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It is well-known that for Single-Input and Single-Output (SISO) narrow-band transmission on frequency-flat fading channels, uncoded communication with only Receiver Channel State Information (Rx-CSI) leads to extremely poor reliability performance whereas Transmitter CSI (Tx-CSI) allows them approach the reliability of an Additive White Gaussian Noise (AWGN) channel via power control. In this paper, the authors propose a novel approach to achieve reliability close to the AWGN channel for uncoded transmissions on SISO frequency-flat Rayleigh fading channels without Tx-CSI. Their approach employs Pseudo-Random Phase Precoding (PRPP) of modulation symbols prior to temporal multiplexing, and joint-detection at the receiver that has polynomial complexity in the precoder size.
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