Joint Codeword and Power Adaptation for CDMA Systems with Multipath and QoS Requirements

In this paper we present an algorithm for joint codeword and power adaptation applicable in the uplink of a Code Division Multiple Access (CDMA) system in which multipath channels between users and the base station receiver are explicitly considered. The proposed algorithm uses incremental updates for codeword and power that allow a smooth transition of the system to a steady state configuration where specified targets for the signal-to-interference+noise-ratio (SINR) are achieved with minimum powers. The algorithm is illustrated with numerical results obtained from simulations.

[1]  Roy D. Yates,et al.  Iterative construction of optimum signature sequence sets in synchronous CDMA systems , 2001, IEEE Trans. Inf. Theory.

[2]  Christopher Rose,et al.  Codeword optimization for uplink CDMA dispersive channels , 2005, IEEE Transactions on Wireless Communications.

[3]  S. Ulukus,et al.  Optimization of CDMA signature sequences in multipath channels , 2001, IEEE VTS 53rd Vehicular Technology Conference, Spring 2001. Proceedings (Cat. No.01CH37202).

[4]  Robert W. Heath,et al.  What is the value of limited feedback for MIMO channels? , 2004, IEEE Communications Magazine.

[5]  Christopher Rose,et al.  Codeword quantization for interference avoidance , 2000, 2000 IEEE International Conference on Acoustics, Speech, and Signal Processing. Proceedings (Cat. No.00CH37100).

[6]  D.C. Popescu,et al.  Adaptive Interference Avoidance for Dynamic Wireless Systems: A Game Theoretic Approach , 2007, IEEE Journal of Selected Topics in Signal Processing.

[7]  D.C. Popescu,et al.  Gradient Descent Interference Avoidance for Uplink CDMA Systems with Multipath , 2007, 2007 Conference Record of the Forty-First Asilomar Conference on Signals, Systems and Computers.

[8]  David Tse,et al.  Optimal sequences, power control, and user capacity of synchronous CDMA systems with linear MMSE multiuser receivers , 1999, IEEE Trans. Inf. Theory.

[9]  Michael L. Honig,et al.  Signature optimization for CDMA with limited feedback , 2005, IEEE Transactions on Information Theory.

[10]  Tommy Guess.  Optimal sequences for CDMA with decision-feedback receivers , 2003, IEEE Trans. Inf. Theory.

[11]  Ha H. Nguyen.  Optimization of Signature Waveforms and Power Allocation for Synchronous CDMA Systems under RMS Bandwidth Constraint , 2003 .

[12]  Anna Scaglione,et al.  Design of user codes in QS-CDMA systems for MUI elimination in unknown multipath , 1999, IEEE Communications Letters.

[13]  Kenneth W. Shum,et al.  Stability of distributed power and signature sequence control for CDMA Systems-a game-theoretic framework , 2006, IEEE Transactions on Information Theory.

[14]  Christopher Rose,et al.  Interference Avoidance Methods for Wireless Systems , 2004 .

[15]  Robert W. Heath,et al.  Finite-step algorithms for constructing optimal CDMA signature sequences , 2004, IEEE Transactions on Information Theory.

[16]  Michael L. Honig,et al.  Power and signature optimization for downlink CDMA , 2002, 2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333).

[17]  R. Michael Buehrer.  Code Division Multiple Access (CDMA) , 2006, Code Division Multiple Access.

[18]  Pramod Viswanath,et al.  Optimal sequences, power control and capacity of spread spectrum systems with multiuser linear recei , 1968 .

[19]  D.C. Popescu,et al.  Interference Avoidance With Limited Feedback , 2007, 2007 Conference Record of the Forty-First Asilomar Conference on Signals, Systems and Computers.

[20]  Roy D. Yates,et al.  Wireless systems and interference avoidance , 2002, IEEE Trans. Wirel. Commun..

[21]  Michael L. Honig,et al.  Signature sequence adaptation for DS-CDMA with multipath , 2002, IEEE J. Sel. Areas Commun..

[22]  Don Torrieri,et al.  Principles of Spread-Spectrum Communication Systems , 2004 .

[23]  Dimitris A. Pados,et al.  New bounds on the total squared correlation and optimum design of DS-CDMA binary signature sets , 2003, IEEE Trans. Commun..