Overloading the Capacity of Multiple Access Channel

Abstract

Limited availability of spectrum has always motivated the researchers to focus on various multiple access coding and decoding techniques. Such techniques not only help in having more users but also assist in error control. The complementary weight based coding (CWC) effectively allows the same medium or channel to be shared by more than one user without any further subdivision in time, frequency or orthogonal codes in order to have orthogonality. The coding and decoding is based on assigning separate predefined weights to different users so as to have a distinction in their respective transmitted symbols. A simple multi level threshold logic detector (TLD) with hard decision (HD) logic is used for decoding purpose. The effectiveness of the proposed technique is tested in the presence of AWGN channel condition.