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The paper presents a testbed for Wireless Sensor Networks (WSN) located at Universidad del Norte in Barranquilla Colombia, created for testing different communication protocols in a real scenario with non-line of sight (NLOS) links and interference. The testbed uses XTend RF Modules at 900MHz, with 1 mW transmission power, and covers an area of 11,000 m2. Results show that the testbed has propagation...
This paper investigates suitable topology management strategies for a two-hop beyond next generation mobile broadband network, in order to substantially reduce energy consumption at low traffic levels. The energy model is introduced here. Several rules are proposed which are based on both traffic load and behaviour of adjacent nodes. A balance between energy saving and required Quality of Service...
We consider an orthogonal frequency-division multiplexing (OFDM)-based downlink transmission scheme for large-scale multi-user (MU) multiple-input multiple-output (MIMO) wireless systems. In order to transmit signals with low peak-to-average (power) ratio (PAR), we propose to exploit the massive degrees-of-freedom available in large-scale MU-MIMO-OFDM systems. Specifically, we jointly perform MU precoding,...
In this paper, we study the impact of RF-front end nonlinearity on the performance of wireless sensor networks (WSN). More specifically, we investigate the problem of interference caused by intermodulation between in-band interferers. We analyze this problem using an enhanced model of signal-to-interference-and-noise ratio (SINR) that includes an interference term due to intermodulation. Using a WSN...
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