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Creators/Authors contains: "Omar, Muhammad Shahmeer"

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  1. ; (, IEEE Communications Letters)
    Pilot-aided channel estimation allows the receiver to acquire channel state information (CSI) for each multicarrier block by multiplexing data and pilot symbols in the same block, as long as they can be decoupled. This work proposes several frequency-domain pilot multiplexing techniques to enable independent channel estimation and detection at the receiver for orthogonal chirp division multiplexing (OCDM) transmissions in frequency-selective channels. Analysis shows that each of the proposed schemes is able to achieve the mean squared error (MSE) lower bound for channel estimation and has greater spectral efficiency than the existing schemes for OCDM and chirp spread orthogonal frequency division multiplexing (OFDM). 
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  2. ; (, IEEE Transactions on Wireless Communications)
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  3. ; (, IEEE Wireless Communications Letters)
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  4. ; (, 2020 IEEE 21st International Workshop on Signal Processing Advances in Wireless Communications (SPAWC))
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    Abstract: Orthogonal chirp division multiplexing (OCDM) is a fairly new multi-carrier modulation scheme that has been proposed for optical fiber communications. It spreads data over an entire band using a set of linear chirps that are mutually orthogonal thus achieving the maximum spectral efficiency. This paper analyzes the performance of OCDM in wireless multi-path channels with narrow band interference (NBI) and in doing so shows that linear minimum mean squared error (MMSE) equalization exhibits an interesting signal-to-noise ratio (SNR) dependent degradation in error performance caused by interference amplification at high SNR. Furthermore, it employs a variant of the MMSE equalizer when the interference energy is known to prevent interference amplification and improve the error performance. 
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  5. ; (, 2019 IEEE Global Communications Conference (GLOBECOM))
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