Nonlinearity Reduction by Tone Reservation with Null Subcarriers for WiMAX System

This paper proposes an effective tone reservation method with null subcarriers (TRNS) to reduce the peak to average power ratio (PAPR) for so-called WiMAX system. The TRNS method utilizes a part of null subcarriers in guard band to reduce the PAPR, which satisfies the spectrum mask regulation and avoids bandwidth sacrifice. Furthermore, this paper analyzes the properties of order statistics of orthogonal frequency division multiplexing (OFDM) signals. A type of low complexity TRNS method (LC-TRNS) is proposed to solve problems of the TRNS method, including high complexity and the performance degradation under low predefined threshold. Finally, a joint nonlinearity reduction scheme by predistortion and TRNS method is proposed. Not only the nonlinear distortion in the WiMAX system is reduced, but also the good tradeoff between power efficiency and system performance is achieved. Both analytical and simulation results demonstrate that those proposed methods are effective in terms of spectrum mask regulation, total degradation, complementary cumulative probability function versus PAPR threshold, and bit error rate in presence of nonlinear distortion.

[1]  J. Tellado,et al.  Multicarrier Modulation with Low Par: Applications to DSL and Wireless , 2000 .

[2]  Heung-Gyoon Ryu,et al.  Threshold IBO of HPA in the predistorted OFDM communication system , 2004, IEEE Trans. Broadcast..

[3]  Gang Wu,et al.  Effectiveness of tone-reservation using null subcarriers (TR-NS) in WiMAX systems , 2007, 2007 International Conference on Communications, Circuits and Systems.

[4]  Todor Cooklev,et al.  Air Interface for Fixed Broadband Wireless Access Systems , 2004 .

[5]  Ramjee Prasad,et al.  OFDM for Wireless Multimedia Communications , 1999 .

[6]  Gang Wu,et al.  HPA Nonlinearity Reduction by Joint Predistorter and Tone-Reservation with Null Subcarriers in WiMAX Systems , 2008, 2008 4th IEEE International Conference on Circuits and Systems for Communications.

[7]  Abu B. Sesay,et al.  Adaptive asymmetric linearization of radio over fiber links for wireless access , 2002, IEEE Trans. Veh. Technol..

[8]  Meng Wang,et al.  OFDMA Uplink PAR Reduction via Tone Reservation , 2007, IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference.

[9]  Heung-Gyoon Ryu,et al.  Improvement of power efficiency of HPA by the PAPR reduction and predistortion , 2004, IEEE Transactions on Consumer Electronics.

[10]  Barry G. Evans,et al.  A Gradient Based Algorithm for PAPR Reduction of OFDM using Tone Reservation Technique , 2008, VTC Spring 2008 - IEEE Vehicular Technology Conference.

[11]  Meng Wang,et al.  A complex-baseband active-set approach for tone reservation PAR reduction in OFDM systems , 2008, 2008 Australian Communications Theory Workshop.

[12]  Su Hu,et al.  Analysis of Tone Reservation Method for WiMAX System , 2006, 2006 International Symposium on Communications and Information Technologies.

[13]  Anding Zhu,et al.  Gaussian Pulse Based Tone Reservation for Reducing PAPR of OFDM Signals , 2007, 2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring.

[14]  Davide Dardari,et al.  Analytical Evaluation of Total Degradation in OFDM Systems with TWTA or SSPA , 2002 .

[15]  Jae Hong Lee,et al.  An overview of peak-to-average power ratio reduction techniques for multicarrier transmission , 2005, IEEE Wireless Communications.

[16]  X. Fernando,et al.  Adaptive Performance Improvement of OFDM Radio over Fiber Systems , 2007, 2007 International Symposium on Signals, Systems and Electronics.

[17]  F. Raab,et al.  Power amplifiers and transmitters for RF and microwave , 2002 .

[18]  R. Reiss.  Approximate Distributions of Order Statistics , 1989 .

[19]  Su Hu,et al.  Development and performance evaluation of mobile WiMAX testbed , 2007, 2007 IEEE Mobile WiMAX Symposium.

[20]  Ieee Microwave Theory,et al.  Part 16: Air Interface for Fixed and Mobile Broadband Wireless Access Systems — Amendment for Physical and Medium Access Control Layers for Combined Fixed and Mobile Operation in Licensed Bands , 2003 .

[21]  Huey-Ru Chuang,et al.  Effects of RF-circuit nonlinear distortion on digitally modulated signals in wireless communications , 2000 .

[22]  B. Krongold.  Tone Selection for PAR Reduction via Tone Reservation in Uplink OFDMA , 2007, 2007 Conference Record of the Forty-First Asilomar Conference on Signals, Systems and Computers.

[23]  Chintha Tellambura,et al.  Analysis of Clipping Noise and Tone-Reservation Algorithms for Peak Reduction in OFDM Systems , 2008, IEEE Transactions on Vehicular Technology.

[24]  Jose Tellado-Mourelo,et al.  Peak to average power reduction for multicarrier modulation , 1999 .

[25]  A. Gatherer,et al.  Controlling clipping probability in DMT transmission , 1997, Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136).