - - x x x x x x x x x x x x x x 2 * 1 1 - - 2 * - 4 * 3 3 4 The elements in each row are the symbols to be transmitted on each antenna. Submission Shiwen He Haiming Wang Slide 3
doc.: IEEE 802.11-14/1401r0 November 2014 Introduction -Quasi Orthogonal STBC(4 1 -1ss) t1 t2 * 4 3 * 3 4 * 2 1 * 1 2 x x t3 x x x x t4 x x x x * - - - x x x x x x 2 * 1 1 - - 2 y , y , y , y * 1 2 3 4 - 4 * 3 3 4 -Data stream: (0)... (N-1) s (0)... (N-1) s s s (0)... (N-1) s s (0)... (N-1) s s 4 4 2 2 3 3 1 1 ......... x x x x 4 3 2 1 Submission Shiwen He Haiming Wang Slide 4
doc.: IEEE 802.11-14/1401r0 November 2014 - Location in Transmitter: Submission Shiwen He Haiming Wang Slide 5
doc.: IEEE 802.11-14/1401r0 November 2014 - Code block: k-th time slot: = = = = k x (n) (0) (1) ... s (N-1) s s 1 1 1 1 s k x (n) (0) s (1) ... (N-1) s 2 2 2 2 k x (n) (0) (1) ... s (N-1) s s 3 3 3 3 k x (n) (0) (1) ... s (N-1) s s 4 4 4 4 (k+1)-th time slot: = 1 + * * 2 * 2 * 2 k k x x (n) - ((- ) ) =- N n (0) s (N-1) ... (1) s s 1 2 = = 1 + * * 1 * 1 * 1 k k x x ( ) n ((- ) ) = N n (0) (N-1) ... (1) s 0,1... -1 s s n N 2 1 = 1 + * * 4 * 4 * 4 k k x x ( ) - n ((- ) ) =- N n (0) (N-1) ... (1) s s s 3 4 = = 1 + * * 3 * 3 * 3 k k x x ( ) n (( - ) ) n (0) (N-1) ... (1) s s s 4 3 N Submission Shiwen He Haiming Wang Slide 6
doc.: IEEE 802.11-14/1401r0 November 2014 (k+2)-th time slot: = +2 * * 3 * 3 * 3 k k x x (n) - ((- ) ) =- N n (0) s (N-1) ... (1) s s 1 3 = = +2 * * 4 * 4 * 4 k k x x ( ) n - ((- ) ) = - N n (0) (N-1) ... (1) s 0,1... -1 s s n N 2 4 = +2 * * 1 * 1 * 1 k k x x ( ) n ((- ) ) = N n (0) (N-1) ... (1) s s s 3 1 = = +2 * * 2 * 2 * 2 k k x x ( ) n ((- ) ) N (0) (N-1) ... (1) s n s s 4 2 (k+3)-th time slot: = +3 k k x x (n) (( ) ) = N n n (0) (1) ... s (N-1) s s 1 4 4 4 4 (N-1) = +3 k k x x ( ) n - (( ) )=- N n (0) (1) ... s s s 2 3 3 3 3 s = +3 k k x x ( ) n - (( ) )=- N n (0) s (1) ... (N-1) s 3 2 2 2 2 (N-1) = N +3 k k x x ( ) n (( ) ) = N (0) (1) ... s s s 4 1 1 1 1 = 0,1.. . -1 n - Then the original data can be obtained using linear processing in the receiver. Submission Shiwen He Haiming Wang Slide 7
doc.: IEEE 802.11-14/1401r0 November 2014 Simulation - Comparisons of error performance of the 4 1 system with BPSK Modulation and 1/2-rate and 1-ss. QSTBC outperforms CSD by 0.4dB approximately.(PER=0.1) QSTBC outperforms SC-1 1 by 2.2dB approximately.(PER=0.1) Submission Shiwen He Haiming Wang Slide 8
doc.: IEEE 802.11-14/1401r0 November 2014 - Comparisons of error performance of the 4 1 system with QPSK Modulation and 1/2-rate and 1-ss. QSTBC outperforms CSD by 0.8dB approximately.(PER=0.1) QSTBC outperforms SC-1 1 by 1.2dB approximately.(PER=0.1) Submission Shiwen He Haiming Wang Slide 9
doc.: IEEE 802.11-14/1401r0 November 2014 - Comparisons of error performance of the 4 1 system with 16-QAM Modulation and 1/2-rate and 1-ss. QSTBC outperforms CSD by 2dB approximately.(PER=0.1) Submission Shiwen He Haiming Wang Slide 10
doc.: IEEE 802.11-14/1401r0 November 2014 - Comparisons of error performance of the 4 4 system with BPSK Modulation and 1/2-rate and 1-ss. QSTBC outperforms CSD by 0.5dB approximately.(PER=0.1) Submission Shiwen He Haiming Wang Slide 11
doc.: IEEE 802.11-14/1401r0 November 2014 - Comparisons of error performance of the 4 4 system with QPSK Modulation and 1/2-rate and 1-ss. QSTBC outperforms CSD by 0.8dB approximately.(PER=0.1) Submission Shiwen He Haiming Wang Slide 12
doc.: IEEE 802.11-14/1401r0 November 2014 - Comparisons of error performance of the 4 4 system with 16QAM Modulation and 1/2-rate and 1-ss. QSTBC outperforms CSD by 1.5dB approximately.(PER=0.1) Submission Shiwen He Haiming Wang Slide 13
doc.: IEEE 802.11-14/1401r0 November 2014 Conclusion Similar as the conventional Alamouti s code with 2 antennas, the QO-STBC can also obtain the full-rate transmission. Considering the implementation of algorithm of QOSTBC based on linear processing is low- complexity, and all the signal processing can be performed on existing resources. It s reasonable to apply QO-STBC to the SC-PHY of 802.11aj (45GHz) to improve link robustness or extend coverage. The QO-STBC is also possible to used for the OFDM-PHY of 802.11aj (45GHz). hardware, the decoding Submission Shiwen He Haiming Wang Slide 14
doc.: IEEE 802.11-14/1401r0 November 2014 Reference [1] Single-Carrier Frequency-Domain Equalization for Space Time Block-Coded Transmissions over Frequency-Selective Fading Channels [2] Single-Carrier Frequency-Domain Equalizer with Multi-Antenna Transmit Diversity [3] Frequency Domain DFE for Single-Carrier STBC Block Transmission [4] Coding for MIMO Communication Systems, Tolga M.Duman, Ali Ghrayeb Submission Shiwen He Haiming Wang Slide 15
doc.: IEEE 802.11-14/1401r0 November 2014 Thanks for Your Attention! Submission Shiwen He Haiming Wang Slide 16
