Abstract: This application relates to a method for designing a non-uniformly spaced linear array antenna. The method includes setting a cost function for spacing between a plurality of antennas comprised in a linear array and for weights for each of the antennas, with limits on side lobe level and bandwidth, and obtaining an initial best solution vector for the cost function under an initial environmental condition based on learning parameters. The method may further include updating the initial best solution vector through reinforcement learning in which a reward value is computed by comparing a sub best solution vector with each of a plurality of solution vectors for the cost function under a sub environmental condition based on the initial best solution vector. The method may further include determining the spacing between the plurality of antennas and the weights for each of the antennas based on the updated initial best solution vector.

Abstract: This application relates to a method for designing a non-uniformly spaced linear array antenna. The method includes setting a cost function for spacing between a plurality of antennas comprised in a linear array and for weights for each of the antennas, with limits on side lobe level and bandwidth, and obtaining an initial best solution vector for the cost function under an initial environmental condition based on learning parameters. The method may further include updating the initial best solution vector through reinforcement learning in which a reward value is computed by comparing a sub best solution vector with each of a plurality of solution vectors for the cost function under a sub environmental condition based on the initial best solution vector. The method may further include determining the spacing between the plurality of antennas and the weights for each of the antennas based on the updated initial best solution vector.

Abstract: A data decoder includes a communication unit receiving a bit signal with encoded data; a first operation unit that bit shifts the bit signal by a first length, corresponding to a length of a spreading code used to encode the data, to generate a first operation stream; a second operation unit generating a second operation stream without the spreading code; a third operation unit that bit shifts the second operation stream by a second length to generate a third operation stream; a fourth operation unit generating a fourth operation stream from which the data is removed using the second operation stream and the third operation stream; and a polynomial generator that decodes the encoded data using the fourth operation stream.

Abstract: The data decoding apparatus includes a communication unit receiving a bit signal with encoded data; a first operation unit performing a bit shift on the bit signal by a first length corresponding to a length of a spreading code used to encode the data to generate a first operation stream; a second operation unit generating a second operation stream from which the spreading code is removed using the bit signal and the first operation stream; a third operation unit performing a bit shift on the second operation stream by a second length to generate a third operation stream; a fourth operation unit generating a fourth operation stream from which the data is removed using the second operation stream and the third operation stream; and a polynomial generator generating a generator polynomial capable of decoding the data encoded using the fourth operation stream.

Abstract: The present disclosure provides a method for estimating OVSF (orthogonal variable spreading factor) code, the method comprises setting an initial value of a spreading factor and an initial value of an index of the spreading factor; extracting a first reception symbol by dechannelizing a reception signal based on a candidate OVSF code corresponding to the set spreading factor and the set index; acquiring a first code domain power of the first reception symbol; acquiring, if the first code domain power is greater than or equal to a predetermined reference value, variance of power of the first reception symbol which is normalized by the first code domain power; and estimating a used OVSF code based on the variance of the normalized power of the first reception symbol.

Abstract: The present disclosure provides a method for estimating OVSF (orthogonal variable spreading factor) code, the method comprises setting an initial value of a spreading factor and an initial value of an index of the spreading factor; extracting a first reception symbol by dechannelizing a reception signal based on a candidate OVSF code corresponding to the set spreading factor and the set index; acquiring a first code domain power of the first reception symbol; acquiring, if the first code domain power is greater than or equal to a predetermined reference value, variance of power of the first reception symbol which is normalized by the first code domain power; and estimating a used OVSF code based on the variance of the normalized power of the first reception symbol.