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Phase rotation and link selection methods are proposed to increase the post-processing signal-to-noise ratio of two-path relay system, in which source and two relays transmit 2-by-2 space-time block coded (STBC) signals. Computer simulation verifies that the proposed methods can provide significant performance enhancement over a naive two-path relay system.
Opportunistic scheduling for wireless network coding (OWNC) combines the strategies of opportunistic scheduling and network coding. This paper applies two variants of OWNC on a two-user OFDMA system. Symbol-based OWNC decides a strategy from sum rate of the whole OFDM symbol. Subcarrier-based OWNC decides a strategy from the capacity on a subcarrier level. Novel algorithms are derived for power allocation...
A two-way relaying OFDM system based on the two-phase, amplify-and-forward protocol is considered. Preambles are designed for each of the sources with the criterion to minimize the Cramer-Rao bound (CRB) of the carrier frequency offset (CFO) estimate. The resulted CRB shows that it is possible for two-way relaying to incur only marginal loss from one-way relaying in CFO estimation under practical...
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