Title :
Downlink training scheme for massive MIMO systems
Author :
Chen Qian ; Zhaocheng Wang ; Linglong Dai ; Jinhui Chen ; Chen Sun
Author_Institution :
Dept. of Electron. Eng., Tsinghua Univ., Beijing, China
Abstract :
A novel downlink training scheme is proposed for time-division duplex massive MIMO systems. Different from conventional solutions, including the cell-specific reference signal in LTE, the UE-specific reference signal in LTE-A and the commonly used method without the downlink training sequence, the cell-specific demodulation reference signal is proposed by utilising the inherent asymptotic orthogonality, which is shared by all users within one cell and used for the estimation of effective channel coefficients. The training overhead is reduced and the downlink spectral efficiency can be improved considerably.
Keywords :
Long Term Evolution; MIMO communication; cellular radio; channel estimation; demodulation; wireless channels; LTE-A; TDD scheme; UE-specific reference signal; asymptotic orthogonality; cell-specific demodulation reference signal; channel coefficient estimation; downlink spectral efficiency; downlink training scheme; massive MIMO system; multiple-input-multiple-output systems; time-division duplex; training overhead reduction;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2015.1096
