面向蓝牙语音加密传输的波形码本设计

Waveform codebook design for Bluetooth voice encryption

针对蓝牙语音信号加密后失去语音特征而不能通过语音信道传输的问题,建立蓝牙语音加密数据传输模型,提出一种面向蓝牙语音加密传输的波形码本生成算法。该算法以子载波调制生成初始调制码本,训练数据得到解调码本,通过设计末位淘汰机制的粒子对算法寻找最优码本。仿真分析表明该码本生成算法具有收敛速度快的优势,能够生成不同比特传输速率和符号错误率低的波形码本。实验结果表明,在蓝牙中使用该波形码本传输数据具有较低的符号错误率。

Aiming at the problem that the Bluetooth voice signal cannot be transmitted through the voice channel after being encrypted,this paper established a Bluetooth voice encryption data transmission model,and proposed a waveform codebook generation algorithm for Bluetooth voice encryption transmission.The algorithm used subcarrier modulation to generate the initial modulation codebook,and trained data to obtain the demodulation codebook.It designed the particle-pair algorithm with the last elimination mechanism to find the optimal codebook.Simulation analysis shows that the proposed algorithm has the advantages of fast convergence rate and can generate waveform codebooks with different bit transmission rate and low symbol error rate.Experiments show that using this waveform codebook to transmit data in Bluetooth has low symbol error rate.