【应用手册】24K FFT for 3GPP LTE RACH Detection In 3GPP Long Term Evolution (LTE), the user equipment (UE) transmits a random access channel (RACH) on the uplink to gain access to the network. One method to extract this UE RACH signal at the basestation is to perform a 24K FFT on the received data, allowing the desired bands to be extracted in the frequency domain. This reference design demonstrates that you can perform large FFT transforms on Altera FPGAs. This application note describes how a 24K point transform may be decomposed into three 8,192 point transforms and then implemented efficiently using a multiple channel FFT architecture. 24K FFT for 3GPP LTE RACH Detection November 2008, version 1.0 Application Note 515 Introduction In 3GPP Long Term Evolution (LTE), the user equipment (UE) transmits a random access channel (RACH) on the uplink to gain access to the network. One method to extract this UE RACH signal at the basestation is to perform a 24K FFT on the received data, allowing the desired bands ……