Smart hybrid-ARQ (SHARQ) for cooperative communication via distributed relays in LTE-advanced
SPAWC 2011, 12th IEEE International Workshop on Signal Processing Advances in Wireless Communications, June 26-29, 2011, San Fransisco, USA
The work described in this paper proposes two Smart Hybrid-Automatic Repeat Request (SHARQ) schemes with incremental redundancy, that are developed for a dual-hop network of two relays implementing cooperative communication. In a dual-hop network consisting of multiple relays, one of the most challenging tasks is to determine an appropriate trade-off point between the end-to-end block-error rate (BLER) and an additional delay caused due to HARQ retransmissions in two hops. The retransmissions can either be initiated at the relay nodes or at the source node. HARQ protocol for such a network, should therefore be capable of dynamically deciding the node-of-retransmission. The SHARQ schemes proposed here are designed intelligent in a way that they take into account the presence of two relays and the benefit of using cooperative schemes. Basically the system developed here, intends to provide the combined benefits of diversity gain from cooperative schemes and the throughput improvement from SHARQ in a best possible way. This paper explicitly compares the most basic case of single relay system without HARQ and cooperation with the most advanced scenarios of cooperative communication with SHARQ schemes. It is observed that the latter of the two above scenarios results in throughput improvement of almost 4dB in terms of SNR.
| Keywords: | 3GPP, Cooperative Communication, Decode and Forward, Delay Diversity Scheme, Distributed Alamouti Scheme, Hybrid-ARQ, LTE-Advanced, Macro-diversity, MIMO |
| Type: | Conference |
| Language: | English |
| City: | San Fransisco |
| Country: | UNITED STATES |
| Date: | June 2011 |
| Department: | Mobile Communications |
| Eurecom ref: | 3374 |
| Copyright: | © 2011 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. |
| Bibtex: | @inproceedings{EURECOM+3374, doi = {http://dx.doi.org/10.1109/SPAWC.2011.5990443 }, year = {2011}, title = {{S}mart hybrid-{ARQ} ({SHARQ}) for cooperative communication via distributed relays in {LTE}-advanced}, author = {{B}hamri, {A}nkit and {K}altenberger, {F}lorian and {K}nopp, {R}aymond and {H}{\"a}m{\"a}l{\"a}inen, {J}yri}, booktitle = {{SPAWC} 2011, 12th {IEEE} {I}nternational {W}orkshop on {S}ignal {P}rocessing {A}dvances in {W}ireless {C}ommunications, {J}une 26-29, 2011, {S}an {F}ransisco, {USA}}, address = {{S}an {F}ransisco, {UNITED} {STATES}}, month = {06}, url = {http://www.eurecom.fr/publication/3374} } |
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