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Applying interblock memory to binary linear block codes is a method to increase the transmission reliability by increasing the correlation among codewords. In this paper, we consider short block coding with interblock memory. Since short block codes can be efficiently decoded by employing the A∗ Algorithm, we investigate the performance of short block coding with interblock memory using the A∗ decoding...
A low-complexity detection algorithm is proposed for Multiple-Input Multiple-Output (MIMO) systems with many transmit and receive antennas. We involve QR Decomposition (QRD) to triangularize the effective MIMO channel matrix so that several MIMO sub-systems can be individually established, which allow detecting several (possibly overlapping) groups of data streams separately. This method is referred...
We present a predictor for real Body-Area-Network (BAN) channels that is accurate for up to 2 seconds, even with a nominal channel coherence time of 500 ms. The predictor utilizes the partial-periodicity of measured BAN channels using the previous 4 seconds of channel gain values. We demonstrate use of this predictor for power control with open-access and private channel measurements. When used under...
Spectrum sensing is a fundamental feature of cognitive radio technologies facilitating detection and localization of spectrum opportunities. Combined with centralized database storage, it fosters reliable spatial spectrum measurements and Radio Environmental Maps (REMs) construction that can provide an accurate insight in the spectrum utilization over time, space and frequency. The spectrum sensing...
We consider a random access primary network. At the beginning of each time slot, a number of secondary users sense the channel and make an access decision based on the spectrum sensing outcome and the channel state information (CSI). Specifically, the channel is accessed by a secondary transmitter with a probability that depends on both the sensing metric and the gain or signal-to-noise-ratio (SNR)...
In the smart grid, an efficient and reliable communication infrastructure is crucial for improving system efficiency and stability. In this paper, we leverage cognitive radio technology to construct the smart grid communication infrastructure. The proposed network architecture consists of three sub-areas, cognitive Home Area Networks (HAN), cognitive Neighborhood Area Networks (NAN) and cognitive...
In the literature, cooperative relaying and network coding have been used separately in improving performance of wireless MAC protocols. In this paper, we propose a novel scheme that combines both cooperative relaying and network coding for further performance improvement. The proposed scheme considers two challenges of network-coded cooperative MAC operating in a realistic wireless network. First,...
In today's wireless communication systems, automatic repeat request (ARQ) is implemented at the MAC layer in order to retransmit packets that have been erroneously transmitted at the physical (PHY) layer. Following a joint PHY-MAC design, information provided by the ARQ scheme can be exploited at the PHY layer in order to improve the system's performance. This paper extends the work presented in [1]...
Numerous entities in a smart grid network communicate with each other via unicast, multicast, and broadcast communications in order to enhance the efficiency, reliability, and intelligence of the power supply chain. This paper proposes an efficient and scalable key management protocol for secure unicast, multicast, and broadcast communications in a smart grid network. The proposed protocol is based...
In this paper, we study the error exponent of generalized-K fading multiple-input multiple-output (MIMO) channels over Orthogonal Space-Time Block Codes (OSTBC). Error exponent sets ultimate bounds on the performance of communication systems employing codes of finite complexity and has been seen as one of the most significant information theoretic measures of reliability. In this paper, closed-form...
The real-time data dissemination schemes exploit the spatiotemporal communication approach which forwards data at the delivery speed calculated with the desired time deadline and the end-to-end distance in wireless sensor networks (WSNs). However, the schemes do not focus on the reliable communication. Recently, MMSPEED is a well-known scheme for both reliable and real-time data delivery based on...
We present a new co-operative scheduling approach which provides not only more reliability but also higher effective capacity. Cooperation region is defined for active handoff users between two base stations (BSs) based on the user quality-of-service (QoS) requirements. A proper definition of co-operation or handoff region, where the user can be scheduled in a cooperative manner from more than one...
Deployment is a fundamental issue in wireless sensor networks. Usually the sensor locations are precomputed based on a ”perfect” sensor coverage model, whereas sensors may not always provide reliable information, either due to operational tolerance levels or environmental factors. Therefore, it is imperative to have practical considerations at the design stage to anticipate this sensing behavior....
Providing an energy-efficient communication scheme is highly desirable in Wireless Sensor Networks (WSNs), however this is often constrained by the processing and energy limitations of the wireless nodes. In this paper, we propose the use of a Turbo Code scheme to increase the robustness and energy efficiency of the communication between end nodes and base stations in single-hop topologies. Using...
The Temporally-Ordered Routing Algorithm (TORA) is a highly adaptive distributed routing algorithm used in Mobile Ad hoc Networks (MANET) that provides multiple loop-free routes to a destination. TORA is very dependent on the services provided by the Internet MANET Encapsulation Protocol (IMEP) to carry out its three main functions: route creation, route maintenance, and route erasure. In this paper,...
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