function search_flag group_No timeslot_Norx_data = CDMA_RxFrameSyninput_data sample_rate timeslot_star 变量初始化 Allocation of SSCs for secondary SCH

The code provided is a MATLAB function named CDMA_RxFrameSyn. This function is used to perform frame synchronization in a CDMA (Code Division Multiple Access) system.

The input parameters for the function are:

• input_data: The received data from the CDMA system.
• sample_rate: The sample rate of the received data.
• timeslot_star: The starting timeslot number for synchronization.

The output parameters for the function are:

• search_flag: A flag indicating whether frame synchronization was successful (1) or not (0).
• group_No: The group number of the synchronized frame.
• timeslot_No: The timeslot number of the synchronized frame.
• rx_data: The synchronized frame data.

The function performs the following steps:

1. Initializes variables and constants.
2. Generates the secondary synchronization codes (SSC) using Hadamard sequences.
3. Calculates the correlation between the received data and the SSC to determine the SSC number.
4. Determines the group number and the timeslot number of the synchronized frame based on the SSC number.
5. If synchronization is successful, extracts the synchronized frame data from the received data.
6. Returns the output parameters.

Note: The function includes some incomplete parts marked with "%%%%%%%%%%%%%% student code %%%%%%%%%%%%%%%%%%%%%%%". You will need to complete these parts according to the desired functionality