Research Article Open Access

On-Chip Implementation of High Resolution High Speed Floating Point Adder/Subtractor with Reducing Mean Latency for OFDM

Rozita Teymourzadeh1, Yazan Samir Algnabi2, Nooshin Mahdavi1 and Masuri Bin Othman2
  • 1 ,
  • 2 , Afganistan
American Journal of Engineering and Applied Sciences
Volume 3 No. 1, 2010, 25-30

DOI: https://doi.org/10.3844/ajeassp.2010.25.30

Submitted On: 12 September 2009 Published On: 31 March 2010

How to Cite: Teymourzadeh, R., Algnabi, Y. S., Mahdavi, N. & Othman, M. B. (2010). On-Chip Implementation of High Resolution High Speed Floating Point Adder/Subtractor with Reducing Mean Latency for OFDM. American Journal of Engineering and Applied Sciences, 3(1), 25-30. https://doi.org/10.3844/ajeassp.2010.25.30

Abstract

Problem statement: Fast Fourier Transform (FFT) is widely applied in OFDM trance-receiver communications system. Hence efficient FFT algorithm is always considered. Approach: This study proposed FPGA realization of high resolution high speed low latency floating point adder/subtractor for FFT in OFDM trance-receiver. The design was implemented for 32 bit pipelined adder/subtractor which satisfied IEEE-754 standard for floating-point arithmetic. The design was focused on the trade-off between the latency and speed improvement as well as resolution and silicon area for the chip implementation. In order to reduce the critical path and decrease the latency, the novel structure was designed and investigated. Results: Consequently, synthesis report indicated the latency of 4 clock cycles due to each stage operated within just one clock cycle. The unique structure of designed adder well thought out resulted 6691 equivalent gate count and lead us to obtain low area on chip. Conclusion: The synthesis Xilinx ISE software provided results representing the estimated area and delay for design when it is pipelined to various depths. The report showed the minimum delay of 3.592 ns or maximum frequency of 278.42 MHz.

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Keywords

  • OFDM
  • FFT
  • FPGA
  • Synopsys design compiler
  • CMOS layout