(At present, the primary multiple access method of digital mobile communication network is TDMA, TDMA system (GSMDAMPS), whose spectral efficiency is about 3 times that of the imitation system, limited capacity; 13kbit/s coding is difficult to reach the level of wired telephone in terms of voice quality; TDMA system business overview The ability to perform data and voice summarization is high, but the terminal access rate is limited (up to 9.6kbit/s)
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