2007, Volume 9, Issue 12
Strategic Study of CAE >> 2007, Volume 9, Issue 12
An End to End Modulating Transmission Scheme With Good Robustness Against the RPE-LTP Vocoder
1.东南大学信息安全研究中心，南京210096;2.福建师范大学网络安全与密码技术重点实验室，福州350007,东南大学信息安全研究中心，南京210096,东南大学信息安全研究中心，南京210096,东南大学信息安全研究中心，南京210096
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Abstract
A novel endtoend data transmission scheme based on OFDM mechanism with good robustness against the RPE-LTP vocoder in GSM voice channel is proposed. According to the character of RPE-LTP vocoder, data are modulated to orthogonal lowfrequency sinusoidal carrier. In OFDM, the modulation is done by IFFT and the modulated signals are conformed to the time and frequency characters of RPELTP vocoder. The results of simulation show that the transmission bit rate of the proposed scheme reaches 2.4 kb/s，and the bit error rate of the scheme is lower than 0.3 %. This scheme provides a new approach for realtime secure voice data transmission over GSM system.
Keywords
vocoder ; regular pulse excitedlong term prediction ; OFDM ; FFT
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References
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