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.
The Nakagami-m fading is well known in characterizing the envelop distribution in diverse wireless fading channels, and an accurate estimation of the m parameter is very crucial to evaluate the fading channel capacity. In this paper, we develop a hardware framework implanted in FPGA with corresponding interface design for the m parameter estimation of the Nakagami-m fading channel. Owing to the advantages...
In this paper, we propose a simple procedure to construct (decodable) good codes with any given alphabet (of moderate size) for any given (rational) code rate to achieve any given target error performance (of interest) over the additive white Gaussian noise (AWGN) channels. We start with constructing codes over groups for any given code rates. This can be done in an extremely simple way if we ignore...
This paper investigates the iterative decoding for spectrally efficient two-way relay (TWR) communications in which two end nodes exchange information through a relay (R). With the use of physical-layer network coding (PNC), information exchange throughput can be significantly improved as only two orthogonal time slots (TS) are required to realize both the multiple access (MAC) and the broadcast (BC)...
In this paper, we examine the channel estimation in an amplify-and-forward (AF) one-way relay network (OWRN) under time selective flat fading scenario, where the distributed space-time coding (DSTC) is adopted at relay nodes. Our target is to estimate and track the individual channels of each relay hop instead of the composite channels. To reduce the number of the channel parameters to be estimated,...
In this paper, we consider a typical high speed train (HST) communication system with single-input multiple-output (SIMO) orthogonal frequency-division multiplexing (OFDM). We show that the inter-carrier interference (ICI) caused by large Doppler shifts can be mitigated by exploiting the train position information as well as the sparsity of the basis expansion model (BEM) based channel model. For...
Generalized signal alignment (GSA) is recently proposed as a new transmission framework to achieve the maximum degrees of freedom in multi-user MIMO two-way relay channels. In this paper, we apply GSA in high mobility OFDM systems. To handle the inter-carrier interference (ICI) resulted from large Doppler frequency shift effectively, we propose subcarrier extension (SE)-GSA. Its idea is to treat each...
The special communication scenario in High-Speed Train (HST) not only leads to an increasing demand of high throughput and continuous multimedia services but also arises many other challenges for cellular network access technology, such as high mobility, frequent and group handovers etc. In order to address above problems, we propose an HST WiFi network application scheme which adopts multi-hop technology...
A compensation-based user scheduling (CBUS) for multiuser multi-input multi-output (MU-MIMO) systems with delayed feedback channel state information (CSI) is proposed. To cope with the great performance degradation caused by imperfect CSI in the selective transmission/ selective combining (ST/SC) transceiving systems, we propose the CBUS algorithm, which can effectively alleviate the effect of time...
The booming development of high speed railway (HSR) in recent years triggers a rapidly growing demand of high-quality wireless communication, which at the meantime motivates great research interest in providing a reliable and high data rate wireless communication in high speed scenarios. To continuously explore the nature and character of HSR scenario, this paper mainly aims to investigate the reliability...
In the field of ISI-free region detection, few attention was received on the threshold's optimization. In this paper, a sub-optimal analytical solution is introduced for choosing the threshold in high-mobility fading channels based on 1-norm distance, which was suggested to improve the detection accuracy and the computational complexity. Further more, based on the sub-optimal threshold, the 1-norm...
Due to tunnels, mountains, corridors and other geographical features as well as their high mobility, high speed train users may experience different channel fadings on two or more antennas mounted on the top of the train, varying in time and location. The switching rates of dual selection combining diversity and dual switch-and-stay diversity for the mixed Nakagami-m and Rician fading are investigated...
In high mobility environments, the significant Doppler shift introduces severe inter-carrier interference (ICI) to an orthogonal frequency-division multiplexing (OFDM) system, which makes channel estimation very challenging. In this paper, we propose an efficient structured distributed compressive sensing (SDCS) based joint channel estimation scheme within multiple OFDM symbols. By utilizing the complex...
The focus of this paper is coded orthogonal frequency division multiplexing (OFDM) system for high-speed railway wireless communication based on block Markov superposition transmission (BMST). The effect of Doppler spreading destroys the orthogonality among subcarriers, resulting in intercarrier interference (ICI) in the OFDM systems. In order to mitigate the ICI and get the soft information easily,...
In time-varying wireless channels, the radio signals suffer from time-varying fading which may cause severe signal attenuation. In this paper, we present a new approach, called block Markov superposition transmission (BMST) over real field, to obtain diversity which increases the transmission reliability under the fading channels. The proposed scheme is similar to BMST over binary field, which has...
A practical rateless coding framework for the half-duplex decode-and-forward (DF) relay channel is proposed in this paper. Rateless spinal codes are employed as the basic coding strategy in our coding framework and a cooperative decoder for the destination is proposed. Moreover, by introducing the concepts of equivalent code and equivalent channel, we prove that the proposed coding framework is capable...
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.