IR-UWB系统中采用锯齿波匹配的低复杂度TOA估计

Low-complexity TOA estimation using sawtooth-waveform matching in non-coherent impulse radio systems

采用非相干能量检测,提出了一种负斜率锯齿波相关搜索的算法,其结合接收多径脉冲信号的包络特征,获得了次优的估计性能。另外,通过对于锯齿波斜率(锯齿波宽度)的分析给出了在非视距条件下无偏估计的条件,理论分析了TOA估计平均绝对误差,推导出其性能解。仿真结果验证了算法的性能,并通过对结果的分析给出了在视距和非视距环境、不同信噪比下锯齿波斜率的最优取值范围。该方法解决了估计复杂度、抗多径和非视距环境下的顽健性问题。

In non-coherent impulse system, an acquisition scheme using negative-slope saw-tooth-waveform matching was proposed. The scheme obtained the sub-optimal estimation performance by utilizing the characteristic of multipath profile. In the proposed scheme, the slope of saw-tooth waveform was analyzed to achieve unbiased estimation in NLOS environment, and the theoretical solution of mean-absolute error （MAE） was derived. Simulations verify the outstanding performance of this scheme in NLOS and low signal-to-noise ratio （SNR） environment.