| CPC H04B 7/0456 (2013.01) [H04B 7/0452 (2013.01)] | 26 Claims | 

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               1. An apparatus, comprising: 
            a first circuit; and 
                a second circuit; 
                wherein the first circuit is configured to determine channel state information, wherein the channel state information is determined based on S indexes of S vectors, each of the S vectors includes in a first vector quantization dictionary, the first vector quantization dictionary includes N1 vectors, and N1 and S are both positive integers greater than 1; and 
                send, through the second circuit, the channel state information to a network device; 
                wherein the S vectors are determined based on S pieces of first channel information and the first vector quantization dictionary, and the S pieces of first channel information are information output by an encoder network for an input being one channel matrix. 
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