Title :
OFDM Symbol Design for Peak-to-Average Power Ratio Reduction Employing Non-Data Bearing Subcarriers
Author :
Rajbanshi, Rakesh ; Wyglinski, Alexander M. ; Minden, Gary J.
Author_Institution :
Cisco Syst., Inc., San Jose
fDate :
March 31 2008-April 3 2008
Abstract :
In this paper, we present a novel peak-to-average power ratio (PAPR) reduction algorithm for OFDM systems employing a symbol balancing approach with several non-data bearing (NDB) subcarriers. The proposed algorithm assigns the NDB subcarriers values that, when combined with interleaving, reduces the long correlation patterns of the input frame that can potentially lead to high PAPR. Furthermore, the proposed algorithm can use either a fixed number of NDB subcarriers or a variable number of NDB subcarriers according to the amount of inter-subcarrier correlation, thus attempting to increase the data throughput of the system. Simulation results for a 256-subcarrier OFDM system employing QPSK symbols and 16 interleavers can achieve a PAPR reduction of 4 dB for a complementary cumulative distribution of 0.01%.
Keywords :
correlation methods; frequency division multiplexing; subcarrier multiplexing; OFDM symbol design; OFDM systems; correlation patterns; intersubcarrier correlation; nondata bearing subcarriers; peak-to-average power ratio reduction; Application software; Communications Society; Computational complexity; Information technology; Interleaved codes; OFDM; Partial transmit sequences; Peak to average power ratio; Throughput; USA Councils;
Conference_Titel :
Wireless Communications and Networking Conference, 2008. WCNC 2008. IEEE
Conference_Location :
Las Vegas, NV
Print_ISBN :
978-1-4244-1997-5
DOI :
10.1109/WCNC.2008.103