ETD system

Electronic theses and dissertations repository

 

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
Commissione
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<br>Evolution (LTE). This thesis is focused on downlink transmission scheme, in which<br>the interface is BIC-OFDM and SISO based. The HARQ scheme implemented is<br>multiple parallel stop-and-wait and is built around a CRC code for error detection<br>Turbo Codes for error correction. AMC algorithms are investigated to allow the<br>transmitter to vary its mode, compounded by the set modulation and code rate in<br>order to maximize the goodput, which represents the average number of bits belonging<br>to error-free data received by unit of time. These algorithms are based on some<br>feedback information, addressed as Link Quality Metric (LQM). The particular LQM<br>exploited within this work, the ESM , is effective SNR Mapping (ESM) techniques<br>based, and has been proved to be a reliable data link level performance predictor<br>allowing a PER estimation, employing a variety of modulation schemes. Although<br>the ESM method is reliable, when Turbo Codes are used, it need of an accuracy<br>calibration, fundamental for a correct estimation of the effective SNR. In this work an<br>efficient system is conceived when a HARQ Type III scheme is considered, in manner<br>to adapt the LQM estimation to the mapping block used by the AMC algorithm.
File