Title :
A Proposal of New Hybrid ARQ Scheme Using Rate Compatible LDPC Codes for Multi-Hop Transmissions
Author :
Hashimoto, Takayuki ; Wakiyama, Tetsuya ; Ishibashi, Koji ; Wada, Tadahiro
Author_Institution :
Grad. Sch. of Eng., Shizuoka Univ., Hamamatsu, Japan
Abstract :
Multi-hop ad-hoc networks are promising candidates for next generation wireless communications. When using HARQ for multi-hop transmissions, each relay node has to decode received messages and request retransmission to its previous node when it detects errors. Thus, every relay node is required to spend extra power and time because of retransmissions and decodes for collaboration of transmission by the source node. We propose a new HARQ scheme that can reduce the load of the relay nodes but maintain high throughput. In this scheme, every relay node neither decodes the received messages nor requests retransmission to reduce the load. Only the destination node decodes messages by using LDPC codes. RC-LDPC codes, which are suitable for Type-II HARQ, are utilized in the proposed ARQ scheme. Throughput performance of the proposed scheme is evaluated to show its effectiveness.
Keywords :
ad hoc networks; automatic repeat request; parity check codes; RC-LDPC codes; hybrid-ARQ scheme; load reduction; messages decoding; multihop ad-hoc networks; multihop transmissions; rate-compatible LDPC; relay node; source node; throughput performance; type-II HARQ scheme; Ad hoc networks; Automatic repeat request; Decoding; Next generation networking; Parity check codes; Proposals; Relays; Spread spectrum communication; Throughput; Wireless communication;
Conference_Titel :
Vehicular Technology Conference Fall (VTC 2009-Fall), 2009 IEEE 70th
Conference_Location :
Anchorage, AK
Print_ISBN :
978-1-4244-2514-3
Electronic_ISBN :
1090-3038
DOI :
10.1109/VETECF.2009.5378942
