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Design and Analysis of an Area Efficient and Low Power NEW-R2MDC FFT for MIMO OFDM in wireless Communication

IJCSEC Front Page
Authors:
Kirubanandasarathy.N,Ramesh.G.P
Volume
2, Issue 4
Pages:
400-406
Year of Publication:
2014
International Journal of Computer Science and Engineering Communications
ISSN:
2347–8586
Citation: Kirubanandasarathy,N.,Ramesh,G,P. (2014).Design and Analysis of an Area Efficient and Low Power NEW-R2MDC FFT for MIMO OFDM in wireless Communication. International Journal of Computer Science and Engineering Communications,Vol.2,Issue.4,pp.400-406.
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Abstract
In this paper, an area-efficient low power fast fourier transform (FFT) processor is proposed for multi input multi output -orthogonal frequency division multiplexing (MIMO-OFDM) in wireless communication system. It consists of a modified architecture of radix-2 algorithm which is described as new radix-2 multipath delay commutation (New- R2MDC). Orthogonal frequency-division multiplexing is a popular method for high data rate wireless transmission. This paper describes the very large scale integration (VLSI) design of an area efficient new-r2mdc FFT for MIMO OFDM system targeted to future wireless communication systems. The very high speed integrated hardware description language (VHDL) simulation results have been tested practically by implementing in the Altera DE-2 field programmed gate array (FPGA) development board. Also the existing OFDM system has been tested with these FFT algorithms and their performances were analyzed with respect to occupation of area in FPGA and power consumption. A low-power and area efficient architecture enables the real-time operations of MIMO OFDM system.
Keywords:New-radix-2 multipath delay commutation, frequency division multiplexing, multi input multi output – orthogonal frequency division multiplexing, inverse fast fourier transform, fast fourier transform, discrete fourier transform
I.Introduction
MIMO-OFDM is the efficient solution for transmitting and receiving the data over the long distance. The sub-carrier frequency has been chosen in our proposed MIMO OFDM transceivers so that cross-talk between the sub-channels are eliminated, hence the inter carrier guard bands are not required [1]. This greatly simplifies the design of both the transmitter and the receiver; unlike conventional frequency division multiplexing (FDM), a separate filter for each subchannel is not required [2]. The orthogonally allows for efficient modulator and demodulator implementation using the FFT algorithm [3]. OFDM transceiver is popular for wideband communications today by way of low-cost MIMO OFDM in wireless telecommunication system. It requires very accurate frequency synchronization between the receiver and they have reduced the complexity [4]. In transmitter; with frequency deviation, the sub-carriers shall no longer be orthogonal, causing inter-symbol interference (ISI) [5]. The 5/6 coding rate would be not effective for error correcting by a viterbi decoder [6]. This paper describes the VLSI implementation of the proposed new-R2MDC for MIMO OFDM systems, i.e., modified radix-2 multipath delay commutation pipeline FFT based MIMO OFDM system..
The radix-2 algorithm with multi delay commutation architecture is to support 4-channel 8, 16, 32, 64, 128, 512, 1024 and 2048-point FFT operations [7, 8]. We compare this proposed architecture with existing 8-point radix 2, radix 4 FFT and existing R2MDC FFT and also give the design and implementation results of the proposed FFT processor.

References:

  1. Jaeho Chung, Yusuk Yun, Seungwon Choi, ‘Experiments on MIMO-OFDM system combined with adaptive beamforming based on IEEE 802.16e WMAN standard.’ Telecommunication systems Journal (TSMJ), June 2011,pp: 1-14.
  2. G. Jongren, M. Skoglund, and B. Ottersten, ‘Combining beamforming and orthogonal space-time block coding.’ IEEE Transactions on Information Theory, vol. 48, no. 3, 2002, pp: 611-627.
  3. Dae Wook Byun, Young Min Ki, and Dong Ku Kim, ‘Channel state-aware joint dynamic cell coordination scheme using adaptive modulation and variable reuse factor in OFDMA down link.’ Telecommunication systems Journal (TSMJ), Vol. 36, Issue 1-3, Nov 2007, pp: 85-96.
  4. T. Aruna, and M. Suganthi,‘Variable power adaptive MIMO OFDM system under imperfect CSI for mobile adhoc networks.’ Telecommunication systems Journal (TSMJ), Vol. 50, Issue 1, April 2012, pp: 47-53.
  5. H. Bolcskei, D. Gesbert, and A.J. Paulraj, ‘On the capacity of OFDM-Based Spatial Multiplexing systems.’ IEEE Trans. Communication, vol. 50, Issue no. 2, 2002, pp: 225-234.
  6. Reza Holakouei, Adao Silva, and Atilio Gameiro, ‘Multiuser precoding techniques for a distributed broadband wireless system.’ Telecommunication systems Journal (TSMJ), June 2011.
  7. P. Coulton, and D. Carline, ‘An SDR inspired design for the FPGA implementation of 802.11a baseband system.’ Proceedings of the IEEE International Symposium on Consumer Electronics, UK. September 2004, pp: 470-475.
  8. C. Dick, and F. Harris, ‘FPGA implementation of an OFDM PHY.’ Proceedings of the Conference Record of the 37th Asilomar Conference on Signals, Systems and Computers, vol. 1, Pacific Grove, CA., USA., Nov 2003, pp: 905-909.
  9. S.M. Alamouti, ‘A Simple Transmit Diversity Technique for Wireless Communications.’ IEEE Journal on select areas in communications, Vol. 16, Issue no.8, 1998, pp: 1451-145.
  10. N. Kirubanandasarathy, K. Karthikeyan, and K. Thirunadanasikamani, ‘VLSI Design of Mixed Radix FFT for MIMO OFDM In the wireless communication.’ Proceedings of the IEEE International conference on communication computing control technologies, Ramanathapuram, India, Oct 2010, pp: 98-102.
  11. R.S. Blum, Y.G. Li, J.H. Winters, and Q. Yan, ‘Improved space time coding for MIMO-OFDM wireless communications.’ IEEE Trans. Communications, vol. 49, Issue no. 11, 2001, pp: 1873-1878.
  12. Guilleum Femenias and Felip Riera-Palou, ‘Enhancing IEEE 802.11n WLANs using group-orthogonal codedivision multiplex’ Telecommunication systems Journal (TSMJ), 2008, Vol. 38, Issue 1-2, June 2008, pp: 37-44.
  13. M. Arioua, S. Belkouch, M. Agdad, and M.M. Hassani, ‘VHDL implementation of an optimized 8-point FFT/IFFT processor in pipeline architecture for OFDM systems.’ Proceedings of the IEEE International conference on Multimedia computing and system (ICMCS), 2011, pp: 1-5.
  14. J. Becker, ‘Configurable Systems-on-Chip.’ Proceedings of the 15th Symposium on Integrated Circuits and Systems Design, (SICSD’2002), Karlsruhe University, Germany, 2002, pp: 379 – 384.
  15. W. Han, T. Arslan, A.T. Erdogan, and M. Hasan, ‘Multiplier-less based parallel-pipelined FFT architectures for wireless communication applications.’ Proceedings of the IEEE International Conference on Acoustics, Speech and Signal Processing, Volume 5, 18-23 Edinburgh University, UK., Mar 2005, pp: v/45-v/48.