US 12,250,066 B2
Channel-dependent MC-CDMA utilizing adaptive spreading codes aided physical layer security
Hüseyin Arslan, Istanbul (TR); Sanaz Naderi, Istanbul (TR); and Hanadi Mohammad Yousef Salman, Istanbul (TR)
Appl. No. 18/249,323
Filed by ISTANBUL MEDIPOL UNIVERSITESI, Istanbul (TR)
PCT Filed Oct. 1, 2021, PCT No. PCT/TR2021/051002
§ 371(c)(1), (2) Date Apr. 17, 2023,
PCT Pub. No. WO2022/086468, PCT Pub. Date Apr. 28, 2022.
Claims priority of application No. 2020-16639 (TR), filed on Oct. 19, 2020.
Prior Publication US 2023/0403094 A1, Dec. 14, 2023
Int. Cl. H04J 13/00 (2011.01); H04B 1/692 (2011.01); H04B 1/7097 (2011.01); H04J 13/12 (2011.01)
CPC H04J 13/0077 (2013.01) [H04B 1/692 (2013.01); H04B 1/7097 (2013.01); H04J 13/12 (2013.01); H04J 2013/0081 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A method of operating Channel-Dependent multi-carrier code-division multiple access (Mc-CDMA) with Adaptive Spreading Codes Aided Physical Layer Security, the method comprising:
distinguishing legitimate receivers (UEs') channel gains with different quantization levels, the step of distinguishing being in a first window:
defining the UEs' channel gains in the first window as H={HUE1, HUE2, . . . , HUEK};
sorting the UEs' channel gains in a descending manner as HUE1≤HUE2≤ . . . HUEK;
initiating channel gain range as

OG Complex Work Unit Math
 where the min (H) and the max (H) denote a minimum channel gain and a maximum channel gain in the first window;
moving to a next window to increase quantization so as to keep the UEs' channel gains distinguishable in the next window;
defining a code length as M=2┌log2(AQL)┐ in which an acceptable quality limit (AQL) is a total number of quantization levels with respective adaptive intervals;
generating a codebook (CM×M) in which codes therein are orthogonal;
generating a shared map of quantization levels versus orthogonal codes in which a spreading code sequence is assigned to an quantization level;
passing a signal process for decoding after generating the shared map;
completing the passed signal process for decoding.