We study the fundamental problem of frequency estimation under both privacy and communication constraints, where data is distributed among k parties. consider two application scenarios: (1) one-shot, static aggregator conducts a one-time computation; (2) streaming, each party receives stream items over time continuously monitors frequencies. adopt model multiparty differential (MDP), which more...

A time-domain algorithm has been described for carrier frequency estimation in Fixed Broadband Wireless Access OFDM systems. It has been evaluated in two different radio frequency bands, in the 5.8 GHz band under Non Light of Sight (NLOS) conditions and in the 10.5 GHz band under LOS conditions. It makes use of a novel preamble structure that gives an averaging enhancement and allows carrier fr...

In this paper, we present a new class of blind cyclic-based estimators for carrier frequency offset and symbol-timing error estimation of orthogonal frequency-division multiplexing (OFDM) systems. The proposed approach exploits the properties of the cyclic prefix subset to reveal the synchronization parameters in the likelihood function of the received vector. In this paper, a new likelihood fu...

This paper suggests parameter estimation and error reduction scheme in a multicarrier transmission system. A multicarrier orthogonal frequency division multiplexing (OFDM) signal by using a time-domain spreading (TDS) coupled with a cyclic time shift enables a pilot-less synchronization. Exploiting the modified OFDM signal endowed with the TDS, the proposed synchronization receiver can accurate...

In this letter, pilot-assisted adaptive prediction iterative channel estimation in frequency-domain is presented for the antenna diversity reception of orthogonal frequency division multiplexing (OFDM) signals. A frequency-domain adaptive prediction filtering is applied to iterative channel estimation for improving the tracking capability against frequency-domain variations in a severe frequenc...

Seismic waves are filtered as they pass through soil layers, from bedrock to surface. Frequencies and amplitudes of the response wave are affected due to this filtration effect and this will result in different ground motion characteristics. Therefore, it is important to consider the impact of the soil properties on the evaluation of earthquake ground motions for the design of structures. Soil ...

Frequency synchronization in GSM/EDGE includes Frequency Burst (FB) detection and FB tone frequency estimation. This paper focuses on the FB frequency estimation, which is the frequency estimation from a single-tone signal. Different from conventional suboptimal solutions, the solution described in this paper is based on optimal Maximum Likelihood (ML) estimation with a sequence of efficient im...

This paper proposes two frequency offset estimation algorithms for the uplink of an Interleaved Frequency-Division Multiple-Access (IFDMA) system. One algorithm performs estimation in the frequency domain and the other in the time domain. Both algorithms are based on the maximum likelihood estimation (MLE) principle and use knowledge about pilot symbols. IFDMA utilizes a block-interleaved frequ...

abstract this research evaluates climate change effects on drought severity in the region of gharesou, iran. the standardized precipitation index (spi) has been used for estimation of drought severity. a geographical information system is applied for calculating the mean areal precipitation time series from 11 meteorological stations, in and out of the area for the hydrological period jan 1971-...