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This paper proposes a partial packet recovery scheme, called Packetized Rateless Algebraic Consistency (PRAC). PRAC exploits intra and inter-packet consistency to identify and recover erroneous packet segments, without recourse to cross-layer or detailed feedback information. In the absence of cross-layer coordination or detailed feedback, the prevailing methods proposed in the literature have discarded...
Most recently, the low density parity check codes are chosen as the channel encoding method to encode the Wyner-Ziv frames in distributed video coding. These codes involve much complicated encoding and decoding algorithms, and might increase the processing time of the system. In this paper, we use the codes with simpler encoding and decoding algorithms, the Reed Solomon codes, and compare the performance...
The task of detecting and mitigating Cognitive Radios (CRs) operating as constant jammers in a Cognitive Radio network (CRN) can be very daunting. The CR constant jammers prey on the adaptable functionalities of CRN so as to cause serious denial of service to the users of the network. In addition, these jammers are capable of introducing value faults in pathological cases as a result of being able...
To facilitate the distribution of video contents, MPEG-DASH (Dynamic Streaming over HTTP) standard is developed to provide standardized manifest format, content format and streaming protocol for adaptive streaming, thereby increasing interoperability of Internet TV services. Although DASH contents are delivered by HTTP without supporting data multicast, some studies shows the possibility of delivering...
A crucial point on the delivery of multicast content over mobile multicast networks is the utilization of Forward Error Correction (FEC) codes on the application layer (AL-FEC) so as to introduce robustness against arbitrary erasures on different recipients without the need of inefficient common error control methods based on data retransmission. FEC is a feedback free error recovery method where...
Co-existing in the unlicensed ISM band, ZigBee transmissions can be significantly interfered by WiFi. Although several approaches recently are proposed to enable ZigBee transmission under WiFi interference, the ZigBee throughput still decreases to zero when WiFi throughput (generated by D-ITG) is over 8Mbps. In this paper, we propose a real-time (< 5ms) adaptive transmission (RAT) scheme to efficiently...
The subject of this paper includes the effect of MAC performance analysis for IEEE 802.15.4 protocol with BCH coding. To analyse the performance, data transmissions are made for different communication environments with different scenarious using BCH coding. Performance results are observed as changing values on MAC parameters. These parameters are composed of average transmission time, transmitted...
An OFDM based WiMAX physical layer combining with Continuously Variable Slope Delta (CVSD) speech coding strategy has been implemented utilizing GNU Radio and USRP N210. CVSD vocoder is a non linear sampled data feedback framework which recognizes a band limited analog signal and converts it into binary form for transmission through a digital channel. The binary signal is decoded into a nearby estimate...
As cyber-physical systems become pervasive, their power consumption and system design practices are major concerns. This paper explores problems of deploying Forward Error Correction (FEC) in wireless commercial standards such as IEEE 802.11b and 802.15.4. First, we describe battery life estimation that includes practical factors such as system issues and the negative impact by retransmissions vs...
Camera communications is the use of an image sensor to receive LED modulated data. The undersampling properties of UFSOOK allows the encoding of bits at frequency shift ON-OFF keying frequencies that avoid flicker while at the same time being successfully decoded by a low frame rate camera. PWM dimming is supported via data modulation of the PWM frequency, but requires that FEC be added in the form...
Logging-while-drilling (LWD) and measurement-while-drilling (MWD) applications have prompted the development of acoustic telemetry for retrieving downhole data. In this paper, a multilevel frequency shift keying (ML-FSK) modulation transceiver with pseudo-coherent differential energy detection is proposed and optimized for such acoustic telemetry applications. The motivation of employing the proposed...
The wavelet-based video coders are excellent in providing the fine granular scalability (FGS), i.e. progressive bitstream, which can be used to multicast the video transmission to different users requiring different bit-rate, resolution and frame rate, from single coded bitstream. However, transmission of these bitstreams over erroneous channel is a challenging task. In this paper, application layer...
A novel and blind detection scheme for the asymmetric Paired Carrier Multiple Access (PCMA) satellite communication system is proposed in the paper. Recently, the asymmetric application mode of PCMA, which is efficient and pragmatic in the VSAT network, has been studied with great interest. In our research, the symbol interference cancellation and Forward Error Correction (FEC) coding are introduced...
Application Layer Forward Error Correction (ALFEC) schemes are the most suitable mechanism for error control in mobile multicast services. AL-FEC introduces redundant information in advance with the source data to provide reliability control in the multicast transmission. Due to this fact the introduced redundancy must be carefully selected with respect to the current network conditions to avoid channel...
We present machine learning algorithms to tune an underwater communication link. The link tuner is characterized by 3 features: a) It is data driven, rather than physics driven. Hence, it only needs bit error rate information as input and is independent of the modem implementation, b) The tuner balances exploration of the search space against exploitation of existing knowledge, and c) It optimizes...
The current coding standard employs differential coding to reduce the coding rate. Decoding error may propagate in the following frames after a loss-unrecoverable frame. Since most of the current electronic devices are implemented with multiple interfaces, such as the 3G and WiFi, one way to solve the error propagation problem is to use cooperative strategies, which leverage on the ‘uncorrelatedness’...
In this paper, we evaluate the performance of random linear network coding (RLNC) in low data rate indoor sensor applications operating in the ISM frequency band. We also investigate the results of its synergy with forward error correction (FEC) codes at the PHY-layer in a joint channel-network coding (JCNC) scheme. RLNC is an emerging coding technique which can be used as a packet-level erasure code,...
In this paper, we study the efficacy of error control schemes for energy-efficient reliable delivery of large files (hundreds of GBs) over core optical networks. Specifically, we examine two schemes: automatic repeat request (ARQ), and hybrid ARQ (i.e. ARQ combined with forward error correction (FEC) capability). We focus on Reed-Solomon (RS) FEC codes (in hybrid ARQ) and propose a new model, incorporating...
This paper presents a combination of Forward Error Correction (FEC) and error detection for UHF RFID transmission based on the EPCglobal protocol. A simple detection method which uses the spreading sequences in the RFID protocol is considered. The number of unreliable bits n taken into account in the detection scheme influences the packet error rate (PER) and the false negative rate (FNratio). The...
Convolutional codes are applied in applications that require good performance with low implementation cost. It is a finite state machine, processing information bits in a series manner. Viterbi algorithm [1] can be applied to a host of problems encountered in digital communication systems. The Viterbi algorithm cannot detect any error but can sometimes correct it, while calculating one survivor path...
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