In cellular networks that exploit the millimeter wave bands, access points are expected to be densely deployed and to share limited radio resources. In such systems, the geometric distribution of the downlink signal-to-interference-plus-noise ratio (SINR) is affected by several random variables such as path loss, blockage, small scale channel fading, interferer density, antenna array orientation, and thermal noise. Therefore, using fixed modulation in such varying environments is inefficient as it degrades the spectral efficiency and/or increases the outage probability. To tackle this issue, the transmitter needs to adapt the modulation order to the link condition. In this paper, we introduce an adaptive modulation technique, which depends on the geometric distribution of the SINR, for millimeter wave cellular systems in order to enhance their performances in terms of average spectral efficiency. In this case, the transmitter adjusts the modulation type of the transmitted signal based on the receiver geometry and the link condition. First, we present an analytical model using geometry tools to compute the statistical distributions of the downlink SINR. Then, the performance of the adaptive modulation scheme is studied and evaluated in terms of the average spectral efficiency. Numerical results show that, while keeping the outage probability as minimum as possible, this geometry-based adaptive modulation can efficiently enhance the millimeter wave system average spectral efficiency.
Performance Analysis of Adaptive Modulation for Millimeter Wave Cellular Systems
01.05.2020
213648 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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