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Orthogonal Frequency Division Multiplexing (OFDM) is a method of encoding digital data on multiple carrier frequencies. It has become a prevalent technique for wideband digital communication. Forward Error Correction (FEC) schemes for OFDM communication system is presented in this paper. Interleaver is a vital part in the communication system design. Matrix interleaver implementation which significantly...
Tactical communications is a communication system which is applied to a military operation with some strict requirements compared to a commercial communication system. One of the important requirement is its security. This communication has a high risk to be attacked by jamming which generated by the adversary. The other important requirement is network flexibility to handle its high mobility and...
In this paper, we have introduced an improved combined cryptography-error correction method, which is called "Crypto-Coding". Although in previous experiments, combined error correction and encryption functionality has been studied into one single step, the modification needed in the introduction of encryption block improves the performance of the system. The combined System's performances...
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...
The optical wireless communication attracts much attention as an option for the indoor mobile communication technology. It utilizes the optical transmitter as a carrier source and photodiodes in the transmitted wavelength range as a signal detector. An indoor optical wireless communication system using convolutional coding is demonstrated by computer simulation. The data stream is coded into a convolutional...
A switchable-rate quasi-cyclic low-density parity-check (QC-LDPC) coding scheme has been proposed for integration within the legacy and next-generation high-frequency internet protocol (HF-IP) systems. The novelty in this work is based upon using a class of switchable-rate short-block-length (<;1500 bits) QC-LDPC codes for the HF fading channel modelled by the ITU-R F.1487 for all latitudes and...
Due to the rapid evolution of mobile communication systems that uses Code Division Multiple Access (CDMA), the importance of multiuser detection increased significantly. This paper aims to illustrate the performances of synchronous Minimum Mean-Square Error (MMSE) multiuser detectors in presence of convolutional coding/decoding and turbo coding and decoding algorithms, in perfect and imperfect reception...
In this paper, we evaluate the security of a recently proposed joint error correction and encryption approach called chaotic convolutional coder, which integrates the chaotic encryption into the convolutional coding. We show that the probability of recovering the key vector controlling the chaotic switch is at least 0.289 under known-plaintext attack, if the number of available plaintext/ciphertext...
A low complexity distributed coding scheme is proposed for communications over Rayleigh fading channels. Convolutional Coding (CC) assisted Differential Phase-Shift Keying (DPSK) modulation is employed at the source node for conveying the source signals to two relay nodes as well as to the destination node during the first transmission period. Iterative detection exchanging extrinsic information between...
This paper presents a novel multi-functional MultipleInput Multiple-Output (MIMO) scheme that combines the benefits of the Vertical Bell Labs Layered Space-Time (V-BLAST) scheme, of SpaceTime Codes (STC) as well as of beamforming. To further enhance the attainable system performance and to maximise the coding advantage of the proposed transmission scheme, the system is also combined with multi-dimensional...
Minimum transmission power using transponders in low earth orbit satellite is a major requirement for the new geo-positioning system, known as Geolocal. It utilises a repeater in space and ground-based precise geodetic reference bases. We discuss and compare two digital codings on the QPSK (quadrature phase shift keying) modulation: concatenated Reed-Solomon/Convolutional Coding and concatenated BCH...
The bit error rate (BER) performance analysis of an OFDM wireless communication system is carried out considering the effect of fading and multipath dispersion. Further, forward error correction coding such as convolutional coding (CC) is also applied to improve the BER of OFDM-wireless communication system. Significant improvement in receiver performance is obtained by numerical computation.
The bit error rate (BER) performance analysis of an OFDM wireless communication system is carried out considering the effect of fading and multipath dispersion. Analysis is extended to include multiple-input and multiple output (MIMO) transceiver configuration to combat the effect of fading. Further, forward error correction coding such as convolutional coding (CC) is also applied to improve the BER...
In this paper we propose a mitigation technique for the protection of critical data in electronic devices from Single Error Upsets (SEU) that manifest themselves as bit-flips in memory. In order to cope with this problem, we take advantage of convolutional codes. We propose a methodology to generate a light decoder architecture considering all the possible combinations of generator polynomials of...
Convolutional coding is usually exploited to protect data transmitted over channels, where they are more susceptible to errors. However in recent years, an increasing interest has been drawn to the problem of radiation-induced temporary faults, also called soft errors, which corrupt memory content even during the normal functioning of a system. In this paper, a mitigation technique for the protection...
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