Abstract
This paper faces to the frequency-division-duplex (FDD) three-dimensional (3D) multi-antenna system and proposes a novel downlink channel reconstruction scheme which costs only a small amount of overhead. Uniform planar array (UPA) is employed at the base station (BS) to exploit the 3D space. In the uplink, we first estimate the frequency-independent parameters (delay, vertical and horizontal angles of arrival) by introducing and extending the Newtonized orthogonal matching pursuit (NOMP) algorithm. Both the orthogonal matching pursuit dictionary and the Newton refinement step (NRS) are redesigned according to the spatial propagation model of the signal for the NOMP algorithm. Then, we calculate the downlink gains and feed them back to the BS. The costs for downlink pilots and uplink feedback can be very small. Finally, downlink channel is reconstructed by using the frequency-independent parameters and the downlink gains. Simulation results show that using more antennas helps improve the mean-squared error (MSE) performance of the proposed scheme and can even achieve a better MSE performance than using the linear minimum mean-square error method.
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