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- Title
Optimal power allocation in DS-CDMA with adaptive SIC technique.
- Authors
Maity, Santi; Hati, Sumanta; Maji, Chinmay
- Abstract
This paper proposes an optimal power allocation in direct sequence-code division multiple access (DS-CDMA) system. The objective is to minimize total transmit power, while simultaneously meeting the certain sum channel capacity (data transmission rate) and outage probability constraints on Rayleigh fading channel. Then a weighted correlator with an adaptive successive interference cancelation (SIC) scheme is developed using neural network (NN) for an improvement in receiver performance. A closed mathematical form of joint probability of error (JPOE) is derived. This determines the number of active users' interfering effect that needs to be canceled in order to achieve a desired bit error rate (BER) value. Mathematical analysis shows that better receiver performance can be achieved through large change in weight up-gradation ( w) for the strong users with a particular change in learning rate ( η). Simulation results in terms of sum capacity as well as weak user's (users with poor channel gain) capacity, outage probability and BER performance duly support the effectiveness of the proposed scheme over the existing works.
- Subjects
CHANNEL capacity (Telecommunications); WIRELESS communications; BINARY erasure channels (Telecommunications); CHANNEL spacing (Telecommunication); MATHEMATICAL analysis
- Publication
Telecommunication Systems, 2014, Vol 56, Issue 3, p335
- ISSN
1018-4864
- Publication type
Article
- DOI
10.1007/s11235-013-9847-2