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035 _a.b11794598
099 9 _aAIT RSPR no.TC-00-02
100 0 _aPornthip Jaroenprawat
245 1 4 _aThe pre-repeat technique with error prediction and the time-out control on ARQ schemes in Markov fading channel model
260 _aBangkok :
_bAsian Institute of Technology,
_c2000
300 _a47 p.
490 1 _aResearch studies project report ;
_vno. TC-00-02
500 _aA research study submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Advanced Technologies
502 _aResearch Studies Project Report (M.Eng.) - Asian Institute of Technology, 2000
520 _aDigital cordless-phone systems employ TDMA-TDD under slow fading environments. Because fading affects on both uplink channel and downlink channel almost simultaneously, the occurrence of error in the uplink channel is closely correlated with that in the downlink channel. Therefore, this characteristic can be applied to predict errors in transmitted data. That is, Pre-Repeat (PR) technique for ARQ schemes is proposed by Nakamura (1998). This technique allows to retransmit the copy of data block at the transmitter side, when transmitter predicts that block of data will be corrupted without receiving the negative acknowledgement, right after the error has been detected from received signal. Pre-repeat technique can be used with any of ARQ schemes: go-back-N and selective repeat schemes. However, when a pre-repeated frame is in error and the negative acknowledgement of that frame is lost because of the error on the return channel, large delay for data may still occur. For this reason, the time-out mechanism is added in this research study to eliminate the cause of large transmission delay. In this research study, use of ARQ protocols in packet data transmission in PHS system is considered. Pre-repeat technique with time-out mechanism and only pre-repeat technique based on selective-repeat ARQ protocol are observed on Rayleigh fading channel which modeled as a Markov model. This model is accurate enough to approximate the data block success/failure on a fading mobile radio channel. The simulation results show that pre-repeat technique with time-out mechanism and only pre-repeat technique provides almost the same performance of throughput and average delay. Therefore, pre-repeat technique without time-out mechanism is the most appropriate model to adopt as selective-repeat ARQ protocol since it is simpler to implement.
650 1 0 _aMobile communication systems
700 1 _aMakelainen, Kimmo,
_eChairperson
700 1 _aRajatheva, R.M.A.P,
_eExamination Committee
700 0 _aTeerapat Sanguankotchakorn,
_eExamination Committee
710 2 _aSelf-Support,
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tResearch studies project report ;
_vno. TC-00-02
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B07136
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