Positioning in a Multipath Channel Using OFDM Signals with Carrier Phase Tracking

In developing a high accuracy terrestrial radio navigation system, as a complement to a global navigation satellite system (GNSS), it is recognized that the performance of time delay estimation is proportional to, and thereby limited by, the signal bandwidth. Given a possibly narrow signal bandwidth, the central carrier phase can,...

Sparse Signal Bands Selection for Precise Time-based Ranging in Terrestrial Positioning

Time-based ranging accuracy is inversely proportional to the signal bandwidth. A larger the signal bandwidth leads to a higher accuracy of time delay estimation, but more complex hardware is needed. Alternatively, we explore the idea of using multiple narrow signal bands (e.g., 10 MHz of each) to create a large virtual signal bandwidth, which...

Identifying time-varying channels with aid of pilots for MIMO-OFDM

In this paper, we consider pilot-aided channel estimation for orthogonal frequency division multiplexing (OFDM) systems with a multiple-input multiple-output setup. The channel is time varying due to Doppler effects and can be approximated by an oversampled complex exponential basis expansion model. We use a best linear unbiased estimator (BLUE)...

System Design for a High Data Rate Wireless Infrared Multi language Distribution system

This thesis investigates the feasibility of high speed wireless communication for an infrared multi language distribution system and concludes that data rates near 20Mbps are practical. We identify the impediments to high speed communication, namely, multipath dispersion and weak frond-end design and propose different strategies to counter them....

Shifted Known Symbol Padding for Efficient Data Communication in a WLAN Context

To allow for a computationally efficient equalization scheme for the frequency-selective transmission channels encountered in wireless local area network (WLAN) applications, cyclic prefix (CP) block transmission schemes have been proposed, such as single-carrier CP (SC-CP) and multi-carrier CP (MC-CP) transmission, also known as orthogonal...

An Outdoor HIPERLAN Simulator

In outdoor wireless LAN’s the large delay spread is a severe problem. There are different techniques to combat the large delay spread, namely: • multicarrier modulations • equalization • diversity • multilevel modulations In this report a simulator is described to analyze the performance of different techniques.

An Analytical Performance Evaluation of a Coded OFDM-Based Transmission Scheme, using a Markov Model for a Frequency Selective Channel

In this report the performance of an error-correcting code on a wide-band frequency selective Rayleigh fading channel with an OFDM- based transmission scheme is estimated by means of an analytical model. In the European dTTb project, a transmission scheme for a new digital terrestrial TV system is under development. This scheme uses OFDM to...