Frequency-Selective Fading Channel for MIMO and MIMO-OFDM Systems
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This document provides detailed channel characterization and computes impulse response functions for frequency-selective fading channels applicable to Multiple-Input Multiple-Output (MIMO) and MIMO Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems. The implementation involves modeling multipath propagation effects using tapped-delay line filters, where each tap represents a distinct propagation path with specific delay and complex gain. For MIMO configurations, the channel model extends to incorporate spatial correlation matrices between antenna elements. Computational approaches typically employ Rayleigh or Rician fading distributions with Doppler spectrum shaping to simulate time-varying channel characteristics. Key implementation functions include generating complex Gaussian random variables for fading coefficients and applying inverse Fast Fourier Transform (IFFT) operations for frequency-domain to time-domain conversion in OFDM systems.
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