PAPR Analytical Characterization and Reduced-PAPR Code Allocation Strategy for MC-CDMA Transmissions

• Published in: IEEE transactions on wireless communications Vol. 10; no. 1; pp. 219 - 227
• Main Authors: Giannetti, F, Lottici, V, Stupia, I
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-01-2011; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Arrays; code division multiplexing; Coding, codes; Complexity theory; Exact sciences and technology; Information, signal and communications theory; Measurement; Multicarrier code division multiple access; Multiplexing; nonlinear distortion; Peak to average power ratio; Resource management; Signal and communications theory; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Transmission and modulation (techniques and equipments); Transmitters; Code division multiplexing; Occurrence frequency; Wireless telecommunication; Multicarrier; Peak to average power ratio; Implementation; nonlinear distortion; Code division multiple access; Analytical method; Robustness; multicarrier code division multiple access; Hadamard codes; Signal distortion
• ISSN: 1536-1276; 1558-2248
• DOI: 10.1109/TWC.2010.112310.100280

In this paper, an approximate analytical expression for the peak-to-average power ratio (PAPR) of a Multi-Carrier Code Division Multiple Access (MC-CDMA) signal is derived. Then, it is demonstrated that the PAPR of a MC-CDMA system employing Walsh-Hadamard (WH) codes can be suitably reduced by resorting to a judicious strategy for the allocation of the spreading signature codes. Eventually, a low-complexity implementation of the proposed strategy is presented and the relevant benefits, in terms of peak signal occurrence and robustness against nonlinear distortions, is numerically assessed over conventional random allocation strategy.