Title :
Performance Analysis of Two-Way AF MIMO Relaying of OSTBCs With Imperfect Channel Gains
Author :
Arti, M.K. ; Bhatnagar, M.R.
Author_Institution :
Dept. of Electr. Eng., Indian Inst. of Technol. Delhi, New Delhi, India
Abstract :
In this paper, we consider the relaying of orthogonal space-time block codes (OSTBCs) in a two-way amplify-and-forward (AF) multiple-input-multiple-output (MIMO) relay system with estimated channel state information (CSI). A simple four-phase protocol is used for training and OSTBC data transmission. Decoding of OSTBC data at a user terminal is performed by replacing the exact CSI by the estimated CSI in a maximum-likelihood (ML) decoder. Tight approximations for the moment-generating function (MGF) of the received signal-to-noise ratio (SNR) at a user is derived under Rayleigh fading by ignoring the higher order noise terms. Analytical average error performance of the considered cooperative scheme is derived by using the MGF expression. Moreover, the analytical diversity order of the considered scheme is also obtained for certain system configurations. It is shown by simulations and analysis that the channel estimation does not affect the diversity order of the OSTBC-based two-way AF MIMO relay system.
Keywords :
MIMO communication; Rayleigh channels; amplify and forward communication; approximation theory; channel coding; channel estimation; cooperative communication; maximum likelihood decoding; orthogonal codes; protocols; relay networks (telecommunication); space-time block codes; CSI estimation; MGF; ML decoder; OSTBC data transmission; Rayleigh fading Channel; SNR; analytical average error performance; approximation theory; channel state information estimation; cooperative scheme; four-phase protocol; imperfect channel gain; maximum-likelihood decoder; moment-generating function; orthogonal space-time block code; signal-to-noise ratio; two-way AF MIMO relay system; two-way amplify-and-forward multiple-input-multiple-output relay system; Bit error rate; Channel estimation; Decoding; MIMO; Nickel; Noise; Relays; Amplify-and-forward (AF) protocol; M-ary phase-shift keying (M-PSK); Rayleigh fading, symbol error rate (SER); channel estimation; cooperative diversity; multiple-input??multiple-output (MIMO) system; orthogonal space-time block codes (OSTBCs); two-way relaying;
Journal_Title :
Vehicular Technology, IEEE Transactions on
DOI :
10.1109/TVT.2014.2308638