航空通信中基于PN码的信道估计算法研究

航空移动通信系统（空空信道）中，大的多径时延和多普勒频移会造成非常严重的符号间干扰，高速宽带下尤为突出，使得传统的频域信道估计算法不得不通过提高运算长度和复杂度来实现性能，而航空通信对实时性的要求使其难以工程实现。本文针对空空信道时延长而衰落小的条件，提出一种基于PN码的时域信道估计算法，连续发送N段m序列作为训练序列...

Research on Channel Estimation Algorithms with PN Code in Aviation Communication System

Large Multipath delay and doppler frequency shift of aeronautical communication cause serious inter-symbol interference（ISI）.It＇s even worse in the high speed system, which forces the traditional frequency-domain channel estimation algorithms to increase operation length and complexity achieve expected performance. However, the need of real-time communication makes it difficult to meet the requirements. Taking into consideration the conditions of the large delay and little fading, this paper proposes a time-domain channel estimation algorithm based on PN code, which sends N segments of m-sequence as training sequences and receives with a m-sequence. Theoretical analysis and simulation results show that under the low Snr, MSE has a 6- 8 dB gain than the frequency-domain channel estimation algorithm, and it＇s easy to implement in the FPGA with low complexity.