SIMO channel performance evaluation on indoor environment at 2.4 GHz
📝 Abstract
This work presents an experimental study of Single Input Multiple Output (SIMO) channel performance in indoor radio propagation environment. Indoor channel measurements at 2.4 GHz ISM frequency band have been performed using a versatile channel sounder testbed platform. A single transmitting antenna, four receiving antennas with two proposed geometries and a four-branch receiver circuitry were used in order to achieve channel sounder measurements exploiting baseband signal processing techniques. Deep investigation on SIMO wireless channel performance was realized through three types of metrics which are signal strength, gain coefficient and capacity. Performance results indicate SIMO channel capacity enhancement and illustrate differences between the two proposed geometries.
💡 Analysis
This work presents an experimental study of Single Input Multiple Output (SIMO) channel performance in indoor radio propagation environment. Indoor channel measurements at 2.4 GHz ISM frequency band have been performed using a versatile channel sounder testbed platform. A single transmitting antenna, four receiving antennas with two proposed geometries and a four-branch receiver circuitry were used in order to achieve channel sounder measurements exploiting baseband signal processing techniques. Deep investigation on SIMO wireless channel performance was realized through three types of metrics which are signal strength, gain coefficient and capacity. Performance results indicate SIMO channel capacity enhancement and illustrate differences between the two proposed geometries.
📄 Content
SIMO channel performance evaluation on indoor environment at 2.4 GHz
Constantinos I. Votis, Vasilis Christofilakis* and Panos Kostarakis Physics Department, Electronics-Telecommunications and Applications Laboratory, University of Ioannina Panepistimioupolis, Ioannina, Greece
- Corresponding author. Email: vachrist@uoi.gr SIMO channel performance evaluation on indoor environment at 2.4 GHz
This work presents an experimental study of Single Input Multiple Output
(SIMO) channel performance in indoor radio propagation environment. Indoor
channel measurements at 2.4 GHz ISM frequency band have been performed
using a versatile channel sounder testbed platform. A single transmitting antenna,
four receiving antennas with two proposed geometries and a four-branch receiver
circuitry were used in order to achieve channel sounder measurements exploiting
baseband signal processing techniques. Deep investigation on SIMO wireless
channel performance was realized through three types of metrics which are signal
strength, gain coefficient and capacity. Performance results indicate SIMO
channel capacity enhancement and illustrate differences between the two
proposed geometries.
Keywords: SIMO processing; channel capacity; antenna array configuration; test
bed platform
- Introduction
Nowadays, multiple-element wireless technologies on transmitter and/or receiver end promise channel capacity enhancement and remarkable spectral efficiency. In an indoor environment, such technologies ensure quite low correlated propagation paths that exist on the wireless channel between transmitter and receiver (Chua, Tse, Kahn and Valenzuala 2002; Da-Shan, Foschini, Gans and Kahn 2000; Saunders and Aragón- Zavala 2007).
SIMO architecture uses multiple-elements only on the receiver end. A single transmitting antenna radiates an RF signal, and the corresponding signal replicas are collected by an antenna array on the receiver end. In this way, SIMO architecture has the potential to increase the channel capacity through receiving diversity techniques (Votis, Tatsis, Christofilakis and Kostarakis 2012). It is well known that significant channel capacity increment is obtained by using multiple antennas on both transmitting and receiving sides creating a so-called MIMO architecture (Winters 1987; Foschini & Gans 1998). On the other hand, MIMO channel sounder needs a multiplexing technique to separate signals from all transmitting antennas, increasing the complexity and the cost of a communication system (Kim, Jeon, Lee, and Chung 2007). In this work, a SIMO channel sounder platform was developed instead of MIMO due to cost and simplicity reasons.
Extensive research on multi-antenna channel performance evaluation includes
theoretical studies, realistic channel simulation models and mathematical manipulations
on channel conditions (Da-Shan, Foschini, Gans and Kahn 2000; Hui, Yong, & Toh
2010; Mangoud 2012; Wang and Hui 2011). Production of commercial multi-antenna
systems in indoor/outdoor environments’ requires full knowledge and understanding of
channel conditions, which can only be achieved with in-depth analysis of channel
measurement data (Maharaj, Wallace, Jensen, & Linde 2008). In any case, research on
multi-antenna architecture performance includes numerous channel characterization
works that utilize theoretical and experimental aspects on various radio propagation
environments. Some of them are based on theoretical processes (Golden, Foschini,
Valenzuela, & Wolniansky 1999), some other are stochastic (Weichselberger, Herdin,
Ozcelik & Bonek 2006 ; Bonek & Weichselberger 2005) and the rest of them depend on
experimental measurements (Swindlehurst, German, Wallace & Jensen 2001 ; Martin,
Winters, & Sollenberger 2001). These works exploit methods and techniques in order to
confirm the significant channel capacity enhancement that is promised by using MIMO
architecture. Both theoretical and stochastic works on MIMO channel characterization
have no dependence on the exact characteristics of the radio propagation environment.
Instead, experimental channel sounder measurements provide a versatile and efficient
way in studying and investigating MIMO channel performance. Channel sounder
platforms are utilized in order to provide experimental channel characterization. The
resultant data offer a large amount of considerations that can provide channel
propagation model development. Many useful methods are also introduced to enhance
channel sounder applications such as space-time coding and OFDM techniques
(Chronopoulos, Tatsis, Raptis & Kostarakis 2011).
In this paper, we describe experimental results on SIMO channel capacity
enhancement that are obtained with a 1x4 SIMO channel sounder platform at 2.4 GHz.
The present work is primarily motivated by the following facts:
Concerning multiple rec
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