Performance analysis of multiuser MIMO OFDM systems incorporating feedback delay and feedback error

Abstract

In multiuser Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM) systems the performance can be improved when full Channel State Information (CSI) is available at the transmitter. The characterization of downlink channel is estimated at the receiver and feedback to the transmitter. But the transmitter may acquire false information due to delay or errors in the feedback channel. The resulting channel capacity loss and Bit Error Rate (BER) performance are evaluated. The BER and the capacity of MIMO-OFDM systems are analyzed by varying the parameters of the system.

Adaptive Modulation in STBC AssistedMIMO-OFDM System using Preamble-BasedSNR Estimator

“…An estimation of Signal-to-Noise-Ratio (SNR) at the receiver can be used as a method to assess the channel condition, whose value can be fed to the transmitter via feedback channel [10]. The authors in [11][12][13] have studied adaptive modulation scheme for MIMO-OFDM systems which demonstrated improvement of spectral efficiency.…”