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Security is a major concern in wireless sensor networks deployed in hostile environments and localization protocols are also prone to attacks. In this paper we evaluate some robust range-based and range-free localization algorithms in terms of their resilience to attacks carried out by malicious beacons that try to deceive the localization process by providing incorrect location references. Simulations...
In this paper, the application of multisine signals to the frequency-response measurement of switching converters is addressed. It makes some considerations on the available parameters of the signal and its influence on the measurement. The experimental set-up, where a boost converter is considered due to its well known non-linear effects, is described. Additionally, several experimental results are...
This paper presents a tracking scheme for residual frequency offset (RFO) affecting a digital video broadcasting (DVB-T) system. Comparisons of the algorithm with two previously reported estimators in terms of mean square error (MSE), complexity and convergence are performed. The proposed scheme improves performance and convergence while reduces the computational complexity.
Tracking of the carrier frequency offset (CFO) is a crucial issue in the implementation of OFDM systems. Several tracking schemes have been proposed for the 802.11a (WiFi) or DVB-T standards, but almost no frequency tracking studies are available for the more recent 802.16-2004 (WiMAX) wireless communication standard. This work adapts two known tracking techniques, a classic pilot-based scheme and...
Synchronization of the carrier frequency offset (CFO) is a crucial issue in the implementation of orthogonal frequency division multiplexing (OFDM) systems. Several estimation techniques for frequency offset have been proposed in the literature but varied test conditions make comparison difficult. This paper compares different synchronization algorithms for the wireless communication standard IEEE...
In this paper we address the implementation in FPGAs of a multiple-input multiple-output (MIMO) decoder embedded in a prototype of a 4G mobile receiver. This MIMO decoder is part of a multi-carrier code-division multiple-access (MC-CDMA) radio system, equipped with multiple antennas at both ends of the link, that is able to handle up to 32 users and provides raw transmission bit-rates up to 125 Mbps...
In this paper we address the implementation on FPGAs of a 4G equaliser for a multiple-input multiple-output (MIMO) receiver. It is embedded in a multi-carrier code-division multiple-access (MC-CDMA) radio system, which is able to handle up to 32 users and provide transmission bit-rates up to 125 Mbps. We provide details on decisions taken for the design of the signal processing algorithm, including...
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