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In this paper, a novel timestamp-free synchronization algorithm is proposed where no dedicated timing messages are exchanged; the synchronization algorithm is embedded in the existing network messages. The proposed algorithm is intended for networks where many messages are transferred from the sensor to the central communication node, but only a few messages are transmitted from the central communication...
Conventional blind joint symbol time offset (STO) and carrier frequency offset (CFO) estimators for orthogonal frequency division multiplexing (OFDM) systems are high in computational complexity, which increases power consumption and reduces the lifetime of the communications device. In this paper, a novel, real-time, low complexity, blind, and adaptive synchronization algorithm for OFDM systems is...
For orthogonal frequency division multiplexing (OFDM) receivers, the mutual orthogonality of the subcarriers is preserved only if the estimated symbol timing error lies in the lock-in region. Conventionally, a bias is added to the coarse symbol time offset (STO) estimate to move the symbol timing error into the lock-in region, thus increasing the lock-in probability. Upon review of the literature,...
A novel blind time and frequency offset estimator for orthogonal frequency division multiplexing (OFDM) systems is presented. The estimator exploits a basic assumption of OFDM: the channel order is less than or equal to the length of the cyclic prefix. Under this assumption, it is shown that the last sample of the received cyclic prefix is not corrupted by intersymbol interference and this sample...
Location estimation in wireless communications systems experiencing purely non-line-of-sight propagation paths is an open problem. In this paper, a novel least squares algorithm is presented to estimate the location of a mobile station (MS) experiencing purely non-line-of-sight communication with at least one base station (BS) by using the time of arrival (TOA), angle of arrival (AOA), and Doppler-shift...
For orthogonal frequency division multiplexing (OFDM) receivers, the mutual orthogonality of the subcarriers is preserved only if the estimated symbol timing error lies in the lock-in region. This paper is the first to investigate adding a bias to coarse symbol time offset estimators, and analyze its performance in terms of the lock-in probability. The optimal value of the bias term is derived for...
Previously proposed non-data-aided time delay and carrier frequency offset estimators typically require multiple orthogonal frequency division multiplexing (OFDM) symbols to achieve good estimation performance, which is not well-suited for positioning, navigation, and timing (PNT) applications in which fast acquisition time is critical. In this paper, a novel non-data-aided joint time and frequency...
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