Packet data transmission with optimum preamble length
View Patent ↗In a communication network, a sending node transmits a message with a multisegment preamble and data to a receiving node. The receiving node calculates characteristics of the sending unit, channel, or transmitted signal by processing preamble segments. Once an unknown characteristic is determined, a segment of the preamble can be eliminated or reduced in length for subsequent messages, which increases efficiency of the message transmissions.
1. A method of transmitting message packets from a sending node to a receiving node comprising the steps of:
in a sending node, forming an initial message packet comprising the concatenation of:
a message packet preamble comprising a plurality of segments; and
a data field comprising a plurality of data symbols;
transmitting the initial message packet;
in a receiving node, detecting the initial message packet and from the detected initial message packet, determining at least one unknown signal characteristic of the initial message packet;
transmitting to the sending node an indication that an unknown characteristic has been determined;
receiving in the sending node the indication that the unknown characteristic has been determined;
in the sending node, in response to receiving the indication, forming an optimized message packet by removing at least one segment from the preamble of the initial message packet;
transmitting the optimized message packet.
2. A method of transmitting message packets from a sending node to a receiving node comprising the steps of:
in a sending node, forming an initial message packet comprising the concatenation of
a time domain preamble comprising a short training sequence, long training sequence, and correlator sequence transmitted as a series of quadrature phase shift keyed (QPSK) symbols;
frequency domain preamble comprises a plurality of orthogonal frequency division multiplex (OFDM) symbols transmitted with a cyclic prefix; and
a data section comprising a plurality of data symbols transmitted as OFDM symbols; and
transmitting the initial message packet;
in a receiving node, detecting the initial message packet and determining at least one unknown signal characteristic of the initial message packet;
transmitting to the sending node an indication that an unknown characteristic has been determined;
in the sending node, in response to receiving the indication, forming an optimized message packet by removing at least one segment from the preamble of the initial message packet; and
transmitting the optimized message packet.
3. A method for transmitting message packets from a sending node comprising the steps of:
in the sending node, forming an initial message packet comprising the concatenation of:
a message packet preamble comprising a plurality of segments;
a data field comprising a plurality of data symbols;
transmitting the initial message packet using signals;
in response to the transmission of the initial message packet, receiving an indication that a signal characteristic associated with signals used to transmit the message packet has been determined;
in the sending node, in response to receiving the indication, forming an optimized message packet by removing at least one segment from the preamble of the initial message packet; and
transmitting the optimized message packet.