Abstract-Spatial diversity is an attractive technology to cope with the fading channel encountered in mobile communications. This paper presents novel closed analytical expressions of the bit-error rate (BER) achievable in a coherent binary phase-shiftkeying (CBPSK) direct-sequence code-division multiple-access (DS/CDMA) system for any power delay profile and for either postdetection selection or maximal ratio combining (MRC). In particular, expressions for the cutoff rate R o and for its related parameter D are also formulated in order to assess the system performance under the consideration of some channel coding schemes. Finally, an exemplary study is carried out in order to illustrate the behavior of a realistic space-diversity code-division multiple-access (CDMA) system according to the analytical expressions that have been derived.
Dentro del Plan Nacional de Investigación en Conservación coordinado por el Instituto de Patrimonio Cultural de España (IPCE) y en colaboración con el Instituto Valencia de Don Juan de Madrid, se ha desarrollado un proyecto interdisciplinar aplicado a un conjunto de tejidos medievales, basado en técnicas de análisis que permiten un conocimiento más preciso de la tecnología textil y caracterización de los materiales constituyentes.
Los análisis efectuados en este corpus nos han permitido establecer diferentes centros de producción, elaborar una relación detallada de las técnicas textiles empleadas en los diferentes periodos, así como identificar variaciones en la composición de los hilos metálicos y colorantes, en función de la zona geográfica en la que han sido producidos.
The possibility to change data rate in 10 milliseconds is one of the innovative features of the Universal Mobile Telecommunications System (UMTS). This change results in a different mobile channel with different burst error characteristics that can be modelled and its effects can be emulated by Hidden Markov Models (HMM) which are computationally more efficient than waveform level models. Thus the data rate change in the wideband CDMA (WCDMA) channel supposes to change the HMM. This change from one HMM to another can be performed considering the number of errors in the last frame or not. In this paper the impact of error memory when the channel emulated by HMM change, is presented'.
Currently, we are involved in a standardisation process to specify the next mobile system generation. A Wideband Code Division Multiple Access (WCDMA) system is considered in most of the region versions. It would be very useful to count on a radio channel emulator which allows to evaluate higher layers protocols within this context. This paper presents a radio channel emulator developed for a Code Division Multiple Access (CDMA) based system. Its versatility and low complexity have been exposed, and the validation process to check the model accuracy has also been shown for this system as an example.
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