Multipath is undesirable for Global Navigation Satellite System (GNSS) receivers, since the reception of multipath can create a significant distortion to the shape of the correlation function leading to an error in the receivers’ position estimate. Many multipath mitigation techniques exist in the literature to deal with the multipath propagation problem in the context of GNSS. The multipath st...

In this extended abstract we present a Bayesian estimation method applicable on single-input multiple-output radio channels. In addition to specular multipath components (MPC) also the parameters of a stochastic process are estimated that comprises non-resolvable dense multipath. Exploiting the hierarchical tree structure of a Bayesian graphical model, the parametric channel estimator is able t...

Double-directional is the feature of propagation that is utilized in multiple-input multiple-output (MIMO) systems with antenna arrays at both ends of the radio link. This contribution discusses which information can be derived from measured/estimated directions of arrival (DOAs) and directions of departure (DODs), and establishes a new parameter describing the multipath spread from both linken...

model, a RAKE receiver can be used to detect the signal from the multipath fading channel. the tap weights were assumed known when deriving RAKE receiver, but in practice a correlator is used to estimate the tap weights. Multipath fading is one of the major practical concernS in communications. Multipath problem always exists in mobile environment, especially for m~ bile unit which is often emb...

The principle objective of this work is to enhance the knowledge about channel estimation and to compare the existing channel estimation techniques under different channel conditions. Normally the received signal is corrupted by the channel (Multipath, ISI). The estimation of a time-varying multipath fading channel is a difficult task for the receiver. Its performance can be improved if an appr...

The IEEE 802.15.3a standards body has developed a modification of the Saleh–Valenzuela (SV) multipath channel model as the accepted channel model for ultra-wideband (UWB) investigations. The SV model is a well-defined simulation model that is straightforward to implement. However, since the model as specified is not directly amenable to theoretical analysis, it is constructed here as a two-dime...

This paper introduces the concept of characterisation of the mobile multipath channel in real time, using a model of the channel based on processes which vary more slowly than the channel itself. A key application of the concept is channel prediction. Some of the key constraints on the range of accurate channel prediction are presented. In particular, the number of paths comprising the multipat...

Multipath is today still one of the most critical problems in satellite navigation, in particular in urban environments, where the received navigation signals can be affected by blockage, shadowing, and multipath reception. Latest multipath mitigation algorithms are based on the concept of sequential Bayesian estimation and improve the receiver performance by exploiting the temporal constraints...

one of the most effective techniques to mitigate multipath fading and inter-cell interference at a downlink wireless channel in wcdma systems for achieving high capacity is transmitter power control. in this case, system increases the power of the subscriber when its interference increases in order to satisfy the requested signal qualities. however, when the requested signal qualities are infea...

This paper presents a joint time-delay and channel estimator to assess the achievable positioning performance of the Long Term Evolution (LTE) system in multipath channels. LTE is a promising technology for localization in urban and indoor scenarios, but its performance is degraded due to the effect of multipath. In those challenging environments, LTE pilot signals are of special interest becau...