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Nowadays Free Space Optical (FSO) systems are a promising approach for a variety of applications such as interconnection of network nodes and as rapidly deployable communication systems in disaster recovery situations. In particular deploying FSO technology for mobile links between Unmanned Aerial Vehicles (UAVs) and fixed Ground Stations (GS) introduces several interesting challenges. In this paper,...
A hybrid 2 slots binary phase shift keying-on off keying (hybrid 2BPSK-OOK) scheme is proposed as a new modulation technique to improve the performance of both conventional binary phase shift keying (BPSK) and on-off (OOK) modulation techniques in optical fiber communications systems. In conventional BPSK scheme, a consecutive stream of low power BPSK symbols are transmitted, while in the proposed...
In this paper, we design a simulator using Matlab/Simulink that evaluates the anti-jamming capability of a tactical data link (TDL) system, called Link-16. We analyze the BER performance of the Link-16 simulator over partial-band noise jamming. Especially, we consider a TDL system with the cognitive anti-jamming capability that senses the jamming signal and opportunistically avoids the jamming spectrum...
Intensity noise (IN) or phase induced intensity noise (PIIN) is the key limiting factor of the performance in spectral amplitude coding optical code division multiple access (SAC OCDMA) systems. The PIIN can be mitigated in SAC OCDMA by splitting the signals and detecting each signal by a different photodiode if the independence between the split signals can be achieved. In this paper, we derive the...
Recently, compressive sensing (CS) algorithms have been adopted to improve the accuracy of channel estimation for wide-band wireless communication systems. Since the wireless channel is usually time and frequency doubly selective fading, the performance of CS based channel estimation is limited by the estimation accuracy of the channel's sparsity level. In this paper, an adaptive subspace pursuit...
As a signal detection method for multiple-input multiple-output (MIMO) communications, this paper proposes multi-stream constrained search (MSCS) that achieves very good trade-off between computational complexity and bit error rate (BER) performance. The proposed method sets a minimum mean-squared error (MMSE) detection result to the starting point. From this point, MSCS searches for signal candidates...
In this paper, an iterative receiver with Turbo equalization and soft demapping is proposed for high data rate communication in multipath channels. Minimum mean square error (MMSE) equalization is adopted to avoid noise enhancement. With the assumption that the distribution of estimated symbols is Gaussian distribution, log likelihood ratios (LLR) of encoded bits are obtained with soft demapping....
The market trends towards the use of smaller dish antennas for TV satellite receivers, as well as the growing density of broadcasting satellites in orbit require the application of robust adjacent satellite interference (ASI) cancellation algorithms at the receivers. The wider beamwidth of a small size dish and the growing number of satellites in orbit impose an overloaded scenario, i.e., a scenario...
Hybrid memory systems that incorporate Storage Class Memory (SCM) as non-volatile cache or DRAM data backup are expected to bolster system efficiency and cost because SCM promises higher density than DRAM cache and higher speed than the storage I/F. This paper demonstrates a Cu-based resistive random access memory (ReRAM) cell that meets the SCM performance specifications for a 16Gb ReRAM with 200MB/s...
In this paper, we describe an experimental evaluation platform, which enables us to obtain the performance of baseband modulation techniques for usage in Visible Light Communication (VLC) applications. For the demonstration of the evaluation platform, we have chosen for Manchester encoding. This choice is exemplary, the described system is able to deal with a large set of analog and digital modulation...
In this paper, we consider a molecular diffusion based communications link that conveys information on the macro-scale (several metres). The motivation is to apply molecular-based communications to challenging electromagnetic environments. We first derive a novel capture probability expression of a finite sized receiver. The paper then introduces the concept of time-aggregated molecular noise at the...
Atmospheric turbulence has made a significant contribution in free-space optical (FSO) communications' areas of research. Assuming slowly varying channel, a feedback can be implemented to overcome the problem of fading. In comparison with all former published works, in this paper, we apply an algorithm to reduce average power consumption by regulating transmitter Erbium Doped Fiber Amplifier (EDFA)...
The resistive switching memory (ReRAM) landscape encompasses several cell technology options. Filamentary systems that employ oxygen ion motion (O-ReRAM) or metal ion motion (M-ReRAM) and systems that employ uniform oxygen ion motion are being widely studied as potential candidates for next generation of non-volatile memory systems (NVM). While comparisons between different systems have been made...
In this paper a new robust, spread-spectrum image watermarking approach is proposed. A two level wavelet transform is applied to the host image. Then three high frequency sub-bands in level 2 are selected and the watermark is embedded by an spread-spectrum technique. Selected sub-bands are divided into square blocks. Each block carries Nb bits of watermark information. Watermark data is added as uncorrelated...
In this paper, we propose two novel receiver designs for asymmetrically clipped optical orthogonal frequency division multiplexing (ACO- OFDM). The first one, termed 'Proposed Receiver I', exploits the structure of the clipping noise which improves the power efficiency over the state-of- the-art ACO-OFDM receiver. The second one, termed 'Proposed Receiver II', exploits the benefit of bit error correction...
We propose a low complexity graph-based linear minimum mean square error (LMMSE) equalizer which considers both the intersymbol interference (ISI) and the effect of non-white noise inherent in Faster-than-Nyquist (FTN) signaling. In order to incorporate the statistics of noise signal into the factor graph over which the LMMSE algorithm is implemented, we suggest a method that models it as an autoregressive...
Experimental measurements have shown that the noise in many communication channels is non-Gaussian. Bit interleaved coded modulation (BICM) is very popular for spectrally efficient transmission. Recent results have shown that the performance of BICM using convolutional codes in non-fading channels can be significantly improved if the coded bits are not interleaved at all. This particular BICM design...
As a novel vital sign monitor, we have developed wireless ECG monitoring system with human body communication (HBC) technique. However, it was hard to ensure communication reliability because transmission channel is noisy and unstable. In order to solve the problem, we utilize spread spectrum (SS), which is known as robust communication technique even through poor transmission channel. In previous...
Multicarrier communication is a well-known and widely used method in the current wireless or wired data transmission. Orthogonal Frequency Division Multiplexing (OFDM) is the leading technology in this area and is implemented in various forms in almost every current broadband communication systems. It has a number of advantages, but also few significant shortcomings. Especially the high out-of-band...
OFDM based acoustic communication system for underwater application is proposed. In order to mitigate a shrimp (impulsive) noise created by ocean living creature, time and frequency domain noise canceller is introduced. 2 dimensional DFT based channel estimation is also adopted to enhance the mobility of the communication system. Ocean measurement was performed in the experiment, and 53.0 m distance...
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