Abstract
High Peak to Average Power Ratio (PAPR) is one of the major drawbacks in the Orthogonal Frequency Division Multiple Access (OFDMA) systems. In this paper, we present a novel Zadoff-Chu Matrix Transform (ZCMT) precoding based Interleaved-OFDMA uplink system with improved PAPR for the upcoming 4G cellular systems. The proposed system is based on the precoding of constellation symbols with ZCMT precoder in such a way that the system becomes Constant Envelope OFDMA (CE-OFDMA). The CE-OFDMA signal allows the Radio-Frequency (RF) high power amplifier to operate near its saturation levels, thus maximize the power efficiency. However, even 0 db PAPR or CE-OFDMA systems must contend with pulse shaping to keep out of band radiation low and to meet the transmission spectrum mask requirement. Hence, the PAPR is analyzed with Root Raised Cosine pulse shaping. Simulation results show that proposed system has better PAPR gain than the walsh-hadamard transform (WHT) precoded Interleaved-OFDMA uplink systems and the conventional Interleaved-OFDMA uplink systems.
Original language | English |
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Pages (from-to) | 557-562 |
Number of pages | 6 |
Journal | IETE Journal of Research |
Volume | 57 |
Issue number | 6 |
DOIs | |
Publication status | Published - Nov 2011 |
Externally published | Yes |
Keywords
- Interleaved-orthogonal frequency division multiple access uplink
- Orthogonal frequency division multiple access
- Peak to average power ratio
- Zadoff-chu matrix transform