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This paper presents a novel Long Term Evolution (LTE) mobile wireless testbed for streaming multimedia Quality of Experience (QoE) experimentation. The software-radio based design of the testbed provides an extremely flexible architecture which offers detailed insights into all elements of the entire LTE network protocol stack from physical to application layer. With the testbed, we aim to bridge...
Orthogonal frequency division multiplexing (OFDM) systems suffer from large out-of-band (OOB) emissions. These OOB emissions are undesirable and may cause harmful interferences to adjacent channels (users). In this paper, we investigate the ability of combining two OOB emissions reduction techniques (the advanced subcarrier weighting (ASW) and the advanced cancellation carriers (ACC) techniques)....
The concept of cancellation carriers (CCs) has been proposed in the literature for sidelobe suppression for orthogonal frequency division multiplexing (OFDM) systems. Subcarriers at the edges of the OFDM spectrum are used for sidelobe reduction while the remaining subcarriers are used for data transmission. Existing CCs techniques require performing complex optimization that should be applied for...
The concept of subcarrier weighting (SW) has been proposed in the literature for sidelobe suppression for OFDM systems. Each OFDM subcarrier is multiplied with a real-valued weight that is determined in order not to interfere with adjacent users. The problem with the SW technique is involving a very complex optimization that has to be performed for each OFDM symbol which limits the suitability for...
In dynamic spectrum access (DSA) networks, users are allowed to access the available spectrum while keeping neighboring transmissions not interfered. In this demonstration, we show how the available bandwidth can be used efficiently while at the same time keeping the interference power level below a certain threshold. This is done through the use of the constellation expansion technique for orthogonal...
High peak-to-average power ratio (PAPR) is one of the major issues in practical orthogonal frequency division multiplexing (OFDM) transmissions. Due to high PAPR and power amplifier nonlinearity, it is typical to observe an increase in the out-of-band (OOB) interference caused by the OFDM transmissions and the bit-error rate at the receiver. The dynamic spectrum access system in this demonstration...
In dynamic spectrum access networks (DySPANs), users share access to available spectrum while minimizing the likelihood of harmful interference. In this demonstration we present a dynamic spectrum access network which employs a reconfigurable orthogonal frequency-division multiplexing (OFDM) based waveform. In order to avoid the creation of harmful interference, the out-of-band (OOB) emissions of...
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