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.
We derive for the first time closed-form expressions for the Cramér-Rao lower bounds (CRLBs) of the joint channel phase, and carrier frequency offset (CFO) estimates from turbo-coded (TC) Pulse-amplitude modulation (PAM) and rectangular-QAM (RQAM) modulated signals over flat-fading channels. After wisely exploiting the properties of Gray mapping, we are able to simplify the log-likelihood...
Simultaneous bidirectional transmission and recep- tion of signals on a single channel in a full duplex (FD) system is gaining increased attention from both academia and industry. Recent advances in radio transceiver design have been able to minimize the self interference (SI) to a great extent making realization of a FD transceiver possible. For FD deployment in a multi-cell environment, minimizing...
In a spectrum-sharing heterogeneous network (HetNet), low-power cells such as femtocells are deployed jointly with macrocells, thereby generating interference. To tackle this critical issue in HetNets, we advocate a new interference mitigation concept that combines uncoordinated use of both interference cancellation and interference avoidance at the receiver and transmitter sides, respectively, to...
Three main distributed collaborative beamforming (DCB) designs based on different channel models could be employed in real-world applications where scattering and implementation imperfections might exist: the monochromatic (i.e., single-ray) DCB (M-DCB), the bichromatic (i.e., two-ray) DCB (B-DCB), and the polychormatic (i.e., multi-ray) DCB (P-DCB). In this paper, we perform an analytical comparison,...
In a spectrum-sharing heterogeneous network (Het- Net), low-power small cells such as femtocells are deployed jointly with macrocells. This new cell layer generates interference that degrades network performance. To mitigate this critical issue in HetNets, we combine both interference cancellation and interference avoidance to benefit from their respective advantages on the downlink of LTE (Long Term...
In this paper, we propose a new single-input multiple-output (SIMO) context-aware cognitive transceiver (CTR) that is able to switch to the best performing modem in terms of link-level throughput and allows to decrease macro transmission power without loosing performances comparing to the conventional Data-aided Least Squares (DA LS) channel estimator. On the top of conventional adaptive modulation...
Coherent detection requires accurate channel estimation to provide the high data rates promised by the LTE standard. However, for high-speed wireless data transmission services, channel estimation becomes a challenging task when the pilot insertion rate becomes insufficient to allow proper tracking of the channel variation. In this paper, we design a new singleinput multiple-output (SIMO) context-...
Deploying small cells (pico, femto or relays) in a macro-cell network is an advantageous solution to increase system capacity. However, small cells usually transmit with a weaker power compared to macro-cells, this fact causes a serious interference problem for these former. Range Expansion technique is among the solutions proposed to overcome this problem. The idea is to bias the received signal...
In this paper, we consider a heterogenous small-cell network (HSCNet) with co-channel deployment and investigate the throughput performance of the proposed admission control algorithm based on a new received interference constraint at the small-cell base station (SCBS) nodes. In the considered co-channel heterogenous network, by utilizing the proposed admission algorithm based on the amount of received...
In this work, we significantly increase the peak rate of the wideband CDMA spatio-temporal array-receiver (STAR) by enabling its operation with high-order modulations (HOM) up to 256QAM (i.e., peak rate of 768 Kb/s per spreading code with 32 spreading factor and 1/2 coding rate in 5 MHz). In order to allow an effective rate control for adaptive modulation and maximize throughput with the resulting...
In a heterogeneous network (HetNet), femtocells are deployed jointly with macrocells. This new cells' layer added to the network generates interference which would hamper neighboring macro user equipment (MUE) and femto user equipment (FUE) transmissions. In fact, this interference results in degradation of the network performance. In this paper, we propose a downlink interference cancellation (DL-IC)...
Three main collaborative beamforming (CB) designs based on different channel models could be applied in real-world environments where local scattering and implementation imperfections might exist: the optimal CSI-based CB (OCB), the conventional or monochromatic (i.e., single-ray) distributed CB (M-DCB), and the recently developed bichromatic (i.e., two-ray) distributed CB (B-DCB). In this paper,...
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.