Two-Step Approach to Time-Domain Channel Estimation for Wideband Millimeter Wave Systems With Hybrid Architecture

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We consider the problem of time domain (TD) channel estimation for wideband millimeter wave systems with a hybrid architecture. TD channel estimators can exploit both angular and delay domain sparsity, and can perform better than frequency domain (FD) estimators exploiting only angular domain sparsity; however, the former usually require a heavier computational load than the latter. To overcome this difficulty, we propose an efficient, two-step TD channel estimator: in the first step, an effective channel incorporated with beamforming, array responses, and pulse shaping is estimated by the least squares (LS) method; in the second, the desired channel is estimated via an orthogonal matching pursuit (OMP) algorithm. It is analytically shown that the proposed two-step method can yield the same outputs as the original single-step TD estimator when an identity pulse shaping matrix and a unitary pilot matrix are employed. The proposed algorithm is simpler to implement than the other estimators based on OMP, because its sensing matrix is block-diagonal. The simulation results demonstrate that complexity reduction of the proposed method is achieved without (or with minor) performance degradation.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2019-07
Language
English
Article Type
Article
Citation

IEEE TRANSACTIONS ON COMMUNICATIONS, v.67, no.7, pp.5139 - 5152

ISSN
0090-6778
DOI
10.1109/TCOMM.2019.2906873
URI
http://hdl.handle.net/10203/264275
Appears in Collection
EE-Journal Papers(저널논문)
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