A novel multipath mitigation technique for Global Positioning System (GPS) receivers using the Expectation-Maximization (EM) algorithm is proposed. It is well-known that conventional propagation delay estimation using parallel sliding correlators is only optimal in additive white Gaussian noise channel. In practical positioning systems, the weak GPS line-of-sight signal is generally embedded in...

Various types of noise inherent in the channel estimation process for a fading multipath channel are examined and modeled. Performance degradation due to noisy channel estimation in the adaptive matched filter receiver is analyzed, and some numerical results-contrasting reference-directed and decision-directed channel estimation-are presented for the troposcatter channel.

This paper presents a novel LoRa (Long Range) receiver operating in frequency selective Multi-Path Channel (MPC). The dechirped received wave-forms under MPC allows us to derive simple and efficient scheme by using MF (Matched Filter) approach that aims maximize the SNR (Signal-to-Noise Ratio) at symbol index of DFT output. We show can be seen as RAKE structure where interference peaks related ...

In this paper we present theoretical data in support of the unified indoor geolocation channel model namely (1) path loss and (2) multipath distribution models. First, the path loss model is currently accepted to be a function of the transmitter and receiver geometry and frequency of operation. Second, the most widely used and accepted indoor channel multipath distribution models are Nakagami w...

This paper investigates the ergodic capacity of multipath channels in the wideband regime with limited feedback. Our work builds on recent results that have established significant capacity gains achievable in the wideband/low-SNR regime, when there is perfect channel state information (CSI) at the transmitter. Furthermore, this benchmark gain can be obtained with just 1-bit of CSI at the trans...

In this paper a parametric method for estimating the unknown multipath channel impulse response (CIR) in a semiblind manner is proposed. The main trait of this method is that instead of seeking the whole CIR sequence, only the unknown time delays and attenuation factors of the physical channel multipath components are estimated. The technique is based on a suitable application of the sub-channe...

In this paper the problem of TOA estimation in multipath channels are discussed. Brief introductions of TOA estimation techniques that can be used to improve the performance in multipath channels are presented. Some simulation results based on channel measurement data in indoor environment is presented to demonstrate and compare the performance of different TOA estimation techniques.