Title :
A New Study on the Power Distribution of OFDMA, SC-FDMA and CP-CDMA Signals
Author :
Varghese, George ; Zheng, F.-C.
Author_Institution :
Sch. of Syst. Eng., Univ. of Reading, Reading, UK
Abstract :
This paper explores a new technique to calculate and plot the distribution of instantaneous transmit envelope power of OFDMA and SC-FDMA signals from the equation of Probability Density Function (PDF) solved numerically. The Complementary Cumulative Distribution Function (CCDF) of Instantaneous Power to Average Power Ratio (IPAPR) is computed from the structure of the transmit system matrix. This helps intuitively understand the distribution of output signal power if the structure of the transmit system matrix and the constellation used are known. The distribution obtained for OFDMA signal matches complex normal distribution. The results indicate why the CCDF of IPAPR in case of SC-FDMA is better than OFDMA for a given constellation. Finally, with this method it is shown again that cyclic prefixed DS-CDMA system is one case with optimum IPAPR. The insight that this technique provides may be useful in designing area optimised digital and power efficient analogue modules.
Keywords :
OFDM modulation; code division multiple access; frequency division multiple access; probability; CP-CDMA signal; OFDMA signal; SC-FDMA signal; complementary cumulative distribution function; instantaneous power to average power ratio; power distribution; probability density function; Distribution functions; Frequency conversion; Multiaccess communication; OFDM; Peak to average power ratio; Power amplifiers; Power distribution; Power generation; Signal analysis; Thermal management;
Conference_Titel :
Vehicular Technology Conference (VTC 2010-Spring), 2010 IEEE 71st
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-2518-1
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2010.5493926