Method and apparatus for precoding channel state information reference signal
A channel state information and reference signal technology, applied in pilot signal allocation, transmission path sub-channel allocation, wireless communication, etc., can solve problems such as insufficient adaptation, and achieve the effect of efficient transmission and reception
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Embodiment 1
[0181] For a 2D bipolar array having a sufficiently small element interval, each polarization (+45 or -45) A (φ, θ) can be written as (see Figure 7 with Figure 8 :
[0182]
[0183] In this case, the quantified channel coefficient is required. The number is 2kl × n RX N F Not 2N r N c × n RX N F . (0) max -θ min ) And (φ max -φ min ) Relative hours, expected KL r N c (This leads to some savings in feedback requirements). This is because for reasonable time span, low mobility UE is positioned by {(φ, θ): φ ∈ [φ min Φ max ] ∧ ∧ ∈ [θ min , Θ max ]} The small corner cone of the defined AOD.
[0184] The proposed scheme operates based on the predetermined basic function / vector of the main collection. The main set is fixed and constructed to cover the entire range of the AOD value, ie {(φ, θ): φ ∈ [0, 2π) ∧ θ ∈ [0, π)}. For a given number of rows and columns (N r N c ), Need at least N r Θ of a value (preferably good spacing span [0, π)) and N c The φ (equally preferred spacing spa...
Embodiment 2
[0189]It is noted that equation 2a and equation 3 promote (or at least encouraging) linear discretization in the AOD domain. Alternatively, the MIMO channel can also be represented as a linear combination of base functions / vectors in the DFT phase difference, which is:
[0190]
[0191]
[0192] Similar to the first embodiment, in the case of a multi-cone configuration, equation 6 and Equation 7 apply each of a plurality of cones.
[0193] Similar to Δ in equation 5, equation 7 r And δ c It is a sampling factor (≥1 integers, 1), which produces overlapping DFT beams in special cases of non-overlapping DFT beams. In this case, the main set associated with equation 6 and equation 7 is given as follows:
[0194]
[0195] L = 0, 1, ..., δ r N r -1, k = 0, 1, ..., δ c N c -1 (8A)
[0196] As described above, the over-sampling factor 1 corresponds to the non-overlapping beam, i.e., the DFT vector of the critical sampling. Similarly, a quantified channel coefficient is required T...
Embodiment 3
[0199] From Embodiment 1 or 2, if the channel in equation 2 / 2b or equation 6 is applied to the channel feature vector without the channel itself, the dimension of the other level can be achieved. This method is shown using equation 2B (the process should be easily expanded to equation 2 or equation 6), the process is as follows:
[0200] ● DL MIMO channels for each polarization and frequency subband perform feature decomposition or singular value decomposition. Here, the channel associated with different receiving antennas is coupled into a channel matrix.
[0201] ● Based on the selected RI (for example, n = 1 or 2), the UE 116 selects N advantageous (strongest) feature vectors (or right-specific vector), and the corresponding feature value is reflected / captured in N CQI value.
[0202] ● Since the UE is located in one or more small codes, each of the N feature vectors (for each polarization and frequency subband) allows the following approximation (see Equation 2B)).
[0203...
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