The problem of imaging transmission line impedance profiles for fault location and reconstruction is considered in this study as systems connected by cables and wirings can be prone to deterioration due to various reasons. The objective of this study is to utilize techniques to realize a practical signal that can be sent through a transmission line. This study makes two main contributions in the aspect of designing the transmit signal for profile reconstruction. First, the approach utilized makes use of an adaptive probing sequence. The sequence is constrained to be unimodular and trained to obtain the minimized mean square error between the channel estimate and the true channel response. This is tested and simulated in a baseband system model which shows improvement with the re...[ Read more ]

The problem of imaging transmission line impedance profiles for fault location and reconstruction is considered in this study as systems connected by cables and wirings can be prone to deterioration due to various reasons. The objective of this study is to utilize techniques to realize a practical signal that can be sent through a transmission line. This study makes two main contributions in the aspect of designing the transmit signal for profile reconstruction. First, the approach utilized makes use of an adaptive probing sequence. The sequence is constrained to be unimodular and trained to obtain the minimized mean square error between the channel estimate and the true channel response. This is tested and simulated in a baseband system model which shows improvement with the reconstruction performance. Second, to achieve a practical approach for the reconstruction process, bandlimited passband signals are considered so that the method can be applied to real systems with a limited bandwidth. This imposes a challenge as only limited information is available for profile reconstruction. Therefore, reconstruction strategies for the passband system model are proposed. Results through simulations are provided and it is demonstrated that the use of bandlimited passband signals, with proper treatment to the received signal and channel estimate, can perform well for transmission line impedance profile reconstruction under various conditions.