590 Effective ICI Mitigation for MIMO-OFDM Systems in Time Varying Channels Based on LMMSE Equalization-Multiple-input Multiple-output orthogonal frequency division multiplexing (MIMO-OFDM), inter-carrier interference (ICI), and time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM)

D Reddy, P Ramashri, Kumar, D Reddy, M Tech, T Ramashri, P Kumar
2017 unpublished
Inorthogonal frequency division multiplexing (OFDM) systems, time varying channels leads to destroy the orthogonality among subcarriers and yielding inter carrier interference (ICI) in OFDM Systems. A time domain approach is used to reduce time variations in ICI-mitigating block. A time domain equalizer (TEQ) is often used at the receiver to mitigate the total response transmission time but the design of TEQ is a difficult task. In this paper, a linear time varying channel is considered to
more » ... ess inter carrier interference and to lower computational complexity. The receiver structure of Time domain Synchronous OFDM is able to estimate the linear time varying channels easily, so TDS-OFDM is suitable for proposed ICI mitigation algorithm. Multi input multi output OFDM system (MIMO-OFDM) needed channel estimation based on Linear Time Varying channel model. Two modulations schemes, QPSK and 16 QAM are used in proposed work to improve performance of two parameters bit error rate (BER) and minimum mean square error (MMSE). Simulation results show that the proposed work can sufficiently suppress the ICI in time varying channels by comparing linear time varying (LTV) channel and linear time invariant (LTI) channel in MIMO-OFDM.
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