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Wireless sensor networks are very much concerned on conserving power and error control coding is a considerable burden on this power conservation. Thus, this paper proposes a diversity based routing algorithm to achieve the reliability in the absence of error control coding. Two diversity combining techniques are also proposed. The simulation results demonstrate that the proposed routing algorithm...
Transmitted reference pulse cluster (TRPC) structure was proposed as an improved transmitted reference (TR) signaling for low date-rate ultra-wideband (UWB) communications. In the uncoded case, TRPC outperforms the conventional TR and non-coherent pulse position modulation (NC-PPM) signaling schemes. Moreover, it overcomes the implementation problem of the long delay line inherent in the conventional...
Considerable efforts to improve the performance of multicast communication have been rarely successful in wireless network due to wireless channel nature. In this paper, we propose a reliable multicast engine considering both QoS and throughput enhancement. It includes 1) Application-layer Hybrid FEC/ARQ, 2) Adaptive FEC code rate control, 3) Feedback implosion avoidance, 4) Low-latency fast retransmission,...
□ Following power — aware practices throughout a design cycle can lead to very low power DSP and SDFEC designs for the optical transceivers □ The slides captured a sub-set of techniques being used in designs today □ Newer more creative solutions continue to be invented
We consider the introduction of three different methods to signalize which data packets are used to generate each repair packet in systematic coding schemes employing flexible connection setups: a first one based on a mask, a second one on explicitly pointing out the links between the two packet streams, and a third one on sharing the signaling load between both flows. These methods have been evaluated...
Today, when the content provider transmits a video, he usually uses forward error correcting to protect the packets which caused a lot of redundancy. If we know parts of the media stream are more important than others, we can uses bandwidth more efficiently. In this paper, we analyze the structure of the video stream, the frame types and the dependence among frames and propose an optimized scheme...
This paper proposes systematic lossy description coding for robust video transmission over error-prone channels. The problem of error propagation is addressed here by first structuring the data to be encoded into two descriptions. In a first approach, the two descriptions are constructed by splitting odd from even frames. Each description is separated into two sub-sequences, one being conventionally-encoded,...
Video communication at very low bit-rates has made significant progress recently through the new ITU-T standard H.263. In this paper, we are reviewing the performance advances over the 1990 ITU-T standard H.261, and present a novel extension that allows robust transmission of moving video over highly unreliable channels, such as the mobile channel.
Transmission efficiency is an interesting topic for data link layer developers. The overhead of protocols and coding should be reduced to a minimum. This maximizes a link throughput. This is especially important for high-speed networks, where a small degradation of efficiency will degrade the throughput by several Gbps. We describe a redundancy balancing algorithm for an adaptive hybrid automatic...
In this paper, we present an evaluation of two forward error correction (FEC) codes, Hamming codes and Reed-Solomon codes, used in the tag communications within the ISO 18000-63 (Gen2) passive Radio Frequency Identification (RFID) tag identification protocol. Gen2 tags utilize backscatter communication, and their communication signal is often −60dBm or lower when it reaches the reader. Signals at...
This paper presents a joint source and channel rate allocation algorithm for video transmission over erasure channels. The approach relies on unequal error protection (UEP) of the video stream, in order to minimize the received signal distortion. It takes into account both the frames and the channel characteristics. The loss behavior is approximated by a two states Markov model. The algorithm is incorporated...
Due to elevated data rate transmission, fading immunity and bandwidth efficient capability, OFDM comes out as a key technology in contemporary wireless communication systems. Additionally, to access error free transmission, diverse channel codes for instance Convolution Codes (CC), Reed Solomon (RS) and BCH codes are being used in the previous work. In this work, an OFDM based M-PSK wireless system...
This paper provides a performance comparison of mixed modulation codewords and shortened codewords defined in DOCSIS 3.1 specifications. In mixed modulation codewords, the same modulation constellation is not used for all sub-carriers of the OFDM symbol. The performance comparison is needed to decide efficient transmission parameters at the view of signal-to-noise ratio and spectral efficiency. In...
Interactive video, due to the need to maintain synchronization, has strict latency requirements. Video streaming to residential users is also constrained by the error bursts that are a feature of Digital Subscriber Link (DSL) access. This paper examines the video response to unlicensed Low-Density Generator Matrix (LDGM) channel codes that combine reduced computational latency and small block sizes...
This paper propose a networked distributed storage system based on an emerging MPEG Media Transport (MMT) standard. The proposed system has high error recovery capability because of its unequal error protection of image/video components by using MMT Layer-Aware LDGM codes. Higher priority image/video components are well protected by this scheme. The decoded image/video quality is better than that...
Some proposed high speed wireline communications make use of an ADC front end to allow a feedforward equalizer (FFE) to compensate for the frequency dependent loss of the channel. High precision ADCs are expensive in terms of power. The FFE block performs multiplication and addition operations at high speed and further increases the power consumption. This paper proposes a simple forward error correction...
Wireless technology for audio transmitting has many aspects of use. This paper describes one solution of a wireless audio system based on G.722 codec. One of a major problem in wireless technology is an electromagnetic interferences which can corrupt transmitted data. To protect against that problem, FEC (Forward Error Correction) technique was developed. One implementation of FEC is described in...
We review single parity check based bit-interleaved coded modulation with iterative decoding in fiber optic systems. Coded modulation achieves high SNR sensitivity and large Euclidean distance and can remove phase ambiguity which allows approaching nonlinear Shannon limit.
In this paper, we discuss and present some recent advances in the field of error correcting codes and discuss their applicability for lightwave transmission systems. We compare polar codes and spatially coupled codes and present recent modifications of the latter.
Storing multiple bits in a flash memory cell is a primary technique to linearly increase flash memory capacity, but memory endurance is tremendously sacrificed. This paper presents a multilevel fault tolerance technique for MLC flash memories. The main idea is to explore multi-level forward error correction (FEC) for multiple bits in a flash cell. The associated practical implementation issues are...
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