Chase Combining HARQ Process in LTE

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