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June 2023
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Lte rach radio link timeout6/2/2023 ![]() We have further reduced the problem's complexity using Kronecker approximation model for channel covariance matrices, thereby, reducing the size of required NN. Instead, we propose to use NN only for \textit coherent combining of the signals in the detector to compensate for the channel effect, thus maximize the signal to noise ratio. We do not replace the whole process of preamble detection by a NN. ![]() In this work, we leverage the system design knowledge and propose a neural network (NN) sequence detector and timing advanced estimator. Since the knowledge of the channel is unknown at this stage, a coherent combining scheme would be very difficult to implement. ![]() Sequences arrived from different antennas and time instances are summed up to reduce the noise variance. The conventional approach is to use matched filters to detect the sequence. In standardized cellular communications systems Zadoff-Chu sequences has been proposed due to their constant amplitude zero autocorrelation (CAZAC) properties. ![]() In wireless communications systems, the user equipment (UE) transmits a random access preamble sequence to the base station (BS) to be detected and synchronized.
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