Performance of Channel Estimating Approach in Mobile OFDM System

To analyze the presentation of compressed channel estimation (CCE) based on orthogonal matching pursuit (OMP), They suggest a mathematical structure based on four significant standardization mean square errors (NMSE): complete NMSE (NMSET), NMSE on the dominant channel portion (NMSED), NMSE (NMSEL) caused through "lost error," or NMSE (NMSE F) activated by "false alarms" of deterministic pilot patterns. We then derived a closed-form formula to estimate the upper limit of NMSEDs under ideal conditions (NMSED; UB). NMSE D becomes described by the following four parameters: deterministic pilot mode, maximum Doppler change, and the number of critical multipath components, according to the proposed research system, and can see SNR in NMSE D; UB, if OMP is successful If the probability exceeds a convinced threshold (where can ignore NMSE L and NMSEF ), it is an approximation of the actual NMSE T; using a linear regression model, based on the recommended NMSED, UB can also predict the actual bit error rate performance. We believe that when using OMP-based CCE in a mobile OFDM system, the proposed framework provides a useful tool for adaptive optimization of pilot parameters based on fast time-varying channel conditions.