The modulator receives the bits from the encryption unit@ see GSM 05.01 [1]@ and produces an RF signal. The filtering of the Radio Frequency (RF) signal necessary to obtain the spectral purity is not defined@ neither are the tolerances associated with the theoretical filter requirements specified. These are contained in GSM 05.05 [4].
PRETS 300 959-1996由ETSI - European Telecommunications Standards Institute 发布于 1996-10-01,并于 2014-04-24 实施。
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