Ultra-low power data transmission method and apparatus
AssigneeElectronics and Telecommunications Research Institute
InventorsPansoo KIM, Soo Yeob JUNG, Joon Gyu RYU
Life of this patent
Estimating the term…
Abstract
An ultra-low power data transmission method and apparatus are disclosed. An ultra-low power data transmission method to be performed by a user terminal of an ultra-low power data transmission system includes performing channel coding on a payload included in a transmission packet; interleaving a payload obtained through the channel coding, spreading the interleaved payload using a gold code and an orthogonal variable spreading factor (OVSF), combining a synchronization header spread using the gold code and the OVSF with the spread payload, and modulating a transmission packet in which the payload and the synchronization header are combined.
Claims13
An ultra-low power data transmission method to be performed by a user terminal of an ultra-low power data transmission system, the ultra-low power data transmission method comprising:
- receiving downlink signals through a satellite network and a terrestrial network, respectively;
- identifying received power of each of the received downlink signals;
- and
- transmitting, to a gateway, collected data through one of the satellite network and the terrestrial network based on the identified received power of the downlink signals,
- wherein the transmitting is performed using a different channel code and a preamble sequence based on a type of the network to be used for the transmitting.
An ultra-low power data transmission method to be performed by a user terminal of an ultra-low power data transmission system, the ultra-low power data transmission method comprising:
- for transmitting collected data through a satellite network, performing channel coding on a payload comprised in a transmission packet having a predetermined length;
- interleaving a payload obtained through the channel coding;
- spreading the interleaved payload using a gold code and an orthogonal variable spreading factor (OVSF);
- spreading a preamble sequence of a synchronization header comprised in the transmission packet using the gold code and the OVSF;
- combining a synchronization header comprising the spread preamble sequence with the spread payload;
- and
- modulating a transmission packet in which the payload and the synchronization header are combined.
An ultra-low power data reception method to be performed by a gateway of an ultra-low powder data transmission system, the ultra-low power data reception method comprising:
- identifying a transmission packet received through a satellite using a preamble of the transmission packet;
- performing a coarse synchronization on the identified transmission packet;
- de-spreading a transmission packet obtained through the coarse synchronization;
- performing a fine synchronization on the despread transmission packet;
- calculating a log-likelihood ratio (LLR) of a transmission packet obtained through the fine synchronization;
- de-interleaving the transmission packet based on the calculated LLR;
- and
- performing channel decoding on the de-interleaved transmission packet.
Dependencies are inferred from the claim text.