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IEEE/ICACT20240375 Slide.08        [Big Slide]       [YouTube]	Oral Presentation
	In the uplink stage, the BS simultaneously receives the pilot signals transmitted by the k users. The pilot signal vector received by the BS is expressed as the formula, where 𝐏¡ôℂ^(𝑁_𝑘¡¿𝑁_𝑘 ) is the pilot pattern. The BS uses minimum mean square error (MMSE) to estimate the channel matrix of the received pilot signals, that is the formula. When P is a unitary matrix, the above estimated channel matrix can be transformed.

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