Elena Simona Lohan's Publications List

Multiple Gate Delay tracking structures for GNSS signals and their evaluation with Simulink, SystemC and VHDL

2008-06-03T07:54:46Z

Accurate delay tracking in multipath environments is one of the prerequisites of modern GNSS receivers. Several solutions have been proposed in the literature, both feedback and feedforward. However, this topic is still under active research focus, especially for mass-market receivers, where selection of lowcomplexity, nonpatented methods is preferred. Among the most encountered delay tracking str...

H. Hurskainen, E.S. Lohan, X. Hu, J. Raasakka, J. Nurmi (2008) EURASIP International Journal of Navigation and Observation 2008:

Code Tracking Algorithms for Mitigating Multipath Effects in Fading Channels for Satellite-based Positioning

2008-06-03T08:20:39Z

M.Z.H. Bhuiyan, E.S. Lohan, M. Renfors (2008) EURASIP Journal on Advances in Signal Processing 2008:

Moment-based CNR estimators for BOC/BPSK modulated signal for Galileo/BPSK

2008-06-03T08:02:11Z

Estimation of the Carrier to Noise Ratio (CNR) is one of the most important functionalities of the GPS/Galileo receivers. However, the conventional GPS receivers are not able to satisfy the CNR estimation requirements for the location based services, E-911, and moderate indoor reception. In this paper we derive a total of seven moment based CNR estimators and present the results for the simu...

A.K.M.N. Islam, E. S. Lohan, M. Renfors (2008) WPNC

Acquisition of BOC-modulated signals using enhanced sidelobes cancellation method

2008-06-03T08:09:36Z

The Binary Offset Carrier (BOC) modulation, proposed for future Galileo and GPS M-code signals, provides a high spectral separation from BPSK-modulated signals, such as GPS C/A code. This modulation type introduces new challenges in the delay-frequency acquisition and tracking processes, because it creates multiple peaks in the envelope of the autocorrelation function (ACF). In this paper, ...

A. Burian, E. Laitinen, E. S. Lohan, M. Renfors (2008) ENC-GNSS

On the performance of Multiplexed-BOC (MBOC) modulation for future GNSS signals

2008-06-03T07:57:05Z

Recently, aMultiplexed Binary Offset Carrier (MBOC) modulation has been recommended by the GPS-Galileo Working Group on Interoperability and Compatibility in order to increase the tracking abilities of Galileo Open Service signals and of GPS L1 civil signal. MBOC modulation also ensures a better spectral separation with C/A codes. The purpose of this paper is to analyze the MBOC properties i...

E.S. Lohan, M. Renfors (2007) European Wireless Conference

Analysis of Filter-Bank-Based Methods for Fast Serial Acquisition of BOC-Modulated Signals

2008-06-03T07:48:15Z

Binary-offset-carrier (BOC) signals, selected for Galileo and modernized GPS systems, pose significant challenges for the code acquisition, due to the ambiguities (deep fades) which are present in the envelope of the correlation function (CF). This is different from the BPSK-modulated CDMA signals, where the main correlation lobe spans over 2-chip interval, without any ambiguities or deep fades. T...

E.S. Lohan (2007) EURASIP Journal on Wireless Communications and Networking 2007:

Peak Tracking algorithm for Galileo-based positioning in multipath fading channels

2008-06-03T08:11:27Z

The ever-increasing public interest on location and positioning services has originated a demand for higher performance Global Navigation Satellite Systems (GNSSs). In order to achieve this incremental performance, the estimation of Line-Of-Sight (LOS) delay with high accuracy is a prerequisite for all GNSSs. The Delay Lock Loops (DLLs) and their enhanced variants (i.e., feedback code tracki...

M.Z.H. Bhuiyan, E.S. Lohan, M. Renfors (2007) ICC

Efficient Delay Tracking Methods with Sidelobes Cancellation for BOC-Modulated Signals

2008-06-03T07:49:49Z

In positioning applications, where the line of sight (LOS) is needed with high accuracy, the accurate delay estimation is an important task. The new satellite-based positioning systems, such as Galileo and modernized GPS, will use a new modulation type, that is, the binary offset carrier (BOC) modulation. This type of modulation creates multiple peaks (ambiguities) in the envelope of the correlati...

A. Burian, E.S. Lohan, M. Renfors (2007) EURASIP Journal on Wireless Communications and Networking 2007:

Complex Double-Binary-Offset-Carrier modulation for a unitary characterization of Galileo and GPS signals

2008-06-03T07:39:12Z

E. S. Lohan, A. Lakhzouri, M. Renfors (2006) IEE Proceedings on Radar, Sonar, and Navigation 153: 5 403-408

Binary-offset-carrier modulation techniques with applications in satellite navigation systems

2008-06-03T07:29:40Z

An important aspect in designing the modulation scheme for various satellite systems, such as the modernized GPS and Galileo, is to obtain good spectral properties and suitable spectral shaping. For example, in the future satellite navigation systems, some of the main goals are: low interference with the existing GPS signals, good root-mean-square (RMS) bandwidth, good time resolution (in order to...

E. S. Lohan, A. Lakhzouri, M. Renfors (2006) Wireless Communications and Mobile Computing 7: 6 767-779

Complexity considerations for unambiguous acquisition of Galileo signals

2008-06-03T08:13:50Z

In order to obtain a higher spectral separation from the BPSK-like signals, i.e. GPS C/A code, the signals proposed for future Galileo and GPS M-code signals are processed using split-spectrum type modulations, such as Binary Offset Carrier (BOC) modulation. These BOC modulations create deep fades (ambiguities) in the envelope of the Autocorrelation Function (ACF) of signal, and therefore the ...

A. Burian, E. S. Lohan, V. Lehtinen, M. Renfors (2006) WPNC

BPSK-like Methods for Hybrid-Search Acquisition of Galileo Signals

2008-06-03T08:15:39Z

The Binary Offset Carrier (BOC) modulation which has been proposed for future Galileo and GPS M-code signals, provides a higher spectral separation from BPSK-modulated signals, such as GPS C/A code. The absolute value of the autocorrelation function of a BOC signal has a narrower main lobe, which may increase the resolution of delay estimates, but also presents deep fades, which may lead to ...

A. Burian, E. S. Lohan, M. Renfors (2006) ICC

Feedforward delay estimators in adverse multipath propagation for Galileo and modernized GPS signals

2008-06-03T07:36:13Z

E. S. Lohan, A. Lakhzouri, M. Renfors (2006) EURASIP Journal of Applied Signal Processing :

Spectral shaping of Galileo signals in the presence of frequency offsets and multipath channels

2008-06-03T08:16:52Z

E. S. Lohan, A. Lakhzouri, M. Renfors (2005) IST Mobile & Wireless Communications Summit

Interference and Indoor Channel Propagation Modeling Based on GPS Satellite Signal Measurements'

2008-06-03T08:19:43Z

The Global Navigation Satellite system (GNSS) is experiencing an exponential growth of the consumer segment demand. Many applications emerged after the E-911/E-112 regulations. Positioning needs to be carried out in all the environments covered by the wireless communication services, including the most constraining areas such as obstructed indoor environments. Different techniques have emer...

A. Lakhzouri, E. S. Lohan, I. Saastamoinen, M. Renfors (2005) ION-GPS

Benefits of using lower chip rates for Galileo OS and PRS signals

2008-06-03T08:18:06Z

E.S. Lohan, A. Lakhzouri, M. Renfors (2005) ENC-GNSS

Statistical Properties of Urban WCDMA Channel for Mobile Positioning Applications

2008-06-03T08:07:39Z

The goal of this paper is to report the results of a comprehensive statistical analysis of the urban wireless channels, based on WCDMA eld-measurements data. The applications of our study are in the area of WCDMA-based mobile phone positioning. The target here is the analysis of the Line-of-Sight (LOS) and Non Line-of-Sight (NLOS) situations and of the statistical distributions of their parame...

E. S. Lohan, A. Lakhzouri, M. Renfors (2004) International Journal of Wireless and Optical Communications (IJWOC) 2: 2

Selection of the multiple-dwell hybrid-search strategy for the acquisition of Galileo signals in fading channels

2008-06-03T08:23:12Z

The acquisition of CDMA signals in adverse mobile communication channels has been studied for more than five decades. However, the introduction of new standard proposals for the future European satellite system (i.e., Galileo) and for the modernized GPS has triggered new interest in fast and reliable acquisition strategies for CDMA systems with very high spreading factors (e.g., length of 10...

E. S. Lohan, A. Lakhzouri, M. Renfors (2004) PIMRC

Multipath delay estimators for fading channels with applications in CDMA receivers and mobile positioning

2008-06-03T07:16:01Z

CDMA is the multiple access technique selected for the 3G mobile communications systems and it has a significant role in the research beyond 3G systems. CDMA systems over wireless channels have to cope with fading multipath propagation, which makes the channel estimation an important issue in CDMA receivers. Despite a significant amount of scientific literature on CDMA receivers, there are still o...

E.S. Lohan (2003)

Subchip multipath delay estimation for downlink WCDMA system based on Teager-Kaiser operator

2008-06-03T07:25:51Z

R. Hamila, E.S. Lohan, M. Renfors (2003) IEEE Communications Letters 7: 1 1-3

Performance analysis of the Rake receiver in the presence of multipath delay estimation errors and Rician fading channels

2008-06-03T08:03:43Z

E.S. Lohan, M. Renfors (2003) European Transactions on Telecommunications 2003: 14 435-447

EKF channel estimation for LOS detection in WCDMA mobile positioning

2008-06-03T08:05:37Z

A. Lakhzouri, E.S. Lohan, R. Hamila, M. Renfors (2003) EURASIP Journal of Applied Signal Processing 13: 1268-127