异步传输网络的频域分块频谱估计算法

Frequency Asynchronous Transmission Network Block Spectrum Estimation Algorithm

异步传输网络间通信信道组成复杂,对异步传输网络间通信信道的频谱的准确估计可以避免不占用多余的频带,能够实现高数据率通信。提出一种基于频域分块和脉冲响应的异步传输网络频谱估计算法。构建异步传输网络通信信道模型为缓慢时变、空变的相干多途信道,采用正交频率复用OFDM训练序列得到确定的起始帧概率分布,采用同步算法能有效减少系统子载波间的正交性抑制,得到系统函数的基本特征传递函数,实现对频域分块频谱估计。仿真结果表明,该算法能有效提高对频谱的估计精度,提高异步传输网络的通信性能,网络异步数据传输的吞吐量大幅提高。

Asynchronous transmission network communication channel between a complex composition, the accurate estimation of frequency spectrum of asynchronous transmission between network communication channel can be avoided without occupying extra band, to achieve a high data rate communication. This paper presents an algorithm to estimate based on asynchronous transmission network spectrum frequency partition and impulse response. Coherent multi-path channel structure of asynchronous transmission network communication channel model for slow time-varying and space varying, adopting orthogonal frequency multiplexing OFDM training sequence to obtain the initial frame to determine the probability distribution, using synchronous algorithm can effectively reduce the orthogonality between sub carrier suppression system, get the basic feature of the system transfer function of the realization of function, estimation of frequency domain division block spectrum. The simulation results show that the algorithm can effectively improve the estimate precision of the spectrum, to improve the communication performance of asynchronous transmission network, the network of asynchronous data transmission throughput substantially increase.