With an ever increasing demand for data rates over limited bandwidth, spectral efficiency (SE) has become one of the main areas of interest in future wireless communication. In this paper, we propose an adaptive pilot spacing scheme for Pilot Symbol Assisted Orthogonal Frequency Division Multiplexing (PSA-OFDM) systems in order to enhance SE while not compromising channel estimate performance. In contrast to traditional approaches, the technique takes into account the frequency selectivity of the user channel and adjusts pilot spacing in frequency domain accordingly. We utilize the existing FFT module at the receiver while exploiting the Nyquist theorem in Fourier domain. For proof of concept, we simulated a PSA-OFDM system under varying degrees of channel frequency selectivity and employed the proposed pilot spacing adaptation technique. The proposed method is compared with block-type pilot transmission in terms of channel estimation Mean Square Error and Bit Error Rate in Rayleigh fading channels. It is shown that a spectral gain of up to 1.75 dB can be achieved by adopting the proposed scheme.
Pilot Spacing Adaptation in OFDM for a Flexible Next Generation Waveform
2020-05-01
138519 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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