1 research outputs found
Design of Link-Selection Strategies for Buffer-Aided DCSK-SWIPT Relay System
Adaptive link selection for buffer-aided relaying can achieve significant
performance gain compared with the conventional relaying with fixed
transmission criterion. However, most of the existing link-selection strategies
are designed based on perfect channel state information (CSI), which are very
complex by requiring channel estimator. To solve this issue, in this paper, we
investigate a buffer-aided differential chaos-shift-keying based simultaneous
wireless information and power transfer (DCSK-SWIPT) relay system, where a
decode-and-forward protocol is considered and the relay is equipped with a data
buffer and an energy buffer. In particular, we propose two link-selection
protocols for the proposed system based on harvested energy, data-buffer status
and energy-shortage status, where the CSI is replaced by the harvested energy
to avoid the channel estimation and the practical problem of the decoding cost
at the relay is considered. Furthermore, the bit-error-rate (BER) and
average-delay closed-form expressions of the proposed protocols are derived
over multipath Rayleigh fading channels, which are validated via simulations.
Finally, results demonstrate that both the proposed protocols not only provide
better BER performance than the conventional DCSK system and DCSK-SWIPT relay
system but also achieve better BER performance and lower average delay in
comparison to the conventional signal-to-noise-ratio-based buffer-aided
DCSK-SWIPT relay systems