Intersystem Interference Study between Medical Capsule Camera Endoscopy and Other Systems in Co-Channel and Adjacent Bands

Abstract

The Ultra-High Frequency (UHF) band occupies a very vital region in the spectrum and is becoming very congested because many applications use it. The capsule camera (CapCam), an ultra-low power wireless device, is a Short Range Device (SRD) application that utilizes the UHF spectrum for medical endoscopy and it is designed to operate at the 430-440MHz frequency band range. This study will focus on the interference between the CapCam and other systems operating in the frequency of 435MHz and adjacent bands. Other systems that can operate in this band include non-specific SRD and radiolocation services such as airborne radar and ground radar stations. The Minimum Coupling Loss (MCL) method is implemented in this study. The findings showed that restricted distances between the CapCam and other services must be considered when the CapCam is in use. This should be done to avoid harmful interference from the CapCam especially in the case of radiolocation services.

Spectrum Sharing of HAPS and Fixed Link in Millimeter Waves

“…In addition, these two bands are also allocated to wireless Fixed-link Service (FS). Such a situation of spectrum sharing creates a potential for intersystem interference between the HAPS and FS which can lead to the deterioration of the performance of both systems [7,8]. Thus, this study investigates the spectrum sharing feasibility between the HAPS and the FS using the Carrier to Interference plus Noise Ratio (CINR) as a standard criterion to ensure that both systems can safely share the allocated spectrum.…”

“…In general, the role of spectrum sharing studies is to investigate the ability of various wireless systems co-existing in a geographical area to share a certain frequency band with no harmful interference. Interference power created from a wireless system to another can be categorized as either cochannel interference or adjacent channel interference [8]. Essentially, adjacent channel interference can be mitigated using a suitable filter, however, co-channel interference is the most dangerous one, and is the topic of this paper.…”