An Interpretation of Channel Overloading and Construction of Some Novel Schemes
نویسنده
چکیده
Channel overloading, which refers to accommodating a larger number of users on a channel than can be achieved with orthogonal signaling, is currently a very hot topic for future wireless systems. A number of approaches have been described in the literature, and the most efficient of them use several sets of orthogonal signal waveforms. Multiuser interference, which is inherent to channel overloading, is handled using maximum-likelihood detection or iterative interference cancellation. In this paper, channel overloading is interpreted as multilevel coding of an expanded signal constellation. This interpretation gives further insight into the performance and limitations of existing channel overloading techniques and allows us to construct some novel schemes.
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