Information theoret ic aspects of C o d e Division Mult iple Access ( C D M A ) r a n d o m directsequence spread-spectrum (DSSS) are investigated. T h e CDMA-DSSS channel wi th randomly a n d independent ly chosen spreading sequences accurately models the s i tuat ion where pseudo-noise sequences span many symbol per iods. We analyze t h e spec t ra l efficiency ( total capaci ty p e r chip) a...

In recent years there has been increasing attention towards digital rights. Therefore, this paper proposes a matrix barcode to verify image copyrights. The copyright text, Quick Response code (QR code), and watermarking techniques are used to achieve a hidden identification scheme implementing direct sequence spread spectrum (DSSS) and modulation of the modified code division multiple access (M...

Complementary WLAN and WPAN technologies as well as other wireless technologies will play a fundamental role in the medical environments to support ubiquitous healthcare delivery. This paper investigates clear channel assessment (CCA) and its impact on the coexistence of WLAN (IEEE 802.11 high rate direct sequence spread spectrum (HR/DSSS) PHY) and WPAN (IEEE 802.15.4b) in the 2.4 GHz industria...

Abstract Rapid developments in Artificial Intelligence are leading to an increasing human reliance on machine decision making. Even collaborative efforts with Decision Support Systems (DSSs), where a expert is expected make the final decisions, it can be hard keep actively involved throughout process. DSSs suggest their own solutions and thus invite passive To humans ‘on’ decision-making loop c...

D ecision support systems (DSSs) are software products that help users apply analytical and scientific methods to decision making. They work by using models and algorithms from disciplines such as decision analysis, mathematical programming and optimization, stochastic modeling, simulation, and logic modeling. DSS products can execute, interpret, visualize, and interactively analyze these model...

Increased demand of farm products and depletion of natural resources compel the agriculture community to increase the use of Information and Communication Technology (ICT) in various farming processes. Agricultural Decision Support Systems (DSS) proved useful in this regard. The majority of available Agricultural DSSs a re either crop or task specific. Less emphasis has been placed on the devel...

Multiuser underwater acoustic communication is one of the enabling technologies for the autonomous ocean-sampling network (AOSN). Multiuser communication allows vehicles, moorings, and bottom instruments to interact without human intervention to perform adaptive sampling tasks. In addition, multiuser communication may be used to send data from many autonomous users to one buoy with RF communica...

This paper presents a comparative study of Frequency Hopping Spread Spectrum and Direct Sequence Spread Spectrum techniques. The Transmitter and Receiver have been implemented using MATLAB. Maximum-length sequences, Gold Sequences and Walsh Codes have been used as the pseudorandom codes for transmission. Finally received signal have been evaluated on the basis of Bit Error Rate for all the used...