Title :
A precoding method for closed-loop MIMO-OFDM systems
Author :
Khuong, Nguyen Quoc ; Van Duc, N. ; Trung, Nguyen Quoc ; Tu, Vu Thi Minh
Author_Institution :
Fac. of Electron. & Telecommun., Hanoi Univ. of Technol., Hanoi
Abstract :
This paper presents a precoding method for closed loop MIMO-OFDM systems. For precoding, the codeword is selected by comparing the unitary channel matrix, obtained from the SVD method, with a predefined codebook. The performance of closed and open-loop MIMO-OFDM systems is investigated for the case of perfect and imperfect CSI, as well as for different level of quantization. The simulation results show that the first one outperforms the later one in all case. The system performance gain depends on the number of bits using for feedback channel.
Keywords :
MIMO communication; OFDM modulation; channel coding; feedback; precoding; quantisation (signal); singular value decomposition; CSI quantization; SVD method; channel state information; closed-loop MIMO-OFDM system; feedback channel; multiple-input multiple-output system; open-loop system; orthogonal frequency division multiplexing system; precoding method; singular value decomposition; Adaptive coding; Bandwidth; Channel capacity; Communications technology; Feedback; Frequency; Paper technology; Receiving antennas; Transmitters; Transmitting antennas; CSI - Channel State Information; Closed; Open-Loop MIMO-OFDM system; Precoding; SVD- Singular Value Decomposition;
Conference_Titel :
Advanced Technologies for Communications, 2008. ATC 2008. International Conference on
Conference_Location :
Hanoi
Print_ISBN :
978-1-4244-2680-5
Electronic_ISBN :
978-1-4244-2681-2
DOI :
10.1109/ATC.2008.4760615
