Method and system for producing LTE PRACH (Long Term Evolution Physical Random Access Channel) baseband signal

Method and system for producing LTE PRACH (Long Term Evolution Physical Random Access Channel) baseband signal

The invention discloses a method and a system for producing an LTE PRACH (Long Term Evolution Physical Random Access Channel) baseband signal. The method comprises the following steps of: (1) calculating parameters required by the production of the LTE PRACH baseband signal according to the provisions of the LTE protocol; (2) calculating phase values of a DFT (Discrete Forurier Transform) sequence of a leader sequence, writing the phase values into a frequency domain phase buffer memory in sequence, and executing the step (3) after writing ZNC phase values; (3) configuring IFFT (Inverse Fast Fourier Transform) operation not containing an inverse order to be NIFFT (Non Inverse Fast Fourier Transform) in length and a groups and performing a times IFFT (Inverse Fast Fourier Transform) operation of an NIFFT (Non Inverse Fast Fourier Transform) point; and (4) reading data from a baseband signal buffer memory, sending circulation prefixes and entire sequence part, and clearing the frequency domain ...

Method and device for detecting duplex mode of LTE system

The invention provides a method and a device for detecting the duplex mode of an LTE system. The method comprises the following steps that: a down-sampler down-samples a baseband digital signal; a time delay normalization autocorrelator performs time delay normalization and autocorrelation on the down-sampled baseband digital signal; and a duplex mode detector detects the duplex mode of the LTE system according to the peak characteristic of the time delay normalization and autocorrelation of the down-sampled baseband digital signal. By applying the method and the device, the duplex mode can be quickly and accurately detected through simple operation based on the characteristic of a frame structure of LTE standard.