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Walsh and Gold codes are binary valued and are widely used in wireless CDMA applications due to their ease of generation as well as their fixed power property. There are not many code families available in the binary sample space with good performance. Intra- and inter-code correlations and in turn performance might be improved if we relax the sample values of spreading codes. In this paper, we attempt...
Wireless sensor networks consist of a large number sensors spread across a given geographical area. Each sensor has its own communication capability as well as certain level of intelligence for signal processing and networking. As the sensor nodes are densely populated, communication range requirement for these nodes is smaller. After signal detection, a number of sensor nodes communicate over the...
In this letter, the eigen-analysis-based optimal design method of orthogonal block transform, the so-called Karhunen-Loeve transform, is used to generate a new family of spread spectrum codes. These spread spectrum and varying power orthogonal codes might find their application in direct sequence code division multiple access (CDMA) communications. The basis functions of the proposed transform are...
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