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Method and device for rate de-matching
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A Technology of Rate Matching and Rate Matching
Active Publication Date: 2013-10-23
DATANG MOBILE COMM EQUIP CO LTD
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[0019] First, it is completely implemented according to the inverse process of rate matching, which is more complicated, more complicated and error-prone;
[0020] Second, there are multiple data rearrangements in the implementation process, and multiple data copies need to be performed. When copying, data alignment issues also need to be considered, and more caches are required during implementation;
[0021] Third, it is time-consuming. For scenarios where multiple rate matching is required for PDCCH blind detection, the processing time of the terminal will be greatly extended.
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Embodiment 1
[0064] It can be applied to the solution rate matching scheme of short block (that is, less original information bits), such as image 3 As shown, its implementation is as follows:
[0065] Step 31: Generate a solution rate matching mapping table, which can be generated in advance and only needs to be generated once;
[0066] Step 32: Determine whether the length N1 of the input signal sequence that needs to be de-rate-matched is greater than the bit length N2 of the transmitted sequence after encoding and before rate matching, if so, go to step 33, otherwise, use the input signal sequence as a sequence Z, and go to step 34;
[0067] Step 33: dividing the signal sequence into a plurality of sequences whose length is not greater than N2, and accumulating the divided sequences to obtain an accumulated sequence Z;
[0068] Step 34: Perform data rearrangement on the sequence Z according to the pre-generated de-rate-matching mapping table to obtain output sequences K1, K2, and K3...
Embodiment 2
[0070] The process of rate matching is to rearrange, puncture or repeat the encoded transmission signals. In fact, it can be understood as a mapping from sequence Z to Z1. De-rate matching is an inverse process, that is, accumulation, anti-rearrangement, The data that is punched out is filled with 0. Therefore, when using the lookup table to implement rate matching, the key is to generate the rate matching mapping table. This table can be generated in advance according to the length of the original information bits and the rate matching method.
[0071] Scenario assumption: The PDCCH of the LTE system uses a convolutional coding method, the bit length of the DCI is 51 bits, the PDCCH uses a 16-bit CRC check, and the information bit length after adding the check information is 67 bits, using 1 / 3 tailbiting Convolutional encoding, the length of the encoded DCI is 201, and only 201 bytes are needed for the de-rate matching mapping table.
[0083] Scenario assumption: the original information bit length is 67 bits, using 1 / 3 tail-bitingconvolution coding, the de-rate matching mapping table M is 201 bytes, the input signal sequence that needs to be de-rate-matched is Z, and its length is 144;
[0084] The solution rate matching process is as follows:
[0085] Step 1. Initialize the output sequence K of de-rate matching to 0, and the length of K is 201;
[0086] Step 2. Perform data rearrangement on the sequence Z according to the solution rate matching mapping table, K(M(i))=Z(i), i∈[1:144];
[0087] Step 3: Generate output sequences K1, K2 and K3 for de-rate matching, where K1=K[1:67], K2=K[68:134], K3=K[135:201].
[0088] see Figure 4 , an embodiment of the present invention provides a rate matching device, the device includes:
[0089] The input sequence receiving unit 40 is used to receive the input signal sequence that needs to be de-rate-matched; the de-rate matching unit 41 is used to when the length ...
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Abstract
The embodiment of the invention discloses a method and a device for rate de-matching, which relates to the technical field of wireless communication and is used for improving the efficiency of rate de-matching. According to the invention, an inputted signal sequence on which rate de-matching is required to be carried out is received, if the length of the signal sequence is greater than the bit length of a transmitted sequence after coding and before rate matching, the signal sequence is divided into a plurality of sequences whose bit length is not greater than the bit length, then the divided sequences are accumulated to obtain an accumulated sequence; data rearrangement is carried out on the accumulated sequence according to a pre-generated rate de-matching mapping table to obtain an output sequence of rate de-matching; and if the length of the signal sequence is not greater than the bit length of the transmitted sequence after decoding and before rate matching, data rearrangement is carried out on the signal sequence according to the pre-generated rate de-matching mapping table to obtain the output sequence of the rate de-matching. The efficiency of rate de-matching can be effectively improved by adopting the method and the device disclosed by the invention.
Description
technical field [0001] The present invention relates to the field of wireless communication, in particular to a method and device for de-rate matching. Background technique [0002] In the Long Term Evolution (LTE) system, the terminal does not know the current transmission mode, the format (format) of the Physical Downlink Control Channel (Physical Downlink Control Channel, PDDCH) (ie, the control channel element (Control Channel Element, CCE) aggregation level), and the same aggregation level, there are multiple possible starting positions, and there are multiple downlink control information (Downlink Control Information, DCI) at the same time, and the terminal needs to blindly detect the information of the PDCCH. For each different original bit information, each aggregation level, and each different CCE starting position, rate matching needs to be performed once. [0003] In the LTE version (Release9) system, the maximum number of de-rate matching when the terminal blind...
Claims
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