Extracting specular-diffuse clusters from MIMO channel measurements

Abstract

In previous work, it has been observed that the specular and the diffuse component are linked in the angular domain. The idea of adding a diffuse component to each specular cluster has been proposed to model the speculardiffuse channel. In this paper, an approach is proposed to treat the specular and the diffuse measurement data simultaneously, with a clustering algorithm that is applied jointly on the specular and the diffuse component. The output of the clustering algorithm gives clusters that are characterized by their specular and their diffuse component. Measurement results are presented based on double-directional measurements, and parameter values are extracted using the proposed methodology.

Directional Spreads of Dense Multipath Components in Indoor Environments: Experimental Validation of a Ray-Tracing Approach

“…The spectrum of the DMC in the joint transmit/receive angular and delay domains was then extracted using Bartlett's beamforming [13], [14].…”

“…Naturally, the angular spreads can be calculated for the specular components by considering the specular MPCs, for the DMC by considering the discrete bins of the direction-delay diffuse spectrum [14], and for the global channel by considering the specular MPCs and the diffuse bins simultaneously [14].…”

A Survey of Dense Multipath and Its Impact on Wireless Systems

“…Modeling approach Type [45] A VMD in angular domain and a linear (angular independent) model for the polarisation domain Stochastic model [4], [11] A single exponential decay in the time-delay domain Stochastic model [14], [20] An exponential decay in the time-delay domain, VMD in angular domain Stochastic model [17], [18] An exponential decay in the time-delay domain, VMD in angular domain Stochastic model [19] A VMD and an additional uniform distribution in angular domain Stochastic model [21], [46] A unimodal VMD and a multimodal VMD in angular domain, an angle-independent polarization vector Stochastic model [47] VMD in angular domain Stochastic model [48] Clusters based model, VMD in angular domain, an exponential decay in time-delay domain Stochastic model [49] Clusters based model, a Fisher-Bingham spectrum in the azimuth-coelevation domain, an exponential decay in time-delay domain Stochastic model [50] Clusters based model, an exponential decay in time-delay domain Stochastic model [22], [28] Multichannel autoregressive model Stochastic model [23] Autoregressive moving average model Stochastic model [51] Moving average model Stochastic model [52] Multidimensional discrete prolate spheroidal sequences geometry-based stochastic channel model (GSCM) [53], [54] Classical GSCM approach GSCM [55] Clusters based model, VMD in angular domain, an exponential decay in time-delay domain, GSCM GSCM [56] Ray-optical wave propagation modeling Deterministic model [57] Ray-launching based model Deterministic model [58], [ The Lambertian model and the directive model, RT tools Deterministic model [81] A phase evolution modeling approach based on ER model Deterministic model [82] A semi-deterministic graph model base on ER approach Hybrid deterministic and stochastic models [83] Point clouds and physical optics Hybrid deterministic and stochastic models [84], [...…”

“…In [50], the DMC is modeled as a superposition of seven clusters, each consisting of one SC and one DMC. Table 2 summaries the cluster-based DMC modeling methods.…”

Parameterization of a Polarimetric Diffuse Scattering Model in Indoor Environments

“…The DMC impulse response matrix was obtained by subtracting the contribution of the specular multipaths evaluated using the SAGE high-resolution algorithm, from the measured impulse response matrix. A detailed description of this approach can be found in [4], [12]. The outcomes of this procedure are, for each ray, its delay/angles of arrival and its antenna de-embedded polarization matrix, the latter being defined as: (5) where is the complex transfer function of the considered ray for two orthogonal linear polarization states and .…”