Time and Frequency Domain Joint Channel Estimation in Multi-branch Systems
نویسندگان
چکیده
In this paper, the relationship between time and frequency domain joint channel estimation (JCE) in multi-branch, i.e., multi-user and/or multiple antenna, systems is explained. It is proved that the design criterion of optimum pilots for frequency domain JCE can be deduced from the design criterion of optimum pilots for time domain JCE, and vice versa. This uncovers that the optimum pilots in time domain multi-branch systems, after discrete Fourier transform (DFT), will also be the optimum pilots in frequency domain multi-branch systems. Similarly, the optimum pilots in frequency domain multi-branch systems, after inverse discrete Fourier transform (IDFT), will also be the optimum pilots in time domain multi-branch systems. These properties increase the number of available optimum pilots for either time or frequency domain JCE in multi-branch systems. Key-Words: joint channel estimation; multiple antennas; multi-user; pilots; MIMO; OFDM; Multi-branch
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