CDMA: principles of spread spectrum communication
CDMA: principles of spread spectrum communication
WCDMA for UMTS: HSPA Evolution and LTE
WCDMA for UMTS: HSPA Evolution and LTE
Brief paper: Architectures and coder design for networked control systems
Automatica (Journal of IFAC)
Quantization Noise: Roundoff Error in Digital Computation, Signal Processing, Control, and Communications
Adaptive power control of cellular CDMA systems via the optimal predictive model
IEEE Transactions on Wireless Communications
Dynamical effects of time delays and time delay compensation in power controlled DS-CDMA
IEEE Journal on Selected Areas in Communications
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The successful operation of CDMA systems depend on the use of power control. This is needed to address the "near far" effect and to mitigate the effects of fading. Other factors also impact on the achievable performance of the power control loop including the fact that only the sign of the power increments are transmitted. The paper presents new methods and results to improve control with respect to the latter strongly non-linear effect. An adaptive control architecture, having three degrees of freedom, is therefore proposed for inner loop power control. The three degrees of freedom are used to address errors resulting from (i) channel and interference variations, (ii) quantization of the power increments and (iii) saturation of the power increments. Simulations show that the proposed controller outperforms other related schemes. A major reason for this is the ability of the three degree of freedom controller to reduce the variation of the control signal to be quantized.