The Demodulation Reference Signal (DM-RS) pilot pattern in 5G NR uses Orthogonal Cover Codes (OCC) and frequency orthogonal pilot positions to enable channel estimation of different users or spatially multiplexed layers of the same user. These OCCs utilize Walsh-Hadamard codes in a pilot-on-pilot arrangement to introduce code orthogonality. Our work reveals how the choice of the OCC and frequency position of the pilot sequence can improve the channel estimate quality. The key contributor to this improvement is an implicit pattern in the OCC structure which derives from the theory of Orthogonal Variable Spreading Factor codes. With the help of an appropriate denoising and interpolation scheme, the proposed estimation scheme is shown to significantly reduce the Mean Square Error of the channel estimates for various DM-RS configurations.
Exploiting Implicit OVSF Structure in DM-RS for Improved Channel Estimation in 5G NR Systems
2022-06-01
398383 byte
Conference paper
Electronic Resource
English
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