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This paper aims to evaluate crossed timeslot interference (CTI) in LTE TDD and its mitigation scenarios. The performance degradation of LTE TDD system due to the CTI is evaluated in terms of throughput and bit error rate (BER). This paper simulates and evaluates two mitigation scenarios. Simulation results show that system performance degrades significantly due to the CTI. The first mitigation scenario...
Wireless Nanosensor Networks (WNSNs), i.e., networks of miniaturized devices with unprecedented sensing capabilities, are at the basis of transformative applications in the biomedical, environmental and industrial fields. Recent developments in plasmonic nano-antennas point to the Terahertz (THz) band (0.1–10 THz) as the frequency range of communication among nanosensors. While this potentially enables...
Ambient noise not only influences the data transmission but also causes incorrect CSI. To overcome the low SNR problem, traditional methods usually retransmit the same packet for enough times to increase the SNR. Unfortunately, recently works only focus on the failed data retransmission, yet totally overlook the incorrect channel estimation, which are not efficient for multi-user MIMO WLAN. As long...
VANET (Vehicular Ad-Hoc Network) is an optimistic approach to present safety and other applications to the clients and it is the key module of the intelligent transport system. In this paper, Grayhole attack is mitigated with respect to VANET. The prevention is done through Genetic Algorithm. Genetic Algorithm produce solutions to optimization problems by means of techniques stimulated by natural...
In the world of telecommunication, demand for 3G mobile communication services still dominates the global market. It continues to grow despite the introduction of new technologies such as LTE and LTE-A. Hybrid Automatic Repeat Request (HARQ) and Adaptive modulation and coding (AMC) are among the key performance enhancing techniques adopted in High Speed downlink packet access (HSDPA). Limiting the...
The recently approved IEEE 802.11ac WLAN standard has dramatically boosted Wi-Fi capabilities through supporting more data streams, larger bandwidth and more efficient frame-aggregation, leading to significantly higher data rates. The multitude of data rates and MIMO configurations to choose from has made it crucial to develop efficient algorithms for rate adaptation and MIMO mode selection (spatial...
Non-Orthogonal Multiple Access (NOMA) is considered as a promising downlink Multiple Access (MA) scheme for future radio access. In this paper two power allocation strategies for NOMA are proposed. The first strategy is based on channel state information experienced by NOMA users. The other strategy is based on pre-defined QoS per NOMA user. In this paper we develop mathematical models for the proposed...
In this contribution, we present the Bit Error Rate characteristics for an indoor, wideband body-to-body channel between two firefighters when using IEEE 802.11 ac, which is proven a very suitable standard for future, wideband public safety networks. Moreover, the BER and throughput characteristics, when applying both transmission blocking, fixed and adaptive, subcarrier modulation are presented....
Long Term Evolution (LTE) developed by Third Generation Partnership Project (3GPP), is the access part of the Evolved Packet System (EPS). LTE physical layer is based on Orthogonal Frequency Division Multiple Access (OFDMA) with Quadrature Amplitude Modulation (QAM). Although there has been lots of enhancements in the LTE physical layer, yet higher order modulation schemes were not introduced in the...
Recently, information and communication technology has been attracting attention in medical field. Among them, BAN(Body Area Network) becomes important because it is suitable for the watch of medical information. However, certification of BAN takes a lot of time in Japan because it must be approved with both of the Radio Act and Pharmaceutical and Medical Device Act(PMD Act). Therefore, we propose...
CCSDS File Delivery Protocol is an important protocol providing reliable delivery services for space communications. In this paper, a periodical service curve model for CCSDS file delivery protocol of deferred negative acknowledgement with Fractional Brownian Motion (FBM) as arrival model of spatial data service flow is established. Meanwhile, numerical analysis upon delay bounds, throughput and bit...
Turbo code has been one of the important subjects in coding theory since 1993. This code has low Bit Error Rate (BER) but decoding complexity and delay are big challenges. On the other hand, considering the complexity and delay of separate blocks for coding and encryption, if these processes are combined, the security and reliability of communication system are guaranteed. In this paper a secure decoding...
In Cognitive Radio Networks (CRNs), Cognitive radios (CRs) learn from their environment and adapt to the environment based on their learned beliefs accordingly. Malicious nodes may exploit the cognitive engine of CRs, and conduct belief manipulation attacks to degrade the network performance. In this paper, we address the problem of belief manipulation attacks and develop a distributed trust management...
The enormous increase in wireless enabled devices has posed a great challenge for effective resource sharing in Wi-Fi networks. This challenge has triggered the re-evaluation of wireless resource sharing protocols. Available frequency spectrum is probably the most valuable network resource. Therefore, effective utilization of this scarce resource is highly desired. The traditional channelization of...
In this paper, we analyze the bit error rate (BER) and the throughput of decode-and-forward (DF) relaying with imperfect channel estimation and in the presence of a jammer in the network. We consider a single DF relay scenario with orthogonal cooperative protocols and an active jammer during all the transmission phases attacking the relay and destination nodes in the network. In our analysis, we assume...
Recent, as interest in the vehicle communication is high, various techniques have been developed. However, the vehicle communication has a problem due to high-speed mobility of vehicle. Especially V2I (Vehicle-to-Infrastructure) communication has a biggest problem that is deterioration of continuity and reliability caused by frequent hand-off with base station due to high-speed mobility of vehicle...
This work focuses on a multi-core VLSI implementation of a multiple-input multiple-output (MIMO) detector utilizing a sphere-decoding algorithm. A complex-domain node traversal algorithm that achieves similar performance results as that of an exhaustive-search algorithm where every node is checked and sorted is also described. A 4×4, 64-QAM hard-output detector utilizing this VLSI design occupies...
Recently, interference problem between homogeneous network has been occurred in many places. There are several methods for solving this problem, however, methods of analyzing the performance is limited in specific layer such as measuring capacity, outage probability, bit error rate and so on. Because every transmission approaches are jointly related about PHY and MAC layer, we implement PHY and MAC...
This paper we evaluates the performance of multiuser multiple input and multiple outputs (MU-MIMO) detection schemes. MIMO transmissions schemes include transmit diversity and spatial multiplexing and MIMO detection schemes such as zero forcing and soft spheres decoding (SSD). The performance metrics considered are throughput and bit error rate (BER) and these are used to evaluate the performance...
In wireless sensor networks, multi-node cooperative relaying (MR) scheme represents a potential candidate to combat the effects of channel fading by exploiting diversity gain achieved via cooperation among the relays nodes. But, a great many of relaying channels are employed in MR system, which means that the number of required channels, the energy consumption and transmission delay all increase linearly...
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