The effective method of computing the soft-decision metrics in the system with quadrature amplitude modulation

• Autorzy: Kliks A.
• Konferencja: Poznan Telecommunications Workshop / sympozjum [11; December 7-8, 2006; Poznan]
• Języki publikacji: EN

Abstrakty

EN

The decision on a transmitted symbol is one of the key points in the decoding process of the received signal. The block of demapper, that is responsible for mapping of the constellation points to the binary blocks, produces either the binary data blocks or a set of metrics on its outputs. In this paper, the optimal iterative algorithm of finding the minimal set of metrics - when the data QAM symbols are coded with Grey code - is discussed. At the beginning, the description of OFDM systems and the channel influence on the data transmission in such systems are presented. Then, the main idea of finding metrics is described in detail. The obtained results are discussed and summarized in the conclusion.

Słowa kluczowe

EN

soft-decision; metric; constellation point; QAM

• Wydawca: Wydawnictwo Politechniki Poznańskiej
• Czasopismo: Poznan University of Technology Academic Journals. Electrical Engineering
• Rocznik: 2007
• Tom: No 54
• Strony: 81--87
• Opis fizyczny: Bibliogr. 3 poz.

Twórcy

autor

Kliks A.

• Poznan University of Technology

Bibliografia

• [1]Engels V., May T., Rohling H.: Performance Analysis of Viterbi Decoding for 64-DAPSK and 64-QAM Modulated OFDM Signals, IEEE Trans. Commun., vol.46, p. 182-190, February 1998
• [2]ETSI EN 300 744 vl.5.1, Digital Video Broadcasting (DBV); Flaming structure, channel coding and modulation for digital terrestrial television, November 2004.
• [3]Proakis J.G..: Digital communication, MacGraw-Hill, New York, 1995.