帧间卷积交织和帧内块交织级联的时间交织性能评估

为了有效地抵抗时间选择性衰落对信号传输的影响，下一代数字视频广播手持(digital video broadcasting next generation handheld,DVB-NGH)标准计划采用帧间卷积交织和帧内块交织级联的时间交织，以实现兼顾分集颗粒度的灵活长交织。针对级联交织的不同实现方法进行性能比较，仿真评估了终端移动速度和交织深度对级联时间交织误码性能的影响。仿真结果表明，级联交织比块交织具有误码性能好、存储量少、换台时间短的优点，特别适合于移动应用场景。

Performance evaluation of concatenated time interleaver cascading-inter-frame convolutional interleaver and intra-frame block interleaver

In order to effectively resist the influence of time selective fading on the signal transmission, digital video broadcasting next generation handheld (DVB NGH) standard intended to adopt the concatenated time interleaver, which is an inter frame convolutional interleaver followed by an intra frame block interleaver. This concatenated interleaver can achieve fine grained diversity and flexible long time interleaving. The performance of different concatenated interleavers is compared in this paper. In addition, we evaluate the bit error rate (BER) performance under different terminal movement speed and interleaving depth, using the concatenated time interleaving scheme. The simulation results show that the concatenated interleaver outperforms the block interleaver in terms of BER performance, memory requirement and zapping time, which is particularly suitable for mobile application scenarios.