Over multipath channels, complete complementary code division multiple access and convolutional spreading provide inter-channel interference free transmission with an enhanced spectral efficiency. However, the convolutional spreading (CS) operation of systems is computationally complex involves...

Gain division multiple access (GDMA) is a non-orthogonal (NOMA) technique for uplink communications. In GDMA, the receiver employs both magnitudes and phases of channel gains associated to users separate users. power-domain NOMA, power levels users.We apply GDMA concept together with orthogonal frequency (OFDM) combat collision problem in ALOHA system. Our goal minimize complexity devices (user...