| 摘要 |
A pi /4-DQPSK differential phase state encoder/decoder (Codec) is presented which can be implemented using a small number of logic gates. The phase state Codec acts upon data in the transmitter and in the receiver of a pi /4-DQPSK modulating system whereby the use of a look-up table technique or other off-line procedure to ensure proper phase transitions is not required. The phase state Codec is configured to ensure compliance with the IS-54 standard as well as other similar standards.
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