The week's pick
Reseach Article
A Novel Approach for Reduction in CFO at Channel Estimator in WiMax OFDM System
| International Journal of Computer Applications |
| Foundation of Computer Science (FCS), NY, USA |
| Volume 52 - Number 5 |
| Year of Publication: 2012 |
| Authors: Minal Saxena, Kavita Khare |
10.5120/8195-1579
|
Minal Saxena, Kavita Khare . A Novel Approach for Reduction in CFO at Channel Estimator in WiMax OFDM System. International Journal of Computer Applications. 52, 5 ( August 2012), 1-3. DOI=10.5120/8195-1579
Abstract
During Multicarrier transmission in OFDM(Orthogonal Frequency Division Multiplexing), the signal suffers due to fading environment and results in timing and frequency errors at the receiver end. An efficient timing and frequency offset estimation algorithm has been designed in VHDL using ISE XILINX 10. 1. The maximum value at which the timing offset is achieved and input signal with a delay are compared to get the frequency offset. This operation ensures that the frequency offset calculation is done at the best time, i. e. , when the correlation over the actual received symbol cyclic prefix is complete. The values for frequency offset has been obtained after simulations as . 00034232 and timing offset has been observed as1. 864ns. The design is achieved at 75. 5 Mhz and uses 2% of the total memory of the Virtex-6 Device. The design when implemented was found to reduce 95% of carrier frequency offset(CFO) error, than the performance of a simple frequency estimator.
References
- M. Luise, M. Marselli, and R. Reggiannini, "Low complexity blind carrier frequency recovery for OFDM signals over frequency-selective radio channels," IEEE Trans. Comm. , vol. 50, 2002, pp. 1182-1188.
- "OFDM Transceiver Reference Design", Lattice Semiconductor OFDM Transceiver design package, 2005.
- T. Roman, S. Visuri, and V. Koivunen, "Blind frequency synchronization in OFDM via diagonality criterion," IEEE Trans. Signal Process. , vol. 54, 2006, pp. 3125-3135.
- Malihe Ahmadi ,Aryan Saadat Mehr ,"Superimposed training aided Carrier Frequency Offset Estimation in OFDM systems", Proceedings Pgs296-299 IEEE EIT 2007.
- "OFDM Transceiver Reference Design", Lattice Semiconductor OFDM Transceiver design package, 2005
- . "Implementation of an OFDM Wireless Transceiver using IP Cores on an FPGA", Lattice Semiconductor white paper, 2005.
- J J van de beek ,M Sandell, M. Isaksson and P. Borjesson,"Low complex frame synchronization in OFDM systems",in Proceedings of( ICUPC),1995,pp. 982-986.
- Lin Lin ,Yan-feng Qiao,Wan-xin Su,"OFDM Baseband Modulation Technology based on VHDL"in Proceedings of the IEEE. 2010
Index Terms
Keywords