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OFDM (orthogonal frequency division multiplexing) can utilize one-tap equalization for multipath (frequency selective) fading and is widely used in many wireless systems today. However, according to the demand for high-mobility communication and the use of higher carrier frequency, the influence of time selectivity of fading is increasing. Therefore, an accurate channel estimation of time and frequency...
This paper studies what is the right relay protocol strategy for a low density parity check (LDPC) cooperative diversity scheme. In this scheme, an improved maximum likelihood detection (MLD) featuring Log-likelihood (LLR) combining technique is also introduced. A basic cooperative diversity scheme of a source node (S), a relay node (R) and a common destination node (D) is considered. This scheme...
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