Lg Electronics Inc.

Ilmin Kim

Byounghoon Kim

Joonkui Ahn

Daesung Hwang

Kijun Kim

Bonghoe Kim

Kwangseok Noh

A method for transmitting data on the basis of polar coding in a wireless communication system, according to the present disclosure may comprise the steps of: transmitting data including a plurality of information blocks, each of which contains a corresponding cyclic redundancy check (CRC); receiving a hybrid automatic repeat request acknowledgement/negative acknowledgement (HARQ ACK/NACK) of the transmitted data; performing learning in order to retransmit the plurality of information blocks; and retransmitting the plurality of information blocks on the basis of the HARQ ACK/NACK, wherein the step of performing learning comprises the steps of: obtaining current state s; obtaining actions to be applied to current state s; and selecting, from the actions, an action maximizing expected reward value Q, wherein expected reward value Qis obtained on the basis of rewards R, R, . . . , Rcorresponding to states s, s, . . . , s, and the plurality of information blocks is retransmitted on the basis of the selected action.

Method and apparatus for transmitting data on basis of polar coding in wireless communication system

A method and apparatus for providing a security communication are provided. A device generates an output bit sequence by applying a polar code scheme to an input bit sequence and transmit the output bit sequence to a target receiver. The output bit sequence is generagted based on a double layer polar coding scheme.

Security communication using polar code scheme

A method and apparatus for providing a secure transmission based on a polar code are provided. A device generates an output bit sequence by applying a polar code generator matrix to an input bit sequence and transmits the output bit sequence to a target receiver. The input bit sequence includes first information bits, second information bits and third information bits. The first information bits correspond to gray bit channels for the target receiver and bad bit channels for an eavesdropper. The third information bits correspond to good bit channels for the target receiver and gray bit channels for the eavesdropper.

Method and device for providing secure transmission based on polar code

Provided is a method for performing Hybrid Automatic Repeat Request (HARQ) by a data transmitting terminal in a wireless communication system. The terminal transmits data using a specific code word selected from a plurality of code words included in a mother code, calculates a Bit Error Rate (BER) upper bound for a receiving terminal that receives the data, calculates a BER lower bound for another terminal that is able to eavesdrop the data, and performs the HARQ based on whether the BER upper bound is greater than a BER reference level for the receiving terminal and whether a probability of the BER lower bound being less than the BER reference level for the another terminal is less than a predetermined value.

Secure communication method and system based on bit error probability

There is a provided a method for deciding transmission power to securely transmit data, the method comprising: determining a transmission rate toward an intended receiver, based on an upper limit of a decoding error probability of the intended receiver and a lower limit of a decoding error probability of an unwanted over hearer; and deciding a transmission power toward the intended receiver based on the upper limit and the lower limit. Here, if the upper limit is lower than the lower limit, the transmission toward the intended receiver is not performed.

Method for determining transmission power

The present invention develops a wireless communication transmitting scheme which allows a desired receiver to stably receive data so that data are not tapped by a third party when a transmitter transmits data to the receiver in a wireless scheme. In particular, the third party not a desired receiver taps, a bit error probability of received data is maintained to have about 50%, so that the third party cannot substantially obtain valid data. A suggested scheme of the present invention may transmit security data in a state that a transmitter and a receiver do not have a secret key unlike an existing cryptography.

Growing community of inventors

Seoul, South Korea

Ilmin Kim