Patent · US Expired

Data transmission apparatus using a constellation rearrangement

US6892341B2 · kind B2 · utility

38Cited by

18References

22Claims

0Family size

Assignee

Sumitomo Electric Industries, Ltd. · JP

Inventors

Alexander Golitschek · Langen, DE
Christian Wengerter · Kleinheubach, DE
Michael Schmitt · Langen, DE
Eiko Seidel · Darmstadt, DE

Key dates

Filing date	Feb 21, 2001
Grant date	May 10, 2005
Priority date	—
Expiry date	Jul 5, 2021

Classification

Technology area (CPC H)Electricity
CPC primaryH04L27/3472
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

A hybrid ARQ retransmission method involves encoding data packets with a forward error correction (FEC) technique prior to transmission. The data packets are retransmitted based on an automatic repeat request and subsequently soft-combined with previously received erroneous data packets either on a symbol-by-symbol or a bit-by-bit basis. The symbols of the erroneous data packets are modulated by employing a first signal constellation. The symbols of the retransmitted data packets are modulated by employing at least a second signal constellation. Each symbol bit has a mean bit reliability defined by the individual bit reliabilities over all symbols of the predetermined signal constellation. The first constellation and the at least second signal constellation are selected such that the combined mean bit reliabilities for the respective bits of all transmissions are averaged out.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.