ETD system

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Tesi etd-03262010-180805


Thesis type
Tesi di laurea specialistica
Author
CORDOVANI, MATTEO
URN
etd-03262010-180805
Title
Integration of HARQ schemes and AMC algorithms for next generation mobile communications
Struttura
INGEGNERIA
Corso di studi
INGEGNERIA DELLE TELECOMUNICAZIONI
Supervisors
relatore Ing. Lottici, Vincenzo
relatore Ing. Stupia, Ivan
relatore Prof. Giannetti, Filippo
Parole chiave
  • LTE
  • AMC
  • turbo code
  • incremental redundancy
  • HARQ
  • ESM
  • mobile communication
Data inizio appello
26/04/2010;
Consultabilità
Parziale
Data di rilascio
26/04/2050
Riassunto analitico
Higher peak data rate and lower latency are targets included in Release 8 Long Term
Evolution (LTE). This thesis is focused on downlink transmission scheme, in which
the interface is BIC-OFDM and SISO based. The HARQ scheme implemented is
multiple parallel stop-and-wait and is built around a CRC code for error detection
Turbo Codes for error correction. AMC algorithms are investigated to allow the
transmitter to vary its mode, compounded by the set modulation and code rate in
order to maximize the goodput, which represents the average number of bits belonging
to error-free data received by unit of time. These algorithms are based on some
feedback information, addressed as Link Quality Metric (LQM). The particular LQM
exploited within this work, the ESM , is effective SNR Mapping (ESM) techniques
based, and has been proved to be a reliable data link level performance predictor
allowing a PER estimation, employing a variety of modulation schemes. Although
the ESM method is reliable, when Turbo Codes are used, it need of an accuracy
calibration, fundamental for a correct estimation of the effective SNR. In this work an
efficient system is conceived when a HARQ Type III scheme is considered, in manner
to adapt the LQM estimation to the mapping block used by the AMC algorithm.
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