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Today, wireless devices generally feature multiple radio access technologies (LTE, WIFI, WIMAX,...) to handle a rich variety of standards or technologies.These devices should be intelligent and autonomous enough in order to either reach a given level of performance or automatically select the best available wireless technology according to standards availability. On the hardware side, system on chip...
In recent wireless networks, end-nodes are capable of detecting the existence of multiple wireless standards. In this context, it becomes very interesting to design an on-line reconfigurable communication system controlled by a Vertical Handover Algorithm (VHA) that allows selecting the best available wireless standard. In this demo, we propose implementing the Partial Reconfiguration (PR) technique...
Recent fixed and mobile wireless communication systems have attracted researchers to propose new techniques and methodologies that greatly improve performance. For example, adaptive techniques have improved the wireless channel efficiency while decreasing the overall power consumption. They consist in reconfiguring parts of the global system automatically according to different parameters. In parallel,...
Field Programmable Gate Array (FPGA) architectures, such as Xilinx's Virtex-4 up to 7 series, have enabled partial and dynamic run-time self-reconfiguration for a long time. This feature enables the substitution of parts of a hardware design implemented on this re-configurable hardware, and therefore makes it possible for a system to adapt to the actual demands of applications. Dynamic Partial Reconfiguration...
This paper presents a performance study of a low power non-coherent multi-band IR-UWB system based on energy detection for future wireless high data rates communications. The studies presented in this paper are based on the statistical multipath model of the UWB channel proposed by the IEEE 802.15.3a task group. A new simple model of the received signal is proposed. The main objective of this model...
This paper presents an architecture of an IR-UWB MB-OOK non-coherent transceiver. Channel measurements performed for both LOS and NLOS short-range communications in real indoor environment based on this realized prototype are provided. A comparison between the use of directional and omnidirectional antennas at both emission and reception is presented. Then, an estimation of the data rate of the communicating...
High Peak to Average Power Ratio (PAPR) is a critical issue in multi-standard and multi-carrier communication systems. This problem can result in large performance degradation due to the non-linearity of the High Power Amplifier (HPA) or in low power efficiency. The Cognitive Radio (CR) is an efficient technology to meet the Green communications concept. In this paper, we study the PAPR reduction...
This paper presents an implementation study of an analog CMOS pulse detector. The detector includes four stages: squarer, current amplification, an integrator and a sample and hold. The main objective is to realize the pulse detection function with less complexity design, low power consumption and low mass fabrication cost. Also, it must operates in the 3.1–10.6 GHz UWB band for a multi-band impulse...
This paper presents an analog circuit aimed at performing pulse detection in the 3.1-10.6 GHz UWB band for MB-OOK high data rates receiver. Low cost and low power consumption are targeted. For that we especially focus on CMOS technology. The proposed pulse energy detector includes three stages: squarer, amplification and integration. Theoretical studies and SPICE simulation results in 0.35 mum CMOS...
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