Improved low-complexity zero-padded OFDM receivers |
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| Affiliation: | 1. Department of Electrical and Electronics Engineering, Istanbul University, 34320, Avcilar, Istanbul, Turkey;2. Wireless Technology Center, Indiana University–Purdue University Fort Wayne (IPFW), USA;1. LACL, University of Paris-Est, France;2. L2TI, University of Paris 13, France;1. Department of Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI 48109, USA;2. Department of Electrical Engineering, University of Brasília, P.O. Box 4386, 70910-900 Brasília, Brazil;3. Department of Electronic Engineering, City University of Hong Kong, Hong Kong, China;4. College of Information Engineering, Shenzhen University, Shenzhen, 518060, China;1. Siemens Industry Software, Interleuvenlaan 68, BE-3001 Leuven, Belgium;2. Department of Aeronautical and Vehicle Engineering, KTH Royal Institute of Technology, Teknikringen 8, SE-10044 Stockholm, Sweden;3. Department of Applied Physics, University of Eastern Finland, P.O. Box 1627, FIN-70211 Kuopio, Finland;1. VRIT Lab - Military Academy of Tunisia, Nabeul 8000, Tunisia;2. CISS Departement - Royal Military Academy (RMA), Brussels 1000, Belgium;3. SERCOM Lab - EPT University of Carthage, Marsa 2078, Tunisia |
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| Abstract: | The recently suggested Generalized Prefix–Orthogonal Frequency Division Multiplexing (GP–OFDM) uses an optimal non-zero guard interval (GI). A GI consisting of all zeros is also known, and the technique is referred to as Zero Padding (ZP–OFDM). ZP–OFDM performs very well, but suffers from a complexity problem. This paper provides two improved and low-complexity receiver designs for ZP–OFDM, which make the convolutions between the transmitted signal and the channel skew-cyclic. The channel matrix becomes ϕ-circulant. Both designs require a one-dimensional optimization. The first new design requires the result of the optimization to be available at the transmitter. The second new design eliminates completely the feedback to the transmitter. Simulation results indicate that proposed ZP–OFDM receivers have significant performance advantages compared with existing ZP–OFDM receivers such as ZP–OFDM–OLA and ZP–OFDM–FAST. The performance advantages are maintained in the presence of channel estimation errors and error-correction coding. |
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| Keywords: | Orthogonal frequency-division multiplexing (OFDM) Guard interval Equalization Zero padding Skew-cyclic convolution |
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