System-Level Performance Evaluations of Spatio-Temporal Equalizers Using Two-Dimensional Channel Sounding Field Measurement Data
| Autor: | Matsumoto, Tad, Yamada, Takefumi, Tomisato, Shigeru |
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| Jazyk: | angličtina |
| Rok vydání: | 2002 |
| Zdroj: | Proceedings of the XXVIIth General Assembly of International Union of Radio Science (URSI GA 2002). |
| Popis: | Recently, joint spatio-temporal equalization (S/T-Equalization) techniques have been recognized as potential technological basis that can achieve significant enhancement in signal transmissionperformances over broadband mobile communication channels. S/T-Equalization is a unified concept combining adaptive array antennas and temporal equalizer concepts. Obviously, a purpose of S/T-Equalization is to endow receivers with theimmunity against co-channel interference (CCI) and inter-symbol interference (ISI), aiming at allowing all users to use the same frequency- and time-slots without spreading their signals in the frequency domain. Various signal processing algorithms for S/T-equalizers have been proposed. Refs. [1] and [2] survey the historical background of the technology, and summarize current trends in S/T-equalizer algorithm development. Despite the volume of efforts made on algorithm development, few papers have examined in-field performance [3]-[5]. We have presented initial investigation results on the effectiveness of S/T-Equalization techniques under real mobile radio propagation environments through link-level simulations using two-dimensional channel sounding field measurement data [6], [7]. The link-level simulation focuses on analyzing/evaluating the impact of S/T-equalizer configurations, parameters, and algorithms on performance in the field. A reasonable extension of the link-level simulations is the simulations that aim to obtain system-level performance figures such as geographical distribution of signal-to-interference plus noise power ratio (SINR) in the areas of interest as well as outage probability.The main focus of this paper is to evaluate outage probabilities of a cellular communication system featuring an S/T-equalizer, taking into account the presence of multiple interferers that use the same time- and frequency-slots. Two-dimensional channel sounding field measurement data gathered in a typical urbane area of Tokyo is used in thesimulations. This paper is organized as follows: Section 2 describes in detail the S/T-equalizer configuration investigated in this paper. The algorithm used to determine the tap weights in the S/T-equalizer is also presented in Section 2. In Section 3, the simulation methodology for evaluating system-level performance figures of theS/T-equalizer using two-dimensional channel sounding field measurement data is introduced. In section 4, uplink outage probabilities for various S/T-equalizer configurations, obtained as results of the simulations, are presented. Finally, a major conclusion of this paper is drawn in Section 5. URSI General Assembly, Maastricht, Aug. 2002 |
| Databáze: | OpenAIRE |
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