Fast Antenna and Beam Switching Method for mmWave Handsets with Hand Blockage

Shih, Wan-Ting; Wen, Chao-Kai; Shang-Ho,; Цай,; Jin, Shi

doi:10.48550/arxiv.2103.08151

Cited by 1 publication

(3 citation statements)

References 26 publications

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“…Notice that the implementation of this process is similar to that of the greedy searching step and the details are omitted here due to space limitation. Then, the estimated parameters { φi , ψi , τi } can be obtained through a similar operation in (12). Afterwards, the coarse estimation of the cascaded gain ĝi can be obtained as…”

Section: B Nomp Algorithmmentioning

confidence: 99%

“…T , where ξ p = [|g p |, ∠g p , φ p , ψ p , τ p ] T ∈ R 5×1 denotes the unknown parameters of the p-th path, and |g p |, ∠g p separately represent the amplitude and phase of the complex-valued path gain. Then, for an unbiased estimator, the estimation variance is bounded by CRLB, which is the inverse of the 5P × 5P Fisher information matrix (FIM) F (ξ) [12] defined as…”

Section: Performance Analysismentioning

confidence: 99%

“…However, the number of paths to the BS is very small and these paths are characterized by separation in delay in wideband mmWave systems. Hence, we assume that F(ξ) is nonsingular and can be transformed into a block diagonal matrix [12], and each submatrix on the diagonal of F(ξ) can be written as…”

Section: Performance Analysismentioning

confidence: 99%

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Cascaded Channel Estimation for RIS Assisted mmWave MIMO Transmissions

Liu

Zhang

Gao

et al. 2021

Preprint

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Channel estimation is challenging for the reconfigurable intelligence surface (RIS) assisted millimeter wave (mmWave) communications. Since the number of coefficients of the cascaded channels in such systems is closely dependent on the product of the number of base station antennas and the number of RIS elements, the pilot overhead would be prohibitively high. In this letter, we propose a cascaded channel estimation framework for an RIS assisted mmWave multiple-input multiple-output system, where the wideband effect on transmission model is considered. Then, we transform the wideband channel estimation into a parameter recovery problem and use a few pilot symbols to detect the channel parameters by the Newtonized orthogonal matching pursuit algorithm. Moreover, the Cramer-Rao lower bound on the channel estimation is introduced. Numerical results show the effectiveness of the proposed channel estimation scheme.

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Section: B Nomp Algorithmmentioning

confidence: 99%

Section: Performance Analysismentioning

confidence: 99%