Abstract
Dramatic growth rates in capacity demands in wireless and other broadband systems have resulted in a rise in the use of communication networks in which multiple users share common communication resources. A significant consequence of this trend is the increasing presence of multiple-access interference (MAI), which arises in communication systems employing non-orthogonal multiplexing, that is, in multiple-access systems. This issue arises naturally, for example, in code-division multiple-access (CDMA) communication systems using nonorthogonal spreading codes. It also arises in orthogonally multiplexed wireless channels, such as time-division multiple-access (TDMA) and orthogonal frequency division multiple-access (OFDMA) channels, due to effects such as multipath or nonideal frequency channelization, and in wireline channels such as those arising in digital subscriber line (DSL) systems or powerline communications (PLCs) in which crosstalk and other types of interference are major impairments. MAI also arises in optical wave-division multiplexing (WDM) systems due to mode interactions caused by nonlinearities.
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Notes
- 1.
The relationship between p, q and (k, i), (ℓ, j) is
$$k = {[p - 1]}_{K},\ i = \left \lfloor \frac{p - 1} {K} \right \rfloor,\ \mathcal{l} = {[q - 1]}_{K},\ \ \mathrm{and}\ \ j = \left \lfloor \frac{q - 1} {K} \right \rfloor,$$(12.9)where [ ⋅]K denotes reduction modulo K. 
- 2.
The dynamic programming solutions arising in both the classical and semiclassical models are both special cases of a more general dynamic programming model developed in [25].
- 3.
Detection when the states defining the various hypotheses are uncertain is treated in [9].
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Acknowledgments
This work was prepared under the support of the National Science Foundation under Grant CNS-09-05398.
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Poor, H.V. (2012). Multiple-Access Interference. In: Cohen, L., Poor, H., Scully, M. (eds) Classical, Semi-classical and Quantum Noise. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-6624-7_12
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