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This study proposes a low-complexity subcarrier-grouping-based multi-level Lloyd-Max (SG-ML-LM) algorithm to reconstruct orthogonal frequency division multiplexing (OFDM) reference signal in passive radar systems. The authors’ previously proposed multi-level Lloyd-Max (ML-LM) algorithm is originally intended to blindly estimate the narrowband flat fading channel coefficients for non-constant modulus...
Recently, Tse and Yates have shown that for a general fading Gaussian broadcast channel with channel states known by the receivers only, binary expansion superposition (BES) signaling with hard decision decoding (HDD) comes within a constant gap to the channel capacity. In this work, we extend the achievability strategy of Tse and Yates by considering the use of soft-decision decoding (SDD) for the...
Opportunistic access to temporarily unused licensed frequency bands has been recognized as a cost-effective solution to mitigate the scarcity of radio spectrum incurred by the proliferation and evolution of wireless devices. In order to accomplish a more efficient spectrum utilization across time, space and frequency, the functionality of spectral awareness is expected to be incorporated into transceivers...
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