Theoretical evaluation of spectral efficiency and outage probability of TDMA multihop cellular systems

For TDMA cellular systems that introduced multihop transmission, the spectral efficiency and outage probability in a single-cell environment are formulated and evaluated numerically. By using approximations, the numerical evaluation is also conducted in an interference-limited multicell environment and compared to simulation results. In formulating these performances, the focus is on the common points of multihop transmission and symbol rate control, and a method similar to the performance evaluation method of rate-adaptive TDMA cellular systems is applied. In particular, the opposite effects of multihop transmission on the spectral efficiency are explicitly considered. In a single cell environment, instead of lowering the spectral efficiency somewhat by the introduction of multihop transmission, the cell coverage satisfying the allowable outage probability could be clearly expanded. A multicell environment could be implemented with cell reuses with a smaller allowable outage probability resulting from the introduction of multihop transmission. Consequently, an improved spectral efficiency is expected. © 2006 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 90(4): 1–10, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.20366