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为解决频谱搬移方式接收MBOK DS-UWB信号中的载波同步和定时同步问题,提出一种低复杂度的同步跟踪算法,并通过自适应调整环路带宽对同步性能进行优化。所提的同步跟踪算法使用了M/2+2个MBOK相关器和考虑多径效应的匹配模板与微分模板,实现了最大似然准则下的载波相位和定时偏差的联合估计,算法复杂度较低且计算量不随着Rake接收径数量的增加而增加。所提的基于过零数统计和采样点往复跳动检测的自适应带宽调整算法具有很低的计算复杂度,在不延长环路捕获时间的条件下提高了同步环路的跟踪精度并改善了高信噪比时的误比特率性能。
In order to solve the problem of carrier synchronization and timing synchronization in MBOK DS-UWB signals by spectrum shift, a low complexity synchronization tracking algorithm is proposed and the synchronization performance is optimized by adaptively adjusting the loop bandwidth. The proposed synchronization tracking algorithm uses M / 2 + 2 MBOK correlators and matching templates and differential templates considering multipath effects to achieve joint estimation of carrier phase and timing offset under maximum likelihood criterion. The algorithm complexity is higher Low and the amount of calculation does not increase as the number of Rake receive paths increases. The proposed adaptive bandwidth adjustment algorithm based on zero-crossing number and reciprocal bounce detection of sampling points has a very low computational complexity, improves the tracking accuracy of the synchronous loop and improves the accuracy of the synchronization loop without prolonging the loop acquisition time Bit Error Rate Performance at Signal to Noise Ratio.