科研之友
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摘要
In this paper, rain statistics of 10 years record in Taiwan area was used to investigate the transmission performance of the Ka-band LMDS system with QAM modulation. Emphasis was placed to investigate the effects of rain fading under M-QAM modulation schemes. It is found that for LMDS cellular network, M-QAM modulation is difficult to provide an effective and reliable high speed transmission for the case of 6 km radius of cell coverage unless the frequency and polarization diversities are applied; otherwise, the cell coverage of service should be shrunk.
- 出版日期2007
- 单位中央民族大学
