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