Analysis of Channel Model for LAA-WLAN Coexistence with different OFDM Parameters between LAA and Wi-Fi

TL;DR

This paper investigates the channel model for asynchronous coexistence of Wi-Fi and LAA-LTE, focusing on the impact of differing OFDM parameters on signal distortion and orthogonality, which affects throughput.

Contribution

It introduces a detailed analysis of the distortion caused by different OFDM parameters between LAA-LTE and Wi-Fi, aiding in throughput evaluation.

Findings

Derived the distortion of LAA-LTE signals at Wi-Fi devices.

Analyzed the impact of OFDM parameter differences on orthogonality.

Provided insights into throughput degradation due to asynchronous coexistence.

Abstract

In this work, the channel model for the asynchronous Wi-Fi and LAA signals is investigated, also taking into consideration the impairment of the OFDM parameters between LAA and Wi-Fi. Even for the same bandwidth, e.g., 20 MHz channel, OFDM parameters of LAA-LTE and Wi-Fi are different [1], [2]. In addition, the legacy Wi-Fi devices cannot receive or transmit synchronously with LAA-LTE. Thus, the orthogonality between the subcarriers is broken if LAA-LTE's signals are received at Wi-Fi devices and vice versa. In order to facilitate an analysis of the throughput, we should derive the distortion of LAA-LTE's signals received at Wi-Fi devices and the distortion of Wi-Fi's signals received at LAA-LTE devices due to the difference in OFDM parameters of LAA-LTE and Wi-Fi.