Position-based diversity and multiplexing analysis for high speed railway communications

The booming development of high speed railway (HSR) in recent years triggers a rapidly growing demand of high-quality wireless communication, which at the meantime motivates great research interest in providing a reliable and high data rate wireless communication in high speed scenarios. To continuously explore the nature and character of HSR scenario, this paper mainly aims to investigate the reliability and instantaneous capacity of the multiple-input-multiple-output (MIMO) system through taking full advantage of diversity gain and positioned-based channel characters. We take both the large and small scale fading into modeling this scenario. Through Monte-Carlo simulation, we give out the bit error rate and the handover success probability for one carriage when applying a low decoding complexity full-rate full-diversity orthogonal space time block coding scheme. Besides, we give out the channel capacity and the total mobile service of one base station (BS) with full multiplexing gain in HSR scenario. After compared with practical measured values, we can draw the conclusion that a single antenna system can hardly meet the requirements of growth-expected wireless communication demands without buffering or subtle transmission scheme designing, which will obviously aggravate the overheads and increase the system complexity. However, a 2×2 antenna system with full multiplexing gain is more than enough to solve this tradeoff dilemma.