Abstract
A time domain channel prediction method exploiting features of sparse channel is proposed for orthogonal frequency division multiplexing (OFDM) systems. The proposed predictor operates in the time domain on each channel tap and separates the negligible taps from significant channel taps before performing prediction. We also compare the proposed prediction method with the classical frequency domain method realized at each OFDM subcarrier and demonstrate that our method increases the prediction accuracy and reduces the computational complexity. Simulations on the physical channel model verify the performance of the proposed method.
Highlights
orthogonal frequency division multiplexing (OFDM) has received considerable interest for its advantages of converting frequency-selective fading channels into a parallel collection of frequency flat subchannels and reducing intersymbol interference (ISI) [1]
The Proposed Time Domain Method In OFDM systems, the entire channel is divided into many narrow parallel subchannels, and so it is easy to understand why the frequency domain methods realize at each OFDM subcarrier as (6)
(4) The Ls significant taps of time domain (Ls-Time domain (TD)) show prediction on each of the Ls significant channel taps, which are selected by the tap selection algorithm
Summary
OFDM has received considerable interest for its advantages of converting frequency-selective fading channels into a parallel collection of frequency flat subchannels and reducing intersymbol interference (ISI) [1]. Wireless channels are often sparse [5]; that is, there are not so many channel taps with significant energy (if compared to the number of subchannels of OFDM), and several approaches have been proposed to exploit this property in channel estimation. This paper presents a new time domain predictor exploiting the features of sparse channel for OFDM systems. The predictor separates the negligible taps from the significant channel taps before performing prediction. (3) Since the number of significant channel taps is much smaller than that of OFDM subcarriers, the proposed time domain method operating on the significant channel taps has a much lower prediction complexity than the frequency domain method.
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