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This paper proposes a new physical layer architecture for uplink multiple access based on orthogonal frequency division multiplexing (OFDM). It achieves low peak-to-average power ratio (PAPR) and high reliability with low computational complexity at both the transmitter and receiver, targeting low-latency communications such as transmission of control information in machine-to-machine (M2M) and device-to-device...
Jing and Hassibi introduced a distributed space time block coding scheme for symbol synchronous, coherent, amplify and forward relay networks with half duplex constrained relay nodes. In this two phase transmission scheme, the source transmits a vector of complex symbols to the relays during the first phase and each relay applies a pre-assigned unitary transformation to the received vector or its...
An efficient way to reduce the peak-to-average power ratio (PAPR) in OFDM systems is clipping. After the clipping in an MIMO-OFDM system, the additive noise may not be white. In this paper, we develop fast (single-symbol) ML decoding algorithms for orthogonal space-time block codes (OSTBC) and (linearly transformed) quasi orthogonal space- time block codes (QOSTBC) in clipped MIMO-OFDM systems by...
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