Channel-dependent mc-cdma utilizing adaptive spreading codes aided physical layer security

An operation method of Channel-Dependent MC-CDMA with Adaptive Spreading Codes Aided Physical Layer Security, comprising the steps of;

• Adaptive interval map design process;
• Starting from first window, distinguish the legitimate receivers (UEs)' channel gains with K different quantization levels,
• Defining of the UEs' channel gains in the window as H={HUE1, HUE2, . . . , HUEK},
• Sorting of the UEs' channel gains in a descending manner, as follows:
• HUE1≤HUE2≤ . . . ≤HUEK,
• Initiating of channel gain ranges as:
• [
• min
• ⁡
• (
• H
• )
• ,
• H
• UE
• 1
• +
• H
• UE
• 2
• 2
• ,
• …
• ,
• H
• UE
• K
• -
• 1
• +
• H
• UE
• K
• 2
• ,
• max
• ⁡
• (
• H
• )
• ]
• where min(H) and max(H) denote the maximum and minimum channel gain in this window,
• Moving to the next windows for increasing of the quantization levels only to keep the UEs' channel gains per window distinguishable,
• Defining the code length as M=2┌log2(AQL)┐, where AQL is the total number of quantization levels with adaptive interval,
• Generating of the codebook, CM×M, where all codes are orthogonal,
• Generating of the shared map as a quantization levels vs orthogonal codes, where i-th spreading code sequence assigned to i-th quantization level,
• After map design process, passing signal process for decoding,
• Completion of signal process for decoding.