Channel state information compression method and device
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A technology of channel state information and state transition, applied in the field of communication, can solve problems such as low compression rate, and achieve the effects of enhancing dynamic adjustment, improving coding efficiency, and reducing coding length
Inactive Publication Date: 2011-08-24
HUAWEI TECH CO LTD
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[0004] As we all know, Huffman coding is a variable-length coding, and the code word length is related to the occurrence probability of the coding object. The smaller it is, the longer the codeword is
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Embodiment 1
[0030] see figure 2 , a method for channel state information compression, the specific steps are as follows:
[0031] Step 101, searching for a replaced codeword from the Huffman coding codebook, the occurrence probability of the replaced codeword is less than a preset threshold;
[0032] Wherein, the Huffman coding codebook includes state transitions between quantization results of channel state information and corresponding codewords.
[0033] Step 102, calculate the Euclidean distance between the replaced codeword and other codewords in the Huffman codebook, and select a replacement codeword according to the calculation result, and the replacement codeword is the code with the smallest Euclidean distance to the replaced codeword Character;
[0034] Step 103, in the Huffman coding codebook, use the replacement codeword to replace the replaced codeword, and add the occurrence probability of the replaced codeword to the occurrence probability of the replacement codeword to ...
Embodiment 2
[0083] see Figure 5 , a device for compressing channel state information, the device comprising: a search module 30, a calculation selection module 31, a codebook processing module 32 and an encoding module 33;
[0084] A search module 30, configured to search for a replaced codeword from the Huffman codebook, the probability of occurrence of the replaced codeword being less than a preset threshold;
[0085] Wherein, the Huffman coding codebook includes state transitions between quantization results of channel state information and corresponding codewords.
[0086] Calculation and selection module 31 is used to calculate the Euclidean distance between the replaced codeword obtained in the search module 30 and other codewords in the Huffman codebook, and selects the replacement codeword according to the calculation result, and the replacement codeword is the same as The codeword with the smallest Euclidean distance of the replaced codeword;
[0087] The codebook processing m...
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Abstract
The invention discloses a channel state information compression method and a channel state information compression device, which belong to the field of wireless communication. The method comprises the following steps of: searching for a replaced code word from a Huffman coding codebook, wherein the probability of occurrence of the replaced code word is less than a preset threshold value; calculating Euclidean distances between the replaced code word and each of the other code words in the Huffman coding codebook, selecting a replacement code word according to calculation results, and replacing the replaced code word by utilizing the replacement code word, thereby obtaining a processed Huffman coding codebook; and coding the channel state information quantification result of a current moment according to the processed Huffman coding codebook and the channel state information quantification result of the previous moment. In the method and the device, the code words with the probabilities of occurrence less than the preset threshold value are replaced by the code words at the shortest Euclidean distance from the code words with the probabilities of occurrence less than the preset threshold value, so that the use of the code words with the probabilities of occurrence less than the preset threshold value are avoided in the coding of the channel state information quantification result, a coding length is greatly shortened, the coding efficiency is improved, the coding is dynamically related with time, and the dynamic adjustability of the coding is enhanced.
Description
technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for compressing channel state information. Background technique [0002] In a MIMO (Multiple-Input Multiple-Output) system, a base station may use multiple transmit antennas to transmit data to a UE (User Equipment, user equipment), and a UE may use multiple receive antennas to receive data. Therefore, a communication channel is established between each transmitting antenna and each receiving antenna, that is, multiple communication channels are established between the base station and the UE. During communication, the UE needs to estimate the CSI (Channel State Information, Channel State Information) of the downlink channel through the reference signal, compress the estimated CSI and feed it back to the base station through the uplink channel, and the base station compresses the information according to the received CSI Adaptive launch technology can ...
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