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Numerous studies have shown that a generic communication system is prone to substantial performance loss in the context of strong impulse noise, which is generally not time invariant and is hard to model accurately. A turbo coded orthogonal frequency division multiplexing system in memory impulse channels is investigated in this work. Upon reception of the transmitted data, each of the two proposed...
Previously, a hybrid mechanism employing clipping and turbo coding was vindicated to be remarkably robust against impulse noise, characterized by strong power and frequent occurrence, in Orthogonal Frequency Division Multiplexing systems. This work aims at addressing the impulse noise together with the distortion induced by a more realistic transmitter configuration: Clipping and filtering for the...
Wireless communications in cognitive radio systems are susceptible to in-band interference caused by other communication systems simultaneously sharing partial frequency band. Thus, if not properly coordinated, the CR systems can critically fall short of the guaranteed system performance. This paper proposes a robust and efficient decoding scheme to combat the nuisance without resorting to laborious...
The detriment arising from strong and frequently occurring impulses over an Orthogonal Frequency Division Multiplexing system is paramount because signals on sub-carriers appear to be corrupted simultaneously. To overcome this obstacle, clipping has been reported as an effective approach. Unlike previous works, this work derived the clipping threshold without assuming the a priori knowledge of the...
Space-time modulation exploiting diversity or/and coding gains has been a major focus in high-speed wireless communications systems against channel fading. To avoid channel estimation, we employ noncoherent space-time modulation in single-carrier (SC) block systems over channel frequency-selectivity in this Letter. Capitalizing on multi-channel input-output relation in time domain, we construct space-time...
Space-time trellis coding systems employing orthogonal frequency division multiplexing (OFDM) technique over frequency-selective channels is considered, where the fading gains could vary within a frame interval encompassing a number of OFDM symbol times. The frequency-domain channel time evolution of sub-carriers associated with OFDM symbol is first approximated by a state space model. The per-survivor...
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