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This paper presents an overview of the innovative solutions developed within the Italian project GRETA (GREen TAgs and sensors with ultra-wide-band identification and localization capabilities), whose aim is the development of a distributed and comprehensive system for identification, localization, tracking and monitoring in indoor scenarios. The system is based on hybrid UWB-UHF RFID tags, and the...
In this paper, an efficient preamble designed for the burst mode continuous phase modulation (CPM) signals is proposed. The innovative preamble is based on the combination of a single tone signal and a unique CPM signal. Like the preamble adopted in MIL-188-181B standard, the proposed preamble can estimate the carrier frequency and phase offset, and acquire the symbol timing and frame synchronization...
After ten years of successful deployment, the second generation satellite standard for digital video broadcasting, DVB-S2, has been updated to include very low signal-to-noise ratio modes to better support mobile and very small terminal applications without changing its fundamental structure. This paper provides a high level discussion on several of the most important aspects of the updated standard.
The basic idea of the “Tower Overlay over LTE-A+” system (TOoL+) is to offload popular services, especially live video, from cellular networks, thereby decreasing the operational cost of such networks. This can be realized by using High Tower High Power (HTHP) transmitters whose signals can be seen as an overlay to the cellular networks. For the integration of HTHP signals into the cellular networks,...
The digital Private Mobile Radio (dPMR) is a standard for digital trunked system which is proposed by European Telecommunications Standards Institute (ETSI). The protocol describes the Physical Layer (PL), the Data Link Layer (DLL) of Air Interface (AI), and the standardized services and facilities of the mobile radio. In this paper, we propose a Digital Base-band (DBB) processing unit, including...
In this paper, we derive the Cramer-Rao bound (CRB) for shaped offset quadrature phase keying (SOQPSK) signals. We consider a situation where the carrier phase, frequency offset and symbol timing have to be estimated based on a known training sequence. The goal is to find the optimum training sequence for which the joint CRBs are minimized. It is shown that the proposed training sequence minimizes...
Three applications in wireless networks where model-free stochastic learning is applicable, are discussed. The learning based optimization problems are formulated and simulation results are presented. Some open issues are also discussed.
Effects of improved channel estimation are studied for a proposed IEEE 802.11n OFDM MIMO system. Three channel estimation methods are considered: maximum likelihood (ML), time-domain truncation (TDT) and model-based (MB). TDT and MB are particularly useful when the channel delay spread is short. For an MMSE receiver, MB shows a 1-2.5 dB improvement over ML on the packet error rate performance for...
Correlative minimum shift keying (MSK), a second order polynomial modulation scheme known as tamed frequency modulation (TFM), is a constant envelope type of modulation with a perfect peak to average power ratio (PAPR), besides the property of low out of band power. We apply the linearized TFM to the single carrier transmission with frequency domain equalization (SC/FDE) concept. We then obtain a...
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