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This paper presents the validation of the unified propagation model, the Lisbon University Institute (LUI) model, which is valid for three wireless technologies: Wireless Fidelity, Universal Mobile Telecommunications System and Worldwide Interoperability for Microwave Access. With this purpose in mind, several experimental trials for those technologies were performed in different scenarios, where...
In this paper we consider the use of hierarchical Quadrature Amplitude Modulation (QAM) constellations for Multimedia Broadcast/Multicast Service (MBMS) within Wideband Code Division Multiple Access (WCDMA) based systems. These constellations are employed so as to increase the transmission efficiency, since they are able to provide unequal error protection to different information bit streams. With...
The ZF (zero forcing) algorithm is one of the best linear receivers for DS-CDMA (direct sequence-code division multiple access). However, for the case of MIMO/BLAST (multiple input, multiple output/Bell Laboratories layered space time) with high loading, the perceived complexity of the ZF receiver is taken as too big, and thus other types of receivers are employed, yielding worse results. In this...
This paper focuses on the use or an equalization-based receiver for WCDMA (wideband code-division multiple access) MIMO (multiple input, multiple output) BLAST (Bell Labs layered space time)-type systems. The receiver is based on the MMSE (minimum mean square error) algorithm and is tested using the UMTS (Universal Mobile Telecommunications System) HSDPA (high speed downlink packet access) standard...
In this paper we consider the use of M-QAM hierachical constellations (quadrature amplitude modulation) and MIMO (multiple input multiple output) for the transmission of multicast and broadcast services in the downlink connection of a WCDMA (wideband code division multiple access) system. The objective is to increase the efficiency of the transmission by splitting the information in classes with different...
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