Abstract
In this correspondence, we investigate a two-phase two-way relay protocol for a scenario without channel coding or channel estimation. The considered configuration represents practical sensor networks, where the nodes wish to exchange some low-rate messages (e.g., 1 bit) via a shared relay under strict complexity or latency constraint (corresponding to our assumptions of no-coding and no-channel estimation). A new scheme that incorporates single-threshold noncoherent energy detection and a digital network coding process at the relay node is proposed. Energy detection is optimized for both phases of the protocol, and a threshold that exhibits no error floors is derived in closed form. Numerical results validate the efficiency of the proposed scheme and introduce the two-way relay channel as an efficient structure for noncoherent and uncoded systems as well.
Original language | British English |
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Article number | 6087293 |
Pages (from-to) | 404-409 |
Number of pages | 6 |
Journal | IEEE Transactions on Vehicular Technology |
Volume | 61 |
Issue number | 1 |
DOIs | |
State | Published - Jan 2012 |
Keywords
- Cooperative networks
- noncoherent detection
- two-way relay channel (TWRC)
- uncoded