Abstract
The information-theoretic sum capacity of reverse link CDMA systems with QoS constraints is investigated in this paper. Since the reverse link of CDMA systems are, for a given channel and noise conditions, interference-limited, the sum capacity can be achieved by optimally allocating the transmit powers of the mobile stations with the optimal (Shannon) coding. Unfortunately, the sum capacity is usually achieved via unfair resource allocation. This can be avoided by imposing QoS constraints on the system. The results here show that for a single cell system, the sum capacity can be achieved while meeting the QoS constraints with a semi-bang-bang power allocation strategy. Numerical results are then presented to show the multi-user diversity gain and the impact of QoS constraints. The implication of TDM operation in a practical reverse link CDMA system is also discussed.
Original language | English |
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Pages (from-to) | 3-7 |
Number of pages | 5 |
Journal | IEEE Transactions on Wireless Communications |
Volume | 5 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2006 Jan |
Externally published | Yes |
Keywords
- Capacity
- Code Division Multiple Access (CDMA)
- Power control
- Resource allocation
ASJC Scopus subject areas
- Computer Science Applications
- Electrical and Electronic Engineering
- Applied Mathematics