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据日刊《JTR》1987年29卷1期报道:NTT在54.6公里平地和33.4公里近海的共88公里间距内,成功地进行了大容量数字微波系统的现场试验。这种系统频率利用率为10b/s/Hz,传输容量可达400Mb/s(5760条标准电话信道),比现在商用的16QAM
According to the journal JTR 1987, Volume 29, Issue 1, 1987, NTT conducted field trials of high-capacity digital microwave systems successfully within a total of 88 km of 54.6 km of flat and 33.4 km of offshore. This system frequency utilization of 10b / s / Hz, transmission capacity up to 400Mb / s (5760 standard telephone channels), than the current commercial 16QAM