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Multi-channel RF transmit coils in combination with parallel transmit techniques produce time-dependent and spatially varying power loss densities in the tissue.
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We transfer these transmit diversity techniques to a cellular environment.
One of the most prominent transmit cooperation techniques applied to VAAs is Space-Time Coding.
In this paper, we compare two transmit diversity techniques, namely, cyclic frequency-shift diversity and bit-interleaving diversity.
In this paper the authors consider two transmit diversity techniques that are possible for coded-OFDM schemes.
Each user is employing transmit diversity techniques, e.g., SC-SFBC, and there is some spectral overlapping between users.
At a mobile terminal the diversity can be increased by using transmit diversity techniques such as cyclic delay diversity (CDD) and space-time coding like Alamouti.
Here, transmit diversity techniques are introduced for HARQ retransmissions; this is because in slow fading environments, retransmitting identically the same packet does not provide additional diversity gain.
A key observation is that multiple transmit antenna techniques are a powerful and efficient way of controlling the disturbance created by the secondary users[12].
So far, the study reviewed in the previous section concentrated on transmit diversity techniques for SU-MIMO transmission, where each mobile station (MS) uses its transmit antennas to improve the performance at a given throughput, making use of the available spatial diversity.
More particularly, transmit diversity techniques are interesting to be applied for users at cell edge experiencing poor propagation conditions; for high mobility users not having access to reliable channel state information (CSI); or, more generally, for the transmission of sensitive data such as control information, where a good reliability is required despite the absence of feedback information.
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