TY - JOUR
T1 - An asymptotically optimal cooperative relay scheme for two-way relaying protocol
AU - Li, Chunguo
AU - Yang, Luxi
AU - Shi, Yuhui
N1 - Funding Information:
Manuscript received August 28, 2009; revised October 06, 2009. First published October 30, 2009; current version published November 18, 2009. This work was supported in partly by the National Basic Research Program of China (2007CB310603), NSFC (60672093, 60702029), and National High Technology Project of China (2007AA01Z262). The associate editor coordinating the review of this manuscript and approving it for publication was Prof. Eduard A. Jorswieck.
PY - 2010
Y1 - 2010
N2 - 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.
AB - 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.
KW - Distributed relays
KW - Relay gain allocation
KW - Self-interference cancellation
KW - Two-way
UR - https://www.scopus.com/pages/publications/79953664197
U2 - 10.1109/LSP.2009.2035382
DO - 10.1109/LSP.2009.2035382
M3 - Article
AN - SCOPUS:79953664197
SN - 1070-9908
VL - 17
SP - 145
EP - 148
JO - IEEE Signal Processing Letters
JF - IEEE Signal Processing Letters
IS - 2
ER -