This document reports on a carefully designed set of fixed and mobile reception tests in Mexico City on the DRM (Digital Radio Mondiale) system at a frequency in the uppermost shortwave broadcasting band – around 26 MHz – for local broadcasting. The testing was done during July 2005. These were not operational tests; that is, neither the transmitter antenna, nor antenna location, nor transmitte...

Multipath is detrimental for both GPS positioning and timing applications. However, the benefits of GPS multipath for reflectometry have become increasingly clear for soil moisture, snow depth, and vegetation growth monitoring. Most multipath forward models focus on the code modulation, adopting arbitrary values for the reflection power, phase, and delay, or they calculate the reflection delay ...

Existing navigation services, such as GPS, offer no signalintegrity (anti-spoof) protection for the general public, especially not with systems for remote attestation of location, where an attacker has easy access to the receiver antenna. With predictable broadcast signals, the antenna can be replaced with a signal generator that simulates a signal as it would be received elsewhere. With a symm...

This paper first identifies a flaw in the proof of the convergence theorem of Algorithm 2 of the paper by Jindal et al. [“Sum power iterative water-filling for multi-antenna Gaussian broadcast channels,” IEEE Trans. Inf. Theory, vol. 54, no. 4, pp. 1570–1580, Apr. 2005] and then presents a corrected convergence proof for that algorithm.

In this paper, we address the high SNR regime of the MIMO broadcast channel under linear filtering. For systems where the base station is equipped with more antennas than the user terminals have in sum, we prove that block-diagonalization is the asymptotically optimum transmission strategy for maximizing the sum rate. For this type of transmission strategy, the asymptotically optimum transmit c...

In a multiple antenna system with two transmitters and two receivers, a scenario of data communication, known as the X channel, is studied in which each receiver receives data from both transmitters. In this scenario, it is assumed that each transmitter is unaware of the other transmitter’s data (non-cooperative scenario). This system can be considered as a combination of two broadcast channels...

A smart antenna for mobile applications incorporating an array of ± 45 polarised stacked patch elements 4 columns wide excited by a multi-beamforming and beam shaping network is described. Four narrow overlapping beams, one wide “broadcast channel” beam and right and left shaped beams can be provided. The later shaped beams are to provide high capacity coverage in a specific narrow angular sect...

Within this thesis, the satellite broadcast scenario of geostationary satellites is reviewed. The densely crowded geostationary arc in the common broadcast frequencies may create significant interference from adjacent satellites (ASI). The possible use of multiple-input receivers and of interference processing techniques is analyzed in this specific context. In addition the synchronization prob...

A simple signaling method for multi-antenna broadcast channels is proposed. This method converts the interference matrix – but not necessarily the channel matrix – to a lowertriangular form. Dirty paper coding is used to cancel the remaining interference. The proposed scheme offers several desirable features in terms of: (i) accommodating users with different number of receive antennas, (ii) pr...