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Throughput is an important parameter that it is used to measure the performance of wireless local network (WLAN). In this research, we proposes a new discrete time Markov chain model to calculate the boundary of saturated and unsaturated throughput efficiencies in WLAN channel. Both throughput parameters are compared in fixed back off stages and fixed contention window sizes (FBFC) technique by applying...
The design of wireless embedded systems needs their efficient and realistic simulation to verify that requirements are met. The reproduction of communication behavior is crucial to assess the performance of hardware and software components, e.g., dependability and energy consumption. This work presents and discusses different levels of abstraction for the simulation of the communication behavior....
We designed and experimentally demonstrated a scalable datacenter architecture with intra-cluster all-to-all topology and flat inter-cluster interconnection based on wavelength routing in AWGRs. Experiments show 97% intra-cluster throughput for uniform random traffic, and error-free inter-cluster communication at 10Gb/s.
Duobinary partial response (PR) filtered single-carrier frequency-domain multi-access (SC-FDMA) uplink has a potential to achieve higher spectral efficiency (SE) by allowing spectrum overlapping between adjacent users. However, strong multiuser interference (MUI) degrades the bit-error rate (BER) and throughput performances. In this paper, we present two types of frequency-domain MUI cancellation...
The characteristics of the underwater acoustic communication, such as large propagation delay, high bit error rate and half-duplex, bring great challenges to traditional automatic repeat request (ARQ) schemes. In this paper, we propose two hybrid ARQ (HARQ) schemes, Type-I HARQ and Type-II HARQ, for the underwater acoustic system according to the specific characteristics of the underwater acoustic...
Cooperative communication is becoming a viable means of performance enhancement for wireless networks. It provides diversity by emulating multi-input and multi-output (MIMO) system for devices that are spatially too small to harbor multiple antennas. Conventional cooperative protocols such as amplify-and-forward (AF) and decode-and-forward (DF) attain diversity gain at a cost of reduced spectral efficiency...
In the paper, a new implementation of a 3GPP LTE standards compliant turbo decoder based on GPGPU is proposed. It uses the newest GPU-Tesla K20c, which is based on the Kepler GK110 architecture. The new architecture has more powerful parallel computing capability and we use it to fully exploit the parallelism in the turbo decoding algorithm in novel ways. Meanwhile, we use various memory hierarchies...
We propose a dynamic hybrid antenna/relay selection scheme for multiple-access relay systems. The proposed scheme aims to boost the system throughput while keeping a good error performance. By using the channel state information, the destination node performs a dynamic selection between the signals provided by the multi-antenna relay, located in the inter-cell region, and the relay nodes geographically...
Cooperative wireless communication network provides diversity by emulating multi-input and multi-output (MIMO) system for devices that are spatially too small to harbor multiple antennas. Since mobility and easy handling require terminal miniaturization, cooperative communication is required to fill the gap for MIMO. Conventional cooperative protocols such as amplify-and-forward (AF) and decode-and-forward...
There are advantages to retrieve information from the Wireless Sensor Network (WSN) for UAVs (Unmanned Aerial Vehicles). However, the UAV-WSN system has some differences with conventional WSN system. So it is important to design an appropriate scheme to control the transmission in a UAV-WSN system. In this paper we proposed a protocol called A-OAloha (Adaptive-Opportunistic Aloha) for UAV-UAV-WSN...
In this paper, we carry out a performance comparison and analysis between two two-class multirate OCDMA packet networks in terms of bit error rate (BER) and throughput. We employ multiple-pulses-per-row (MPR) codes as signature sequence of an incoherent network to achieve multirate and multiservice transmissions. We derive BER and packet success probability expressions, considering multiple-access...
This paper proposes an adaptive data aggregation for wireless sensor networks in the TD-SCDMA system. Our design explores a data transmission approach: the atomic MAC layer unit is sent through the TD-SCDMA radio channel by dynamically aggregating one or more sensor packets. A trade-off exists between the desire to reduce header and physical layer overhead by making frames larger, and the need to...
This paper presents a high-throughput layered min-sum quasi-cyclic LDPC (QC-LDPC) decoder for non-volatile memory systems (NVMs). A cost-effective column-based early termination (CB-ET) scheme is proposed to early terminate decoding process within iteration. The throughput improvement is 37.7% compared to the state-of-the-art early termination scheme when raw bit error rate of flash memory is 3×10...
Cooperative communication is establishing itself as a viable means of performance enhancement for wireless networks. It provides diversity by emulating multi-input and multi-output (MIMO) system for devices that are spatially too small to harbor multiple antennas. Since mobility and easy handling require terminal miniaturization, cooperative communication is required to fill the gap for MIMO. Conventional...
Physical-layer network coding (PNC) is an effective strategy for increasing the throughput of wireless networks. In the current literatures, PNC without rate and power adaptation is mainly focused. Realizing that the transmission efficiency can be improved through rate and power adaptation in wireless networks, this paper focuses on developing a rate and power adaptation scheme for PNC. Through formulating...
A bit error rate (BER) estimation-based adaptive space-time-frequency coded (STFC) multiband orthogonal frequency division multiplexing ultra-wideband (MB-OFDM UWB) wireless body area network (WBAN) system is proposed in this paper. It is designed to improve the average BER performance for high data rate applications while maintaining a reasonably high throughput in body-to-external links of a WBAN...
In this paper, physical-layer network coding (PNC) aided bi-directional cooperative relay strategies are proposed for four-node transmitted reference pulse cluster (TRPC) ultrawideband (UWB) systems, which can improve the network throughput and accomplish information exchange within two time slots instead of four. First, we develop a new detector and a link quality indicator (LQI) at the relay side...
In this paper, we propose a novel estimate-and-forward (EF) transmission protocol, and combine it with the essence of compressive sensing (CS) for a network consisting of two correlated sources, one relay and one destination. Compared with the conventional estimate-and-forward (EF) protocol, in our protocol, correlation is exploited in calculating the soft symbols at the relay. Then we transform the...
We study the resource scheduling for Wireless Sensor Network (WSN) based on Single Carrier Frequency Division Multiple Access (SC-FDMA) technique. This work distinguishes itself from the existing work in: 1) the scheduling for a relay network, 2) the scheduling for multimedia-enabled sensor nodes taking into account diverse QoS characteristics such as delay sensitive (DS), rate sensitive (RS), best...
In multihop diversity aided multihop links, the number of bits transmitted in each Time Slot (TS) is affected by both the Channel Quality (CQ) and the Buffer Fullness (BF), when adaptive modulation is employed. We assume that every node has buffers for temporarily storing its received packets for further transmission at instances of good CQ. For the sake of improving the throughput, a Maximum Throughput...
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