Narrow-band FM transmission in land mobile radio

The authors describe the narrow-band mobile radio transmission technologies used in NTT's High-Capacity Land Mobile Communications System. These include 12.5 kHz-band analog FM transmission for voice; 2400 b/s data transmission for access and paging control; 100 b/s data transmission for channel associated control; and enhanced cellular technologies such as diversity reception, adaptive transmitter power control, interference evasive intrazone handoff, excess level detection/interzone handoff, and error control schemes in common control channels. Field trial data on power control and handoff are also presented.<
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