Antenna Array Designs for OFDM WLAN Indoor Transmission

Abstract

Wireless local area networks (WLAN's) based on the 802.11 standards are ubiquitous. However, the popularity of WLAN's has made interference between WLAN users an issue. Spatial division multiple access (SDMA) is one way to orthogonalize these users and reduce interference. The contribution of this paper is to use real antenna array prototypes to determine the best array design for implementing indoor SDMA. Two SDMA antenna array prototypes are constructed and used to collect propagation measurements in an indoor environment. The propagation data is then incorporated into an SDMA orthogonal frequency division multiplexing (OFDM) analysis. This approach is able to very accurately predict how the two array designs will influence SDMA-OFDM performance in the indoor environment where the measurements are collected. The results indicate that the compact sectorized antenna array prototype performs better than the linear array prototype for in-room communication and that the reverse is true for inter-room communication.

SαS noise suppression for OFDM wireless communication in rayleight channel

“…Improvements in theOrthogonal Frequency Division Multiplexing OFDM communication system have become a major focus of research, as itis increasingly being adopted as a physical-layer modulation scheme in latest and emerging wireless standards. OFDM has been chosen for Wi-Fi arena [7] where the standards like 802.11a, 802.11n, 802.11ac and more. It has also been adopted for the cellular telecommunications standard LTE / LTE-A, WiMAX [8] and many more.…”