Method for tdetecting signal in communication system and signal receiving apparatus thereof

A method for detecting a signal by a signal receiving apparatus in a communication system, the method comprising:

• detecting matrix multiplications, which are generated by multiplying a part of block diagonal matrices included in a diagonal matrix using Hermitian multiplication of the part of block diagonal matrices, based on at least one channel impulse response (CIR) for a received signal;
• detecting matrix multiplications, which are generated by multiplying remaining block diagonal matrices excluding the part of block diagonal matrices from among block diagonal matrices included in the diagonal matrix using Hermitian multiplication of the remaining block diagonal matrices;
• estimating modulation symbols from the received signal based on the matrix multiplications,
• generating a block diagonal matrix by multiplying one of second matrices included in a first matrix, which is generated by applying a circular extension scheme to a fourth matrix including third matrices, by a fast Fourier transform (FFT) matrix;
• generating a third matrix for one of the modulation symbols, the third matrix includes vectors for channelization codes, which are used in the communication system;
• and
• generating a vector based on the channelization codes or the at least one CIR.

A signal receiving apparatus in a communication system, the signal receiving apparatus comprising:

• a joint detector configured to detect a part of block diagonal matrices included in a diagonal matrix based on at least one channel impulse response (CIR) for a received signal, detect remaining block diagonal matrices excluding the part of block diagonal matrices from among block diagonal matrices of the diagonal matrix, estimate modulation symbols from the received signal based on the diagonal matrix,
• generate a block diagonal matrix by multiplying one of second matrices included in a first matrix, which is generated by applying a circular extension scheme to a fourth matrix including third matrices, by a fast Fourier transform (FFT) matrix,
• generate a third matrix for one of the modulation symbols, the third matrix includes vectors for channelization codes, which are used in the communication system, and
• generate a vector based on the channelization codes or the at least one CIR.