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In this paper, we propose a double space-time transmit diversity (DSTTD)-based two-path relay system with power allocation and link combining methods. The two-path relaying protocol can restore spectral efficiency decreased due to the half-duplexing at the relay nodes and the DSTTD method can appropriately achieve the diversity gain from the two paths. To circumvent severe performance degradation...
Recently, there has been great interest in the multicast service where a common content such as video streaming and TV program is intended for multiple users. However, while receiving the common message, the users may also wish to receive their personal messages. Therefore, in this paper, we consider a multiple-antenna base station communicating with two single-antenna users and there are a common...
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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