WAVEFORM FOR USE IN MOBILE AD HOC NETWORKS
First Claim
1. A method of communicating from a node in a mobile ad hoc network comprising:
- identifying a preamble sequence that corresponds to the node, wherein the preamble sequence is constructed to be orthogonal to other preamble sequences corresponding to other nodes of the mobile ad hoc network, wherein the preamble sequence has an ideal auto-correlation property, and wherein the preamble sequence is symmetric in both a real part of the preamble sequence and a complex part of the preamble sequence;
identifying self-discovery data that encodes a signal characteristic with which a data signal will be transmitted to a second node; and
transmitting the preamble sequence followed by the self-discovery data to the second node in an initial transmission.
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Accused Products
Abstract
A waveform and related devices and methods are disclosed for dynamic use of an air interface in a mobile ad hoc network. The waveform includes a dual preamble sequence enclosing self-discovery data that characterizes modulation for a subsequent data signal. The preamble is designed so that the circular correlation of the preamble sequence with itself is an impulse, and the first preamble sequence is a complex conjugate of the second preamble sequence. The preamble sequence can be used to bound a data packet on both sides so that detection of the impulse yields a window in which a data packet can be located, while the self discovery data provides information to extract the data signal from the wireless waveform. In one aspect, the preamble may be implemented using a CHIRP sequence that is a perfect square for more efficient implementation in a wireless modem. In addition, CHIRP sequences for different nodes can be generated with low cross-correlation to reduce interference among nodes in the MANET. The preamble may also support channel sounding or equalization to reverse amplitude or phase distortion in a channel.
41 Citations
21 Claims
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1. A method of communicating from a node in a mobile ad hoc network comprising:
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identifying a preamble sequence that corresponds to the node, wherein the preamble sequence is constructed to be orthogonal to other preamble sequences corresponding to other nodes of the mobile ad hoc network, wherein the preamble sequence has an ideal auto-correlation property, and wherein the preamble sequence is symmetric in both a real part of the preamble sequence and a complex part of the preamble sequence; identifying self-discovery data that encodes a signal characteristic with which a data signal will be transmitted to a second node; and transmitting the preamble sequence followed by the self-discovery data to the second node in an initial transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of communicating from a node in a mobile ad hoc network comprising:
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identifying a preamble sequence that is used at a plurality of nodes of the mobile ad hoc network, wherein the preamble sequence is constructed to be orthogonal to any time-shifted copy of itself, wherein the preamble sequence has an ideal auto-correlation property, and wherein the preamble sequence is symmetric in both a real part of the preamble sequence and a complex part of the preamble sequence; identifying self-discovery data that encodes a signal characteristic with which a data signal will be transmitted to one of the plurality of nodes; and transmitting the preamble sequence followed by the self-discovery data in an initial transmission.
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15. A method of receiving a wireless communication comprising:
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receiving an initial transmission at a node in a mobile ad hoc network, the initial transmission including a preamble sequence corresponding to a second node in the mobile ad hoc network, wherein the preamble sequence is constructed to be orthogonal to other preamble sequences that correspond to other nodes of the mobile ad hoc network;
wherein the preamble sequence has an ideal auto-correlation property; and
wherein the preamble sequence is symmetric in both a real part of the preamble sequence and a complex part of the preamble sequence, the initial transmission further including self-discovery data that encodes a signal characteristic with which a data signal will be transmitted to the node; andbased on the signal characteristic, receiving the data signal. - View Dependent Claims (16, 17, 18, 19, 20)
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21-70. -70. (canceled)
Specification