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【正文】 干擾 Center for Wireless Communications (CWC), BUPT 2020/11/17 5 Cells and Sectors Cell Cell Cell Cell Center for Wireless Communications (CWC), BUPT 2020/11/17 6 Cells and Sectors Cell Cell Cell Cell Cell Cell Center for Wireless Communications (CWC), BUPT 2020/11/17 7 Cells and Sectors Sector Sector Sector Cell Center for Wireless Communications (CWC), BUPT 2020/11/17 8 Frequency Reuse in FDMA and TDMA Systems If Cell 1 and Cell 2 were both on the same frequency in conventional cellular systems, the overlap area would have a frequency conflict. Cell 2 Cell 1 Center for Wireless Communications (CWC), BUPT 2020/11/17 9 Frequency Reuse Pattern of N=4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 Center for Wireless Communications (CWC), BUPT 2020/11/17 10 Frequency Reuse Pattern of N=7 D E F G B C D E F B C G D E F C D E B C G A B C F B A A Center for Wireless Communications (CWC), BUPT 2020/11/17 11 同頻干擾 ? 同頻再用比 q: ? 小區(qū)半徑 (R)和相距最近的同頻小區(qū)中心間距離 (D) ? 只考慮第一層干擾,同頻信號干擾比: ? ?為傳播損耗傾斜率 ? 若 ?=4則: ? q的值越小,則容量越大 ? 但是, q值增大 , 同頻干擾減小,傳輸性能提高 3N?? RDq6)(61 ??qqIS ????1)](6[ ISq ?4 23 SN I??Center for Wireless Communications (CWC), BUPT 2020/11/17 12 FDMA/TDMA小區(qū)容量 ? 每個小區(qū)的信道數(shù) K為: ? Bt為系統(tǒng)帶寬 ? Bc為等效每個信道帶寬 ? N為頻率再用因子,即小區(qū)群的小區(qū)數(shù)
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