NDLI: Fast Computation of Partial DFT for Comb Spectrum Evaluation

Content Provider	IEEE Xplore Digital Library
Author	Khan, Z.A. Qadeer, S.A. Khan, Y.
Copyright Year	2006
Description	Author affiliation: Md. M.J.C.E.T, Hyderabad, India (Qadeer, S.A.; Khan, Y.) \|\| Md. IIIT, Hyderabad, A.P., India. Email: zafar@iiit.ac.in (Khan, Z.A.)
Abstract	A comb spectrum evaluation problem arises in the channel estimation of pilot symbol-assisted modulation (PSAM) systems and also in the (de) modulation of multichannel communication system based on orthogonal frequency division multiplexing (OFDM). In this paper we decompose a M-component comb spectrum evaluation with transform length N into i) a FFT evaluation of transform length M of a length M vector, ii) which in turn is obtained from the length N input vector (by folding and scaling). This decomposition allows for the application of split-radix and radix-4 algorithms for evaluation of M length transform and efficient computation of the length M vector from the length N input vector, which is classically termed as `pruning'. When N = 2p, the comb spectrum computation requires only N/8+M/3log2M nontrivial complex multiplications, if N/M ¿ 8. In addition, conditions under which comb spectrum evaluation can be done in O(M log M) complex multiplies are identified.
Starting Page	3213
Ending Page	3218
File Size	152191
Page Count	6
File Format	PDF
ISBN	1424403553
ISSN	81649547
DOI	10.1109/ICC.2006.255301
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-06-11
Publisher Place	Turkey
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Discrete Fourier transforms Narrowband Channel estimation OFDM modulation Mobile communication Interference Working environment noise Frequency diversity Mobile computing Frequency conversion
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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