Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2006-06-08
2011-11-15
Karikari, Kwasi (Department: 2617)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S277000, C370S282000, C370S458000, C370S441000
Reexamination Certificate
active
08059608
ABSTRACT:
Multiple-In Multiple-Out (MIMO) techniques are used to increase spectral efficiency of a cellular single frequency network. In some embodiments with single transmit antenna per cell, multiple data streams are transmitted from multiple cells, one data stream per set of transmit antennae. The mapping of streams to antenna sets is permuted in time. In this way, user equipment devices (UEs) at cell edges benefit from MIMO, and UEs near cell centers benefit from high carrier-to-interference (C/I) ratio of the signal. In some embodiments, each stream is concurrently transmitted on base layer of a hierarchically modulated signal from one set, and on enhancement layer of a hierarchically modulated signal from another set. The mapping of sets to streams is permuted in time. The UEs at cell edges benefit from MIMO, and the UEs near cell centers benefit from the high C/I to decode both streams from the base and enhancement layers.
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Beladi Sayed H.
Karikari Kwasi
Kim W. Chris
Qualcomm Incorporated
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