A NOVEL ORTHOGONAL TRANSMISSION SCHEME FOR NON-ORTHOGONAL MULTI-CARRIER SIGNAL
The orthogonality among sub-carriers and the minimum frequency span which satisfies the Nyquist criterion in frequency domain are foundational principles of conventional OFDM (Orthogonal Frequency Division Multiplexing) system. Although reducing the minimum frequency span in OFDM can improve the spectral efficiency, it is not practical previously because of large detection complexity which is derived from the non-orthogonality and considerable inter carrier interference among sub-carriers. Gram- Schmidt orthogonalization procedure proposed in the paper can transform the non-orthogonal subcarriers into orthogonal waveforms and the bit error rate is not deteriorated in additive white Gaussian noise channel. Meanwhile, the total signal bandwidth becomes smaller than that of conventional OFDM, i.e., the spectral efficiency can be increased. In the paper, Gram-Schmidt orthogonalization procedure is explained by dirty paper coding in information theory and functional analysis in mathematics. Simulation results also verify the validity and correctness of this signal processing method - Gram-Schmidt orthogonalization procedure.
OFDM dirty paper coding Gram-Schmidt orthogonalization procedure
Peijian Zhang Li Fang Wei Jiang Daoben Li
International College, Qingdao University, Qingdao, China Beijing University of Posts and Telecommun Beijing University of Posts and Telecommunications, Beijing, China VIA Telecom, Inc, Beijing, China
国际会议
北京
英文
467-471
2010-10-26（万方平台首次上网日期，不代表论文的发表时间）