无线信道上的语音抗阻塞传输算法  

A Speech Coding and Transmission Algorithm for Defending Wide-band Blocking Interference in Wireless Channel

作　　者：张鑫[1] 田秋玲[1] 崔慧娟[1] 唐昆[1] 

机构地区：[1]清华大学电子工程系微波与数字通信国家重点实验室,北京100084

出　　处：《电声技术》2004年第9期43-46,共4页Audio Engineering

基　　金：国家自然科学基金(60272020).

摘　　要：阻塞干扰是无线信道上数据传输面临的棘手问题。抗阻塞干扰的“滑动窗”语音传输算法将传输码流均匀地分成若干片段,用定长的“滑动窗”在码流上滑动并截取其中的一段连续片段作为某跳频点的数据。接收端比较连续若干跳的重叠部分,判断并恢复“坏跳”数据;对每个片段进行差错控制保护,通过“联合最大后验概率译码”方法抵抗更高误码率的影响。测试表明,在有阻塞干扰的跳频信道上,“滑动窗”算法的性能远远优于传统的RS码纠错算法。A Sliding window algorithm is proposed for the demands of speech communications in Frequency-Hopping(FH)channel with wideband blocking interference. The bit stream to be transmitted is equally divided into slices, with a fixed length 'sliding window' that slides on them. Several slices are taken and transmitted as data of one hop. The overlapped part of the data of consecutive hops is compared and the bad hop decision is made at the receiver. Each slice is error protected, while the Joint Maximum Posterior Probability decoding is applied. Simulations show that the performance of sliding window algorithm is very much better than that of the traditional RS coding algorithm under the same channel conditions.

关 键 词：信源-信道联合编码 阻塞式干扰 滑动窗 低速率语音编码 

分 类 号：TN924.6[电子电信—通信与信息系统]