Patent ID: 6990198
Filing Date: 2006-01-24
Classification: H04B,H04L

Abstract:
1. A terminal for CDMA mobile communication system of IS-95 standard having data protection function, comprising: a vocoder encoding the input analog signal as an information bit having a predetermined size and generating a vocoder packet; an encryptor encrypting the vocoder packet from said vocoder and generating the encrypted vocoder packet; a vocoder framer adding a format bit/format bits indicating the vocoder rate and, as a result, generating the encrypted vocoder frame; a CDMA framer adding a frame quality indicator and the encoder tail bits to the encrypted vocoder frame from said vocoder framer to configure as a CDMA frame; a CDMA frame transmitter transmitting a CDMA frame which passes a convolutional encoder, interleaver, and modulator in sequence, to a base station through an assigned frequency band; a CDMA frame receiver receiving a signal from the base station and reproducing the CDMA frame; a CDMA deframer extracting the encrypted vocoder frame from the CDMA frame reproduced by said CDMA frame receiver; a vocoder deframer deleting a format bit/format bits indicating the vocoder rate from the encrypted vocoder frame and, as a result, extracting the encrypted vocoder packet; a decryptor decrypting the encrypted vocoder packet extracted by said vocoder deframer; and a vocoder decoding the decrypted vocoder packet from said decryptor as an analog signal.