Abstract
Transmission Code Design for Asynchronous Full-Duplex Relaying
Highlights
The full-duplex transmission mode has been investigated to provide high data rate and diversity gain in relay systems [1,2,3,4,5,6]
Many efforts have been exerted at cancelling the self- interference [8,9,10,11,12], and current self-interference cancellation can be achieved in the range between 66 and 74 dB [13]
As discussed in [13], given the large residual selfinterference (RSI), the 66 dB cancellation is insufficient for full-duplex relay systems to outperform half-duplex relay systems in terms of data rate
Summary
The full-duplex transmission mode has been investigated to provide high data rate and diversity gain in relay systems [1,2,3,4,5,6]. The delay difference between the relay and the direct links results in asynchronous transmission Such asynchronous transmission may cause two problems: a loss in diversity and an increase in decoding complexity. The channel fading and delay coefficient of the direct link are hSD and τSD, respectively; those between the source and the relay are hSR and τSR, respectively; and those between the relay and the destination are hRD and τRD, respectively. Residual Self-Interference The relay works in full-duplex mode, which means that the relay simultaneously receives and transmits signals within the same frequency. The selfinterference can be millions of times stronger (60 dB or more) than a received signal In such case, nearly 100 dB cancellation of self-interference is required to ensure the 30 dB gap in the signal and interference plus noise.
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