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The paper presents a new wireless communication system using Chirp Spread Spectrum (CSS) transmission. The applied modulation scheme is extended with Pulse Position Modulation (PPM) to transmit data for multiple mobile terminals simultaneously. The proposed system is a Low-Power Wide-Area Network (LPWAN) providing very reliable and robust transmission, especially for terminals moving with high speeds...
LTE/LTE-A systems use pilot or reference signals for channel estimation occupying a significant part of the time-frequency grid. In this paper the efficiency of channel equalization over a flat-fading channel is analysed taking into account the estimation error. Closed form formulas are provided to calculate symbol-to-error ratio depending on the estimation error using QPSK modulation. Then, a trade-off...
New sophisticated solutions are required in next generation networks to provide appropriate quality of service for users. The introduction of small cells in Long Term Evolution (LTE) raises numerous problems along with undoubted advantages to the engineers and researchers. In this paper a new handover decision algorithm is described for two-tier macrocell-small cell LTE-Advanced (LTE-A) using network...
The application of network coding in wireless environment provides a new horizon for throughput enhancement. By means of network coding the throughput of a network can be increased very efficiency. In this paper we use a family of constant dimension subspace codes called lifted rank-metric coding (LRMC) and investigate its performance in a general wireless environment. LRMC process reduces the number...
Extending conventional LTE systems with small cells offer new horizon in mobile communications to provide better coverage and enhance capacity. OFDM-based air interfaces allow sharing this capacity in a very flexible way. MIMO transmitters and receivers introduce significant increase in capacity in exchange of very sophisticated signal processing algorithms. In this paper we present a new system model...
Delivery of multimedia transmission in mobile networks requires appropriate coverage and enough capacity to provide Quality of Service. Femtocell systems can be suitable network components to handle these challenges. State of the art mobile and wireless networks introduce MIMO transmitters and receivers to increase available capacity significantly in exchange of very sophisticated signal processing...
In this paper, we investigate the design issues of microwave measurements employing RF-over-fiber technology. The transmission technology involves the usage of optical modulators to perform amplitude modulation of an optical carrier using the input microwave signal. The modulated carrier is then transmitted through an optical fiber and the microwave signal is reconstructed by demodulating the optical...
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