High efficiency preambles for communications systems over pseudo-stationary communication channels
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A preamble and symbol technology, applied in the field of OFDM data transmission, can solve the problems of occupying network bandwidth and reducing communication channel throughput, etc.
Inactive Publication Date: 2014-09-24
ENTROPIC COMM INC
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[0035] Although preambles must calibrate the receiver and identify the start of data, they take up considerable network bandwidth and reduce the throughput of the communication channel
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[0041] Efficient Preamble
[0042] The MoCA 1.0 preamble shown in Figure 1 and described above has been an industry standard for many years. However, these preambles include inefficiencies that limit the achievable maximum throughput of MoCA networks.
[0043] The high-efficiency preamble described in detail below performs a function similar to the MoCA 1.0 preamble, but achieves higher throughput, more accurate power estimation, and more accurate burst detection times compared to the MoCA 1.0 preamble. In addition, the data throughput of MoCA networks can be further improved by using classification. For example, classification enables a receiving node to predict when a packet will arrive by determining the distance between the receiving node and the sending node. Classification thus enables a receiving node to narrow the window within which incoming data packets are guaranteed to be received, since the receiving node is able to determine when a packet should arrive.
[004...
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Abstract
One method includes appending a preamble to a data packet and sending the preamble and data packet over a communication channel in a network. The preamble can be a beacon, permission, broadcast or high-throughput preamble. The beacon preamble includes the following symbols SS, SS, SS, SS, SS, SS, SS, SS, SS, SS, SS, SS, LS1, LS1, LS1, LS1, LS1, LS1, LS1, LS1, CP0, CEBeacon , CE Beacon. The License Preamble includes the following symbols SS, SS, SS, SS, SS, SS, SS, SS, SS, SS, SS, SS, LS1, LS1, LS1, LS1, LS1, LS1, LS1, LS1, CP0, CE, CE. The broadcast preamble includes the following symbols LS1, LS1, LS1, LS1, CP0, CE, CE. The high-throughput preamble includes the following symbols CP0, CE. SS symbols consist of 64 bits, LS1, LS2 and CP0 symbols consist of 192 bits, CE symbols consist of 512 bits, and CEBeacon symbols are a subset of CE.
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[0001] related application [0002] This application claims U.S. Provisional Application No. 61 / 096,268, filed September 11, 2008, entitled "High efficiency preambles for communications systems over pseudo-stationary communication channels," and filed September 12, 2008, entitled "Parametric construction U.S. Provisional Application No. 61 / 096,435 of PHY-frame preambles on coax" and U.S. Provisional Application No. 61 / 145,076 filed January 15, 2009 entitled "High efficiency preambles for communications systems over pseudo-stationary communication channels" and U.S. Nonprovisional Application No. 12 / 557,288, filed September 10, 2009, entitled "High efficiency preambles for communications systems over pseudo-stationary communication channels." technical field [0003] The disclosed systems and methods relate to data transmission over a network. More specifically, the disclosed systems and methods relate to sending data via Orthogonal Frequency Division Multiplexing (OFDM) with ...
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