A space diversity channel model for multipath propagation measurements in New Zealand

1991 ◽  
Vol 39 (5) ◽  
pp. 683-688
Author(s):  
M. Shafi ◽  
W. Smith
Keyword(s):  
New Zealand ◽  
Channel Model ◽  
Multipath Propagation ◽  
Space Diversity

Space diversity improvement factors for overwater path in New Zealand

1989 ◽  
Vol 25 (21) ◽  
pp. 1437 ◽  
Author(s):  
W.E. Smith ◽  
M. Shafi
Keyword(s):  
New Zealand ◽  
Space Diversity

scholarly journals Statistical Characteristics of Measured 3-Dimensional MIMO Channel for Outdoor-to-Indoor Scenario in China and New Zealand

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Yawei Yu ◽  
Jianhua Zhang ◽  
Mansoor Shafi ◽  
Min Zhang ◽  
Jawad Mirza
Keyword(s):  
New Zealand ◽  
Channel Model ◽  
Elevation Angle ◽  
Statistical Characteristics ◽  
Mimo Channel ◽  
Delay Spread ◽  
Angle Of Arrival ◽  
Power Delay Profile ◽  
3 Dimensional ◽  
Rms Delay Spread

The 3-dimensional (3D) channel model gives a better understanding of statistical characteristics for practical channels than the 2-dimensional (2D) channel model, by taking the elevation domain into consideration. As different organizations and researchers have agreed to a standard 3D channel model, we attempt to measure the 3D channel and determine the parameters of the standard model. In this paper, we present the statistical propagation results of the 3D multiple-input and multiple-output (MIMO) channel measurement campaign performed in China and New Zealand (NZ). The measurements are done for an outdoor-to-indoor (O2I) urban scenario. The dense indoor terminals at different floors in a building form a typical 3D propagation environment. The key parameters of the channel are estimated from the measured channel impulse response (CIR) using the spatial-alternating generalized expectation-maximization (SAGE) algorithm. Till now there is abundant research performed on the azimuth domain; this paper mainly considers the statistical characteristics of the elevation domain. A statistical analysis of 3D MIMO channel results for both China and NZ measurements is presented for the following parameters: power delay profile (PDP), root mean square (rms), delay spread (DS), elevation angle-of-arrival (EAoA) distribution, elevation angle-of-departure (EAoD) distribution, elevation angular spread (AS), and cross-polarization discrimination (XPD).

scholarly journals A comparative simulation study of different decoding schemes in LDPC coded OFDM systems for NB-PLC channel

2019 ◽  
Vol 15 (1) ◽  
pp. 306
Author(s):  
Nejwa El maammar ◽  
Seddik Bri ◽  
Jaouad Foshi
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Belief Propagation ◽  
Channel Model ◽  
Impulsive Noise ◽  
Multipath Propagation ◽  
Ofdm Systems ◽  
Ldpc Decoder ◽  
Power Line Communications ◽  
Decoding Algorithms ◽  
Coded Ofdm

In this paper, we study the performance of Low density Parity Check (LDPC) coded orthogonal frequency-division multiplexing (COFDM) systems  when they are applied on the short data block of a narrowband (NB) power line communications (PLC) channel. In the modelled system simulations have been performed using different code lengths. It is assumed that the channel has a multipath propagation with two different noise scenarios: AWGN background noise with and without the presence of impulsive noise. Performances of Various soft and hard decision LDPC decoder schemes such as belief propagation (BP), weighted bit flipping (WBF), improved weighted bit flipping (IWBF) and implementation-efficient reliability ratio based weighted bit flipping (IRRWBF) decoders were investigated. It has been shown for all simulations performed in PLC channel model showed that remarkable performance improvement can be achieved by using short-length LDPC codes. Especially, the improvements are striking when the BP decoding algorithms are employed on the receiver side.

scholarly journals Radio Channel Characterization in Dense Forest Environments for IoT-5G

Proceedings ◽  
2018 ◽  
Vol 4 (1) ◽  
pp. 19
Author(s):  
Peio Lopez-Iturri ◽  
Erik Aguirre ◽  
Mikel Celaya-Echarri ◽  
Leyre Azpilicueta ◽  
Alejandro Eguizábal ◽  
...  
Keyword(s):  
Communication Systems ◽  
Channel Model ◽  
Multipath Propagation ◽  
Radio Channel ◽  
Path Loss ◽  
Simulation Software ◽  
Delay Spread ◽  
Radio Link ◽  
Zone Model ◽  
Dense Forest

The attenuation due to vegetation can limit drastically the performance of Wireless Sensor Networks (WSN) and the Internet of Things (IoT) communication systems. Even more for the envisaged high data rates expected for the upcoming 5G mobile wireless communications. In this context, radio planning tasks become necessary in order to assess the validity of future WSN and IoT systems operating in vegetation environments. For that purpose, path loss models for scenarios with vegetation play a key role since they provide RF power estimations that allow an optimized design and performance of the wireless network. Although different propagation models for vegetation obstacles can be found in the literature, a model combining path loss and multipath propagation is rarely considered. In this contribution, we present the characterization of the radio channel for IoT and 5G systems working at 2.4 GHz, focusing on the radio links blocked by oak and pine trees modelled from specimens found in a real recreation area located within a dense forest environment. This specific forest, composed of thick in-leaf trees, is called Orgi Forest and it is situated in Navarre, Spain. In order to fit and validate a radio channel model for this type of scenarios, both measurements and simulations by means of an in-house developed 3D Ray Launching algorithm have been performed, offers as outcomes the path loss and multipath information of the scenario under study. A geometrical and dielectric model of the trees were created and introduced in the simulation software. The path loss was then estimated as dependent of the radio link range for two species of trees at 2.4 GHz. We concluded that the scattering produced by the tree can be divided into two zones with different dominant propagation mechanisms: a free-space zone far from the tree and a diffraction zone around the edge of the tree. 2D planes of delay spread value are also presented which similarly reflects the proposed two-zone model.

scholarly journals Physical layer simulation results for IEEE 802.15.3c with different channel models

2011 ◽  
Vol 9 ◽  
pp. 173-177 ◽  
Author(s):  
M. Liso Nicolás ◽  
M. Jacob ◽  
T. Kürner
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Channel Model ◽  
Multipath Propagation ◽  
Signal To Noise Ratio ◽  
Physical Layer ◽  
Link Quality ◽  
60 Ghz ◽  
Single Carrier ◽  
Ieee 802.15.3C

Abstract. This paper investigates the performance of the 60 GHz IEEE 802.15.3c physical layer (PHY) specification in terms of bit error rate (BER) against signal to noise ratio. Two PHY modes of the standard have been implemented and simulated, i.e., Single Carrier and High Speed Interface. The first mode uses single carrier (SC) block transmission and the second mode uses orthogonal frequency division multiplexing (OFDM). One of the main issues in the new 60 GHz standards is multipath propagation, which plays an important role in the link quality. Thus, we have tested the PHY with the IEEE standard channel model, ray tracing simulations and real 60 GHz measurements.

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