An adaptive geometry-based stochastic model for non-isotropic MIMO mobile-to-mobile channels

• Published in: IEEE transactions on wireless communications Vol. 8; no. 9; pp. 4824 - 4835
• Main Authors: Xiang Cheng, Cheng-Xiang Wang, Laurenson, D.I., Salous, S., Vasilakos, A.V.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.09.2009; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antennas and propagation; Applied sciences; Channels; Correlation; Density; Equipments and installations; Exact sciences and technology; Image processing; Intelligent transportation systems; Land mobile radio cellular systems; Mathematical models; MIMO; Mobile communication; Mobile radiocommunication systems; Mobile-to-mobile channels; non-isotropic scattering environments; Radiocommunications; Scattering; Signal processing; Solid modeling; space-Doppler-frequency power spectrum density; space-time-frequency correlation function; Spectra; Stochastic models; Stochastic processes; Stochasticity; Studies; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Teletraffic; Transmission and modulation (techniques and equipments); Utilities; Wireless communication; Fading channels; Space time correlation; Mobile radiocommunication; MIMO system; Mobile-to-mobile channels; Stochastic model; Line of sight propagation; space-time-frequency correlation function; Two channel system; Wireless telecommunication; Power spectral density; Theoretical study; Teletraffic; Rice fading; Impact study; non-isotropic scattering environments; Time correlation function; Guidance; Doppler frequency; Frequency spectrum; MIMO; space-Doppler-frequency power spectrum density
• ISSN: 1536-1276; 1558-2248
• DOI: 10.1109/TWC.2009.081560

In this paper, a generic and adaptive geometrybased stochastic model (GBSM) is proposed for non-isotropic multiple-input multiple-output (MIMO) mobile-to-mobile (M2M) Ricean fading channels. The proposed model employs a combined two-ring model and ellipse model, where the received signal is constructed as a sum of the line-of-sight, single-, and doublebounced rays with different energies. This makes the model sufficiently generic and adaptable to a variety of M2M scenarios (macro-, micro-, and pico-cells). More importantly, our model is the first GBSM that has the ability to study the impact of the vehicular traffic density on channel characteristics. From the proposed model, the space-time-frequency correlation function and the corresponding space-Doppler-frequency power spectral density (PSD) of any two sub-channels are derived for a non-isotropic scattering environment. Based on the detailed investigation of correlations and PSDs, some interesting observations and useful conclusions are obtained. These observations and conclusions can be considered as a guidance for setting important parameters of our model appropriately and building up more purposeful measurement campaigns in the future. Finally, close agreement is achieved between the theoretical results and measured data, demonstrating the utility of the proposed model.