EP 2540046 A2 20130102 - MULTI-LEVEL MODULATION SYSTEM AND METHOD
Title (en)
MULTI-LEVEL MODULATION SYSTEM AND METHOD
Title (de)
MEHRSTUFIGERMODULATION -SYSTEM UND -VERFAHREN
Title (fr)
SYSTÈME ET PROCÉDÉ DE MODULATION À PLUSIEURS NIVEAUX
Publication
Application
Priority
- GB 201017564 A 20101018
- GB 201003237 A 20100225
- GB 2011050345 W 20110222
Abstract (en)
[origin: GB2478143A] DVB (Digital Video Broadcasting) networks, for example NGH (Next Generation for Handheld), using OFDM (orthogonal frequency division multiplexing) can be deployed as single frequency networks. The invention allows common data (eg networked programs) sent to all/multiple base stations y0-3to be combined with local data h0-1(eg local news) sent to one or a small group of base stations. When only common data is transmitted OFDM sub-carriers use a first modulation94(eg 16QAM). When both common and local data is transmitted sub-carriers are hierarchically modulated into a larger constellation96(eg 64QAM). The QAM constellations may be rotated (Figs. 8-11). Clusters of proximate/adjacent base stations may be arranged to transmit on a TDM (time division multiplexed) basis (Fig. 12). At the receiver (Fig. 21) data streams are separated. The claims relate to receivers in the above system.
IPC 8 full level
H04L 27/34 (2006.01); H04L 5/00 (2006.01)
CPC (source: EP GB)
H04L 5/0001 (2013.01 - EP); H04L 27/2604 (2013.01 - GB); H04L 27/3472 (2013.01 - GB); H04L 27/3488 (2013.01 - EP GB)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
GB 201003237 D0 20100414; GB 2478143 A 20110831; EP 2540046 A2 20130102; GB 201017564 D0 20101201; GB 2478174 A 20110831; TW 201214986 A 20120401; TW I502900 B 20151001; WO 2011104536 A2 20110901; WO 2011104536 A3 20111027
DOCDB simple family (application)
GB 201003237 A 20100225; EP 11706317 A 20110222; GB 201017564 A 20101018; GB 2011050345 W 20110222; TW 100105810 A 20110222