This article presents a study of seismic data compression techniques and a compression algorithm based on subband coding. The algorithm includes three stages: a decorrelation stage, a quantization stage that introduces a controlled amount of distortion to allow for high compression ratios, and a Iossless entropy coding stage based on a simple but efficient arithmetic coding method. Subband codi...

This paper presents a study of seismic data compression techniques and a compression algorithm based on subband coding. The algorithm includes three stages: a decorrelation stage, a quantization stage that introduces a controlled amount of distortion to allow for high compression ratios, and a lossless entropy coding stage based on a simple but efficient arithmetic coding method. Subband coding...

Introduction: Brain visual evoked potential (VEP) signals are commonly known to be accompanied by high levels of background noise typically from the spontaneous background brain activity of electroencephalography (EEG) signals. Material and Methods: A model based on dyadic filter bank, discrete wavelet transform (DWT), and singular value decomposition (SVD) was developed to analyze the raw data...

With the rapid growth of network multimedia systems and other numerical technologies, images, audio, text and video can be more easily produced, processed as well as stored by digital devices in recent years. To conceal data in transmitting message for copyright protection the secret is very important. Various Digital Watermarking Techniques are developed to protect the secret data. This paper ...

The interferometric synthetic aperture radiometer (InSARad) is a microwave imaging instrument with the large field of view and high spatial resolution by synthetic aperture technique. However, its performance is limited to the decorrelation effects. A space variant degradation image restoration method based on coordinate transform to alleviate the decorrelation effects is presented, and its val...

Introduction: In a DS-CDMA downlink scenario, transmission over a dispersive channel destroys the mutual orthogonality of the codes which are used to multiplex the various users in the system. As a result, the received and code-demultiplexed user signals are subject not only to inter-symbol interference (ISI) owing to channel dispersion but also to multiple access interference (MAI). Consequent...

The multipath-rich wireless atmosphere allied with typical wireless usage scenarios is characterized by a vanishing channel retort that is time-varying, location-sensitive, and only shared by a given transmitter–receiver pair. The complexity allied with a highly scattering atmosphere implies that the short-term vanishing process is intrinsically hard to envisage and best modeled stochastically,...

This paper incorporates a comprehensive BER simulation study undertaken on the effectiveness of a Quasi Orthogonal Space time block code (QO-STBC) encoded DWT Based MIMO CDMA wireless communication system. The Code Division Multiple Access (CDMA) is a promising technique for high bit rate transmission in wireless communications systems. The QO-STBC encoded DWT Based MIMO CDMA system under prese...