Adaptive Overlap-and-Add Technique in MB-OFDM based UWB Receiver Design -- 2
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投稿日: 10年近く前
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Traditional OFDM based transmission system
uses Cyclic Prefix (CP) in an OFDM symbol in order to
maintain orthogonality of transmission. Present days’ Ultra-
Wideband (UWB) systems use Multi-Band OFDM (MBOFDM)
techniques for transmission in application like
Wireless Personal Area Network (WPAN). UWB based systems
are power limited by the regulation of FCC. CP introduces
correlation in the transmitted data sequence and hence
introduces ripples in the power spectral density (PSD) of the
transmitted data. This in turn reduces the range of data
transmission. However, use of zero-pad suffix (ZPS) will have a
flat PSD and hence does not suffer from the range degradation
problem. In the receiver, ZP removal requires use of a
technique called as overlap and add (OLA) in order to capture
the multipath energy of the channel and maintain the
orthogonality in the received data. During transmission, the
length of the ZP is fixed and equal to the channel length.
During reception, in traditional OFDM receiver, the OLA is
done using a ZP length of same as channel length as
transmitted. In UWB receiver the FFT window gets smeared
due to multipath fading and hence estimation of true FFT
window start point does affect the OLA process and hence the
overall system performance. In this paper, we propose a
method which adapts OLA length in UWB receiver depending
on the current band of reception and the band wise estimated
true FFT window start point. The proposed method is more
beneficiary for high delay spread channel like channel model 4
(CM4). In CM4, the technique can achieve around 1 dB Eb/No
gain at 10-2 of BER, while simulated over uncoded MB-OFDM
based UWB system.
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