TY - GEN
T1 - Network code assisted HARQ scheme in multi-user systems with cooperative relays
AU - Cheung, Chun
AU - Cheng, Roger S.
PY - 2009
Y1 - 2009
N2 - A multi-user network code assisted HARQ system with cooperative relay is proposed. Uplink (UL) transmission with multiple mobile-stations (MSs) cooperating with a relay-station (RS) using HARQ is considered. The RS is assumed to be able to successfully monitor and decode the packets transmitted from the MSs to the base-station (BS). The BS partitions the incorrectly decoded packets into groups based on their MS-to-BS channel conditions and feedback this partition to the RS along with the acknowledgement (ACK) or negative acknowledgement (NACK). The RS employs, for each group inside the partition, a network-coded HARQ scheme using packets in that group for subsequent retransmissions. We proposed a dynamic and adaptive partitioning method based on the channel state information at the BS and the corresponding HARQ retransmission schemes. Also, we derived the corresponding low-complexity joint demodulation and decoding structure for this multi-user HARQ scheme. We found via simulations that our proposed scheme can improve the system throughput by around 15% when compared with the simple relay assisted chase combining HARQ system.
AB - A multi-user network code assisted HARQ system with cooperative relay is proposed. Uplink (UL) transmission with multiple mobile-stations (MSs) cooperating with a relay-station (RS) using HARQ is considered. The RS is assumed to be able to successfully monitor and decode the packets transmitted from the MSs to the base-station (BS). The BS partitions the incorrectly decoded packets into groups based on their MS-to-BS channel conditions and feedback this partition to the RS along with the acknowledgement (ACK) or negative acknowledgement (NACK). The RS employs, for each group inside the partition, a network-coded HARQ scheme using packets in that group for subsequent retransmissions. We proposed a dynamic and adaptive partitioning method based on the channel state information at the BS and the corresponding HARQ retransmission schemes. Also, we derived the corresponding low-complexity joint demodulation and decoding structure for this multi-user HARQ scheme. We found via simulations that our proposed scheme can improve the system throughput by around 15% when compared with the simple relay assisted chase combining HARQ system.
UR - https://www.scopus.com/pages/publications/74049143866
U2 - 10.1109/PACRIM.2009.5291356
DO - 10.1109/PACRIM.2009.5291356
M3 - Conference Paper published in a book
AN - SCOPUS:74049143866
SN - 9781424445615
T3 - IEEE Pacific RIM Conference on Communications, Computers, and Signal Processing - Proceedings
SP - 290
EP - 295
BT - PACRIM 2009 - 2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing
T2 - PACRIM 2009 - 2009 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing
Y2 - 23 August 2009 through 26 August 2009
ER -