Method and device for processing dmrs signal in wireless communication system
A technology for processing devices and signals, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve problems such as OFDM symbol imbalance, and achieve the effect of reducing the imbalance between OFDM symbols
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example 1
[0066] Among them, E i for:
[0067]
[0068] Obviously, E i Satisfy the conditions of the above formula (2), then if figure 2 As shown, the OCC rotation pattern is:
[0069] we 0 =[a b c d]
[0070] we 1 =[d c b a]
[0071] we 2 =[c d a b]
[0072] we 3 =[b a d c]
[0073] Here, as shown in the following formula, we can easily verify that the transmit power among the DMRS symbols after column permutation in this example is the same.
[0074]
[0075] If the number of PRBs is an integer multiple of 4, the rotated DMRS OCC pattern (hereinafter referred to as "OCC pattern") based on this example eliminates the problem of power jitter between different symbols. Substituting the above rotated OCC pattern into the original walsh matrix, it can be seen in this example that port 7 / 8 still maintains the same rotation pattern as R12 The DMRS OCC pattern transformation on port 11 / 13 is:
[0076]
[0077]
[0078] As a preferred solution, since the OCC pattern ...
example 2
[0081] In this example, E i for:
[0082]
[0083] Similarly, E i The condition of formula (2) is also satisfied. The OCC rotation pattern is:
[0084] we 0 =[a b c d]
[0085] we 1 =[d a b c]
[0086] we 2 =[c d a b]
[0087] we 3=[b c d a]
[0088] It can be seen that the above OCC rotation pattern is a form of cyclic displacement, and it can be easily verified that the OCC rotation pattern based on this example also eliminates the problem of power jitter between different symbols, and does not change the port 7 / 8 defined in R12 rotation pattern.
[0089] Since DMRS enhancement technology has a PRB in each OFDM symbol In the case of four REs, the column permutation method can only achieve power balance in PRBs whose number is an integer multiple of 4. This also requires certain restrictions on the channel frequency selectivity, that is, requires that the channel frequency selectivity characteristics be basically the same in the four PRBs. To solve this prob...
example 3
[0107] Preferably, in order to be compatible with the previous user equipment, the OCC pattern on the subcarrier corresponding to port 7 / 8 must be consistent with the current R12 pattern. So the first 2 columns of matrix F must be:
[0108]
[0109] For example, when M=6, the F matrix is set to:
[0110]
[0111] where, t=e -jπ / 3 .
[0112] Using the above F matrix, since the first two columns of the F matrix are the same as the OCC pattern of the existing R12 version, it can be compatible with the user equipment of R12 and earlier versions in the DMRS enhancement technology, and at the same time eliminate the power difference between OFDM symbols in the DMRS. A matter of balance.
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