Omni-directional Multi-Antenna TX Techniques Comparison
Explore the comparison between cyclic shift diversity (CSD) and OFDM symbol diversity (OSD) in TX diversity techniques for improving wireless communication performance. Learn how OSD, a technique transmitting different OFDM symbols through TX antennas, offers advantages over CSD, particularly in scenarios like TX Diversity for OOK. Discover the implications of OFDM symbol diversity and its impact on signal quality and spatial nulling. Dive into simulation results and performance outcomes to understand the effectiveness of these techniques in enhancing communication systems.
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May 2018 doc.: IEEE 802.11-18/881r0 Omni-directional multi-antenna TX through OFDM symbol diversity Date: 2018-05-06 Authors: Name Miguel Lopez Affiliations Address Ericsson Phone email miguel.m.lopez@erics son.com dennis.sundman@eric sson.com leif.r.wilhelmsson@er icsson.com Dennis Sundman Ericsson Leif Wilhelmsson Ericsson Submission Slide 1 Miguel Lopez, Ericsson
May 2018 doc.: IEEE 802.11-18/881r0 Abstract There are TX diversity techniques other than cyclic shift diversity (CSD) [1,2]. In this presentation we compare CSD with another technique that we call OFDM symbol diversity (OSD). Submission Slide 2 Miguel Lopez, Ericsson
May 2018 doc.: IEEE 802.11-18/881r0 TX Diversity for OOK Since the receiver is only concerned with the envelope/power of the signal (non-coherent detection), there is no need to use CSD. Submission Slide 3 Miguel Lopez, Ericsson
May 2018 doc.: IEEE 802.11-18/881r0 OFDM Symbol Diversity An example of a TX diversity technique is OFDM symbol diversity (OSD) Different OFDM symbols are transmitted through the TX antennas [1] The OFDM symbols are chosen to avoid unintentional spatial nulling Submission Slide 4 Miguel Lopez, Ericsson
May 2018 doc.: IEEE 802.11-18/881r0 Simulation results Low data rate Genie-aided synchronization Two TX antennas CSD of 1 us Submission Slide 5 Miguel Lopez, Ericsson
May 2018 doc.: IEEE 802.11-18/881r0 OFDM symbol diversity, example 1 Subcarrier Single antenna and CSD [3] OFDM symbol diversity Antenna 1 -0.3835 - 0.6903i -0.8437 - 0.2301i 0.0767 + 0.0767i 1.1504 - 0.2301i 0.6903 - 1.1504i 0.5369 - 0.3835i 0.0000 + 0.0000i 0.3835 - 0.5369i -1.1504 + 0.6903i 0.2301 - 1.1504i 0.0767 + 0.0767i 0.2301 + 0.8437i -0.6903 - 0.3835i Antenna 2 -0.6903 - 0.3835i -0.5369 + 0.6903i -0.0767 + 0.0767i 0.6903 + 1.1504i 1.1504 - 0.6903i -0.6903 + 0.0767i 0.0000 + 0.0000i 0.0767 - 0.6903i 0.6903 - 1.1504i 1.1504 + 0.6903i -0.0767 + 0.0767i 0.6903 - 0.5369i 0.3835 + 0.6903i -6 -0.6903 - 0.3835i -0.5369 + 0.6903i -0.0767 + 0.0767i 0.6903 + 1.1504i 1.1504 - 0.6903i -0.6903 + 0.0767i 0.0000 + 0.0000i 0.0767 - 0.6903i 0.6903 - 1.1504i 1.1504 + 0.6903i -0.0767 + 0.0767i 0.6903 - 0.5369i 0.3835 + 0.6903i -5 -4 -3 -2 -1 DC 1 2 3 4 5 6 Submission Slide 6 Miguel Lopez, Ericsson
May 2018 doc.: IEEE 802.11-18/881r0 Performance results TGn Submission Slide 7 Miguel Lopez, Ericsson
May 2018 doc.: IEEE 802.11-18/881r0 OFDM symbol diversity, example 2 Subcarrier Single antenna and CSD [4] OFDM symbol diversity Antenna 1 1 1 1 -1 -1 -1 0 1 -1 1 1 -1 1 Antenna 2 -6 1 1 1 -1 -1 -1 0 1 -1 1 1 -1 1 -1 1 -1 -1 1 -1 0 1 1 -1 -1 -1 1 -5 -4 -3 -2 -1 DC 1 2 3 4 5 6 Submission Slide 8 Miguel Lopez, Ericsson
May 2018 doc.: IEEE 802.11-18/881r0 Performance results TGn Submission Slide 9 Miguel Lopez, Ericsson
May 2018 doc.: IEEE 802.11-18/881r0 Conclusion and discussion CSD is one among several TX diversity techniques The magnitude of the cyclic shifts in CSD can be tuned in several ways, and the performance depends on the choice of the MC-OOK ON symbol [2],[4] There are other TX diversity techniques that exhibit performance comparable to CSD There is no need to specify which TX diversity technique to use for the OOK part of the wake-up signal Submission Slide 10 Miguel Lopez, Ericsson
May 2018 doc.: IEEE 802.11-18/881r0 References [1]: 11-18-0144-02-00ba, Omni-directional Multiple Antenna Transmission for WUS , D. Sundman, L. Wilhelmsson, M. Lopez. [2]: 11-18-0413-02-00ba, Discussion on WUR Multi- Antenna Transmission , R. Cao, S. Srinivasa, H. Zhang. [3]: 11-18-0144-02-00ba, MC-OOK Symbol Design , M. Lopez, D. Sundman, L. Wilhelmsson. [4]: 11-18-0773-00-00ba, Multiantenna TX Diversity , S. Shellhammer, B. Tian. Submission Slide 11 Miguel Lopez, Ericsson
