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公开(公告)号：US09854279B2
公开(公告)日：2017-12-26
申请号：US14847361
申请日：2015-09-08
Inventor： Mihail Petrov , Frank Herrmann , Tomohiro Kimura , Mikihiro Ouchi
IPC: H04N21/23 , H04N21/43 , H04N21/61 , H04N21/236 , H04L12/861 , H04N21/2389 , H04N21/4385 , H04N21/434 , H04L29/06
CPC classification number: H04N21/23608 , H04L49/9057 , H04L49/9094 , H04L69/04 , H04L69/22 , H04N21/2389 , H04N21/4344 , H04N21/4385 , H04N21/6112
Abstract: A demultiplexer 630 routes only one or more transport stream packets with a single packet identifier value to each physical layer pipe. A header compression unit 620 replaces the packet identifier of the transport stream packet with a short packet identifier of one bit length indicating at least whether the transport stream packet is a NULL packet.
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公开(公告)号：US09749104B2
公开(公告)日：2017-08-29
申请号：US14868877
申请日：2015-09-29
Inventor： Mihail Petrov , Tomohiro Kimura , Mikihiro Ouchi
CPC classification number: H04L5/0048 , H04B7/02 , H04B7/0613 , H04L25/0224 , H04L27/2611 , H04L27/2613 , H04L27/2627 , H04L27/2649
Abstract: The present invention relates to orthogonal frequency-division multiplexing (OFDM) communication systems with four transmit antennas and one or more receive antennas, and in particular to methods for inserting scattered pilots (SPs) into the transmit signals of such OFDM systems, for estimating channel properties on the basis of the scattered pilots, a multi-antenna OFDM transmitter, and an OFDM receiver. In this context, it is the particular approach of the present invention to keep the same SP pattern like in the single-transmitter case, to partition the pilots into as many subsets as there are transmitters (transmit antennas), and to interleave these subsets both in time and in frequency. In this manner, the granularity of pilots of the same subset is reduced. This offers increased flexibility in designing the scattered pilot patterns and greater accuracy of the estimated channel properties.
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