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Spatially common sparsity based adaptive channel estimation and feedback for FDD massive MIMO (0, 2018-02-08)
Spatially common sparsity based adaptive channel estimation and feedback for FDD massive MIMO\energy_avg.m (74, 2016-05-04)
Spatially common sparsity based adaptive channel estimation and feedback for FDD massive MIMO\SAMP_distributed.m (4978, 2016-05-04)
Spatially common sparsity based adaptive channel estimation and feedback for FDD massive MIMO\system_main.m (3875, 2016-05-04)

This simulation code package is mainly used to reproduce the results of the following paper [1]: [1] Z. Gao, L. Dai, W. Dai, B. Shim, and Z. Wang, °Structured compressive sensing based spatio-temporal joint channel estimation for FDD massive MIMO,± IEEE Trans. Commun., vol. ***, no. 2, pp. 601-617, Feb. 2016. If you use this simulation code package in any way, please cite the original paper [1] above. The author in charge of this simulation code pacakge is: Zhen Gao (email: gaozhen16@bit.edu.cn). Reference: We highly respect reproducible research, so we try to provide the simulation codes for our published papers (more information can be found at: http://oa.ee.tsinghua.edu.cn/dailinglong/publications/publications.html). Copyright reserved by the Broadband Communications and Signal Processing Laboratory (led by Dr. Linglong Dai), Tsinghua National Laboratory for Information Science and Technology (TNList), Department of Electronic Engineering, Tsinghua University, Beijing 100084, ***. ********************************************************************************************************************************* Abstract of the paper: Massive MIMO is a promising technique for future 5G communications due to its high spectrum and energy efficiency. To realize its potential performance gain, accurate channel estimation is essential. However, due to massive number of antennas at the base station (BS), the pilot overhead required by conventional channel estimation schemes will be unaffordable, especially for frequency division duplex (FDD) massive MIMO. To overcome this problem, we propose a structured compressive sensing (SCS)-based spatio-temporal joint channel estimation scheme to reduce the required pilot overhead, whereby the spatio-temporal common sparsity of delay-domain MIMO channels is leveraged. Particularly, we first propose the nonorthogonal pilots at the BS under the framework of CS theory to reduce the required pilot overhead. Then, an adaptive structured subspace pursuit (ASSP) algorithm at the user is proposed to jointly estimate channels associated with multiple OFDM symbols from the limited number of pilots, whereby the spatio-temporal common sparsity of MIMO channels is exploited to improve the channel estimation accuracy. Moreover, by exploiting the temporal channel correlation, we propose a space-time adaptive pilot scheme to further reduce the pilot overhead. Additionally, we discuss the proposed channel estimation scheme in multicell scenario. Simulation results demonstrate that the proposed scheme can accurately estimate channels with the reduced pilot overhead, and it is capable of approaching the optimal oracle least squares estimator. Enjoy the reproducible research!

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