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This paper presents a low-complexity/low-latency algorithm for estimating and tracking time-varying fading channels in Orthogonal Frequency Division Multiplexing (OFDM) systems. More specifically, it is described a decision directed (DD) channel estimation (CE) method, consisting of two main steps: 1) Data detection of the current received OFDM symbol is performed by using the channel coefficients...
We propose a cognitive cooperative scheme based on cognitive relays in the downlink of a time division multiple access (TDMA) system. Cognitive relays utilize the spectrum holes detected via the spectrum detection to relay information, which can share the downlink slots through the frequency-division orthogonal transmission. Therefore, no extra system resources (slots or channels) are allocated for...
Network coding is becoming more and more popular in recent years for its ability to improve network throughput and robustness. In this paper, we propose a scheme of joint network coding and channel coding based on Turbo-BICM over multiple-access channel (MAC). The scheme with only a turbo decoder significantly reduces the complexity of system. Moreover, it can offer the best error performance in the...
Cognitive radio is an emerging technology that allows secondary communication in a frequency band originally allocated to one or more primary users (PUs). Secondary user (SU) usually operates in a low power profile to avoid interference with the PU and sudden appearance of a PU causes loss of data of the SU. Appropriate erasure correction coding (also called as anti-jamming coding) is, thus, required...
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