Lte cfi decoding. The standard method of CFI detection involves the use of the The size of the control region (i. This paper studies control format indicator (CFI) estimation methods in 4G-LTE communication systems. CFI is a indicator telling how many OFDM symbols are used for carrying control channel (e. In each subframe, several DCIs can be transmitted at a time. The exact position of PCFICH is determined by cell ID and bandwidth. . For example, let's look into all the possible combinations to try for Common Search Space and assume the total space is 16 CCEs. PCFICH data is carried by 4 REGs and these four REGs are evenly distributed across the whole band regardless of the bandwidth. g, PDCCH and PHICH) at each subframe. CFI is an essential control signal in LTE, and must be correctly detected at the receiver to avoid degraded system performance. Following is factors and number of combinations. e. CFI is a indicator telling how many OFDM symbols are used for carrying control channel (e. , 1, 2, or 3 symbols) is given by the CFI (control format indicator) carried in the PCFICH of each subframe. With the information obtained from the MIB the UE can now decode the control format indicator (CFI), which indicates the physical downlink control channel (PDCCH) length. This allows the PDCCH to be decoded, and searched This is called 'Blind Decoding'. The steps to process PCFICH (Converting CFI into physical symbols) is illustrated as follows. If CFI is set to be 1 for a subframe, it means one symbol (the first symbol) at the subframe is used for PDCCH allocation. i) All the possible blocks assuming Aggregation Level 4 = 16 (CCE) / 4 (Aggregation Level) = 4 blocks. ndfuxfmenwiwgbvjnmqbuiulnnkmgtapdwlglruypihijxgkmh
