TY - GEN
T1 - Bit allocation and pairing methods for distributed antenna systems with limited feedback
AU - Lee, Hoon
AU - Park, Eunsung
AU - Park, Haewook
AU - Lee, Inkyu
PY - 2014/11/24
Y1 - 2014/11/24
N2 - In this paper, we study bit allocation and pairing methods based on zero forcing beamforming for downlink multiuser distributed antenna systems with limited feedback. Before assigning the feedback bit for each distributed antenna (DA) port, we need to solve the pairing issue which determines the set of DA ports to support a user. To this end, we first analyze an upper bound of a mean rate loss between perfect channel state information systems and limited feedback systems. Since minimizing the obtained bound is a joint optimization problem with respect to the pairing and the bit allocation, it is difficult to identify a solution analytically. Instead, we propose a two-step algorithm which derives the pairing based on the bound of the rate loss, and then obtain the feedback bit allocation method independently. From simulation results, we confirm that the proposed algorithms offer about 135% performance gains over a conventional equal bit allocation scheme for 5 DA ports systems. andcopy; 2014 IEEE.
AB - In this paper, we study bit allocation and pairing methods based on zero forcing beamforming for downlink multiuser distributed antenna systems with limited feedback. Before assigning the feedback bit for each distributed antenna (DA) port, we need to solve the pairing issue which determines the set of DA ports to support a user. To this end, we first analyze an upper bound of a mean rate loss between perfect channel state information systems and limited feedback systems. Since minimizing the obtained bound is a joint optimization problem with respect to the pairing and the bit allocation, it is difficult to identify a solution analytically. Instead, we propose a two-step algorithm which derives the pairing based on the bound of the rate loss, and then obtain the feedback bit allocation method independently. From simulation results, we confirm that the proposed algorithms offer about 135% performance gains over a conventional equal bit allocation scheme for 5 DA ports systems. andcopy; 2014 IEEE.
UR - http://www.scopus.com/inward/record.url?scp=84919460374&partnerID=8YFLogxK
U2 - 10.1109/VTCFall.2014.6965894
DO - 10.1109/VTCFall.2014.6965894
M3 - Conference contribution
AN - SCOPUS:84919460374
T3 - IEEE Vehicular Technology Conference
BT - 2014 IEEE 80th Vehicular Technology Conference, VTC2014-Fall, Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 80th IEEE Vehicular Technology Conference, VTC 2014-Fall
Y2 - 14 September 2014 through 17 September 2014
ER -