Title :
Imperfect CSI based two-way AF MIMO relaying of OSTBC
Author :
Arti, M.K. ; Bhatnagar, M.R.
Author_Institution :
Dept. of Electr. Eng., Indian Inst. of Technol. Delhi, New Delhi, India
Abstract :
We consider the two-way relaying of orthogonal space time block codes (OSTBCs) with imperfect channel information. We derive a maximum likelihood (ML) decoder of OSTBC, by assuming perfect channel knowledge at both user nodes. The decoding of OSTBC data at a user terminal is performed by replacing the exact channel state information (CSI) by the estimated CSI, in the ML metric. An approximate closed-form expression for the moment generating function (m.g.f.) of the received signal-to-noise ratio at a user is derived. By using the m.g.f. expression, the analytical average error performance of the scheme is obtained for M-ary phase shift keying constellation. The diversity order of the considered scheme is analytically calculated, for certain system configurations. It is deduced by the simulations and analysis that the channel estimation does not affect the diversity order of the two-way amplify-and-forward multiple-input multiple-output relay system.
Keywords :
MIMO communication; amplify and forward communication; diversity reception; maximum likelihood decoding; orthogonal codes; phase shift keying; relay networks (telecommunication); space-time block codes; M-ary phase shift keying constellation; OSTBC; amplify and forward relay system; approximate closed-form expression; diversity order; imperfect CSI; imperfect channel state information; maximum likelihood decoder; moment generating function; multiple-input multiple-output relay system; orthogonal space time block codes; perfect channel knowledge; received signal-to-noise ratio; two-way AF MIMO relaying; user nodes; user terminal; Channel estimation; Decoding; MIMO; Nickel; Relays; Signal to noise ratio; TV;
Conference_Titel :
Communications (ICC), 2014 IEEE International Conference on
Conference_Location :
Sydney, NSW
DOI :
10.1109/ICC.2014.6884018