The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A novel Hartley-based Unipolar orthogonal frequency division multiplexing (HU-OFDM) approach is proposed for visible light communication systems (VLC) with dual function i.e. illumination and communication, in which the fast Hartley transform (FHT) is exploited for the modulation/demodulation processing instead of the conventional fast Fourier transform (FFT) to generate real and positive OFDM symbols...
In this paper, we propose a distributed simultaneous localization and tracking (SLAT) algorithm in wireless sensor networks. Belief propagation (BP) algorithm is applied on the factor graph which represents the factorization of the joint posterior distribution function. Due to the nonlinearity between the observations and location variables, closed-form expression of messages cannot be obtained by...
Location information has become a critical requirement for many applications in wireless sensor networks. Conventional localization requires dense anchors with known positions or high transmit power in sparse networks to reach successful localization, which is not suitable for low-cost and low-power sensors. Cooperative localization is a promising solution for wireless sensors' localization, in which...
We consider a wireless network where target nodes aim to locate themselves. A cooperative localization algorithm can provide high accuracy by exchanging location information between nodes. In this paper, a novel distributed cooperative localization algorithm based on factor graph and variational message passing (VMP) is proposed. Compared with other message passing method, VMP algorithm features lower...
In this paper, based on analyzing the detector characteristics of modified Gardner (mGA) timing error detector examined before, an extended non-carrier-blind detector is proposed for quadratic phase shift keying (QPSK) signals. The timing jitter performance of new detector is about 2dB-10dB better than that of mGA at low and high signal-to-noise ratio (SNR) respectively. However, this advantage is...
H.264/AVC significantly outperforms the previous video coding standards at the expense of a higher computational complexity. The complexity is even higher when H.264/AVC is used in applications with high bandwidth and high quality like real-time encoding of HD (High-Definition) video. However, the stream architecture such as STORM processor provides a powerful mechanism to achieve high performance...
In this paper, we present an iterative Markov chain Minimum Bit Error Rate (MC-MBER) detection aided steered Linear Dispersion Coded (LDC) structure, which amalgamates three different Multiple-Input Multiple-Output (MIMO) functions, namely Space-Time Coding (STC), Spatial Division Multiplexing (SDM) and beamforming. Furthermore, the concept of using a novel a priori Log Likelihood Ratio (LLR) threshold...
A modified M&M frequency estimation algorithm for DVB-S2 system is proposed in this paper. This estimator provides a larger estimation range compared to the well known Fitz and L&R methods and achieves CRB in the whole SNR operation range of DVB-S2, with a little increase in computational complexity. The enlarged estimation range will reduce the acquisition time of the coarse frequency synchronizer...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.