Title :
Two-Way AF Wireless Relay Networks under Channel Uncertainty
Author :
Kanghee Lee ; Jie Yang ; Kwon, Hyuck M. ; Sawan, Edwin M. ; Hyuncheol Park
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Wichita State Univ., Wichita, KS, USA
Abstract :
Two different two-way amplify-and-forward (AF) wireless relay systems with transmit power constraints at the relay(s) are studied: one- relay system with multiple N antennas between two sources, and multiple N-relay system with one antenna per relay between two sources. The iterative and explicit relay amplifying matrices (or vectors) with perfect cancelation of self- interference under channel uncertainty are determined based on the minimum mean square error (MMSE) criterion. Both iterative and explicit relay amplifying matrices are numerically investigated through the simulation. Simulation results show that the gain of diversity order with channel uncertainty can occur as N increases, while the loss of diversity order can occur as channel estimation error powers increase.
Keywords :
amplify and forward communication; antenna arrays; channel estimation; interference suppression; iterative methods; matrix algebra; mean square error methods; radiofrequency interference; relay networks (telecommunication); vectors; wireless channels; AF wireless relay system; MMSE criterion; channel estimation error; iterative method; minimum mean square error criterion; multiple N antenna; multiple N-relay system; numerical simulation; one-relay system; power constraint transmission; relay amplifying matrix; self-interference cancellation; two-way AF wireless relay network; vector; wireless channel uncertainty; Antennas; Bit error rate; Relay networks (telecommunications); Signal to noise ratio; Uncertainty; Wireless communication;
Conference_Titel :
Vehicular Technology Conference (VTC Spring), 2014 IEEE 79th
Conference_Location :
Seoul
DOI :
10.1109/VTCSpring.2014.7023133
