Kalyan, Roochika
(2016)
Chase Combining HARQ Process in LTE.
Masters thesis, Indian Institute of Technology Hyderabad.
Abstract
The purpose of LTE is to bring high data rates and embrace quick data transfer and
reliable communication. To achieve reliable communication, LTE has two
mechanisms to detect a
nd correct the errors, which are ARQ and HARQ. This thesis
describes different types of ARQ and HARQ, as well it was described why it is
better to choose particular type of chase combining HARQ. In the implementation of
chase combining HARQ, turbo codes ar
e implemented to get “Near Shannon Limit
Error
-
correcting coding and decoding”. In this thesis, the procedure for Chase
combining HARQ with soft combining, from eNodeB to UE is shown in a block
diagram for easy understanding.
This thesis shows at what SNR
value, what will be
the average number of retransmissions required to deliver data correctly at UE side
with both AWGN channel and Rayleigh fading channel introduced.
It is
successfully shown in this thesis that, how number of times of repetitions of Tur
bo
decoding affect the BLER for particular SNR. It is concluded that, for particular
signal to noise ratio, what will be the number of repetition required at decoder with
what number of retransmission of data, to achieve particular BLER and data rate.
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