Title :
Performance of HARQ with AMC Schemes in LTE Downlink
Author :
He, Zhongqiu ; Zhao, Fei
Author_Institution :
Inf. & Commun. Eng. Coll., Harbin Eng. Univ., Harbin, China
Abstract :
The downlink of the Long Term Evolution (LTE) would be OFDMA based and combination of Hybrid ARQ at the data link layer with adaptive modulation and coding (AMC) at the physical layer might be employed. Constellation rearrangement (CR) technique is used in HARQ to enhance MQAM performance. An improved mapping method is used in full IR to enhance system performance. An improved SNR estimation algorithm which reduces computational time is applied to get CQI and corresponding modulation and coding scheme is chosen to maximize throughput performance. Simulation results show that the joint design of AMC and HARQ can achieve considerable spectral efficiency gain.
Keywords :
OFDM modulation; adaptive codes; adaptive modulation; automatic repeat request; frequency division multiple access; AMC; HARQ; LTE downlink; MQAM performance; OFDMA; adaptive modulation and coding; channel quality indicator; constellation rearrangement technique; data link layer; long term evolution; spectral efficiency; Automatic repeat request; Data engineering; Downlink; Educational institutions; Forward error correction; Mobile communication; Modulation coding; Narrowband; OFDM modulation; Throughput; AMC; HARQ; LTE; OFDM;
Conference_Titel :
Communications and Mobile Computing (CMC), 2010 International Conference on
Conference_Location :
Shenzhen
Print_ISBN :
978-1-4244-6327-5
Electronic_ISBN :
978-1-4244-6328-2
DOI :
10.1109/CMC.2010.294
