Abstract
An interference-limited noise-free CDMA downlink channel operating under a complexity constraint on the receiver is introduced. According to this paradigm, detected bits, obtained by performing hard decisions directly on the channel's matched filter output, must be the same as the transmitted binary inputs. This channel setting, allowing the use of the simplest receiver scheme, seems to be worthless, making reliable communication at any rate impossible. We prove, by adopting statistical mechanics notion, that in the large-system limit such a complexity-constrained CDMA channel gives rise to a non-trivial Shannon-theoretic capacity, rigorously analyzed and corroborated using finite-size channel simulations.
Original language | English |
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Pages (from-to) | 10-12 |
Number of pages | 3 |
Journal | IEEE Communications Letters |
Volume | 10 |
Issue number | 1 |
DOIs | |
State | Published - Jan 2006 |
Bibliographical note
Funding Information:Manuscript received July 12, 2005. The associate editor coordinating the review of this letter and approving it for publication was Prof. Giorgio Taricco. This research was supported by the Israel Science Foundation (Grants 1232/04, 296/03).
Funding
Manuscript received July 12, 2005. The associate editor coordinating the review of this letter and approving it for publication was Prof. Giorgio Taricco. This research was supported by the Israel Science Foundation (Grants 1232/04, 296/03).
Funders | Funder number |
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Israel Science Foundation | 1232/04, 296/03 |
Keywords
- CDMA
- Capacity
- Complexity
- Hopfield model
- Statistical mechanics