LTE Downlink Channel Estimation Algorithms and Implementation

Implementation of LTE downlink channel estimation featuring algorithms including LS (Least Squares), LMMSE (Linear Minimum Mean Square Error), SVD-MMSE (Singular Value Decomposition MMSE), with interpolation techniques such as linear interpolation, second-order interpolation, and cubic spline interpolation.

Multi-User Precoding for MIMO Downlink Based on Block Diagonalization Channel Inversion

Implementation of multi-user precoding for MIMO downlink systems utilizing block diagonalization channel inversion algorithm with code structure and key function explanations.

OFDM Downlink Simulation

OFDM downlink simulation implementing: 1. Generate random transmission data; 2. Digital modulation (BPSK/QPSK/QAM); 3. Serial-to-parallel conversion; 4. IFFT operation using conjugate symmetric vectors for real-valued output simplification; 5. Add cyclic prefix for ISI mitigation; 6. Parallel-to-serial conversion; 7. Transmit filtering (raised cosine/pulse shaping); 8. Add channel noise (AWGN); 9. Receiver serial-to-parallel conversion; 10. Remove cyclic prefix; 11. Perform FFT transformation; 12. Signal demodulation; 13. Bit error rate (BER) calculation.