Codebook Selection Strategies in Long-range Sub-1 GHz WLANs

Abstract

Wireless environmental systems, such as those used in smart cities and smart grids, will be much easier and
cheaper to set up thanks to the new long-range WLANs. The new IEEE 802.11ah WLAN standard makes use
of 900MHz ISM-band transmission bands and supports multi-antenna MIMO-OFDM. Precoding selection is
a technique used to expand cellular networks' range. Solutions are discussed and evaluated. This research
focuses on the Grassmannian and the Kerdock manifold because of their efficiency and clarity. The Kerdock
manifold has been found to be more efficient due to its decreased quantized codeword’s and improved SNR,
whereas the Grassmannian manifold may provide an optimum codeword distance. The suggested Kerdock
manifold has been shown to improve range by 2-3 dB in both simulation tests and real-world evaluations.