Abstract
In this paper, we propose an adaptive guard interval (GI) for LTE-advanced using channel impulse response (CIR) length estimation. The CIR length is estimated from the channel autocorrelation function. This estimate can be used to generate linear minimum mean square error filter coefficients for data subcarriers channel estimation and to adjust the GI length adaptively. The simulation results show that the improvement of mean square error for signal to noise ratio of 30 dB with CIR length estimation is about 10 dB when compared to conventional methods. Also, due to adaptive GI, the relative spectral efficiency can be increased by 0.11 compared to the conventional system with constant GI.
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