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An Asymptotically Optimal Cooperative Relay Scheme for Two-Way Relaying Protocol

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3 Author(s)
Chunguo Li ; Sch. of Inf. Sci. & Eng., Southeast Univ., Nanjing, China ; Luxi Yang ; Yuhui Shi

Some of the existing relay schemes for cooperative networks based on one-way relaying protocol are not applicable to the case of two-way relaying protocol. In this letter, a cooperative relay scheme for distributed amplify-and-forward relays working under the two-way relaying protocol is designed in a closed-form, which is asymptotically optimal in the high levels of signal-to-noise ratio (SNR). An upper-bound of the mean squared error (MSE) is derived via a tight approximation of the SNR expression. Based on the minimization of this upper-bound, the two-way relay scheme is then derived as a Rayleigh-Ritz ratio problem. The new relay scheme achieves the minimum MSE for both directional transmissions. Simulation results illustrate the effectiveness of the proposed scheme especially in the high SNR regime.

Published in:

Signal Processing Letters, IEEE  (Volume:17 ,  Issue: 2 )