Techniques for multi-standard cognitive radios on FPGAs

Pham, Thinh Hung

doi:10.32657/10356/65530

Cited by 2 publications

(1 citation statement)

References 60 publications

(99 reference statements)

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“…This step will be described in detail in Section III-A. Second, the guard band is extended [2], [10] by increasing the IFFT size to M times the original IFFT size N. The sampling frequency is also increased by M times to maintain the same subcarrier spacing. This step widens the gap between the main spectrum and adjacent image spectra, which allows a short FIR filter to cancel the image spectra.…”

Section: Proposed Pulse Shaping Schemementioning

confidence: 99%

An efficient spectral leakage filtering for IEEE 802.11af in TV white space

Nguyen

Pham

Hoang

et al. 2018

2018 2nd International Conference on Recent Advances in Signal Processing, Telecommunications &Amp; Computing (SigTelCom)

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Orthogonal frequency division multiplexing (OFDM) has been widely adopted for modern wireless standards and become a key enabling technology for cognitive radios. However, one of its main drawbacks is significant spectral leakage due to the accumulation of multiple sinc-shaped subcarriers. In this paper, we present a novel pulse shaping scheme for efficient spectral leakage suppression in OFDM based physical layer of IEEE 802.11af standard. With conventional pulse shaping filters such as a raised-cosine filter, vestigial symmetry can be used to reduce spectral leakage very effectively. However, these pulse shaping filters require long guard interval, i.e., cyclic prefix in an OFDM system, to avoid inter-symbol interference (ISI), resulting in a loss of spectral efficiency. The proposed pulse shaping method based on asymmetric pulse shaping achieves better spectral leakage suppression and decreases ISI caused by filtering as compared to conventional pulse shaping filters. 1

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Section: Proposed Pulse Shaping Schemementioning

confidence: 99%