DocumentCode :
2653035
Title :
Fast Fading Implementation Optimization in an OFDMA System Simulator
Author :
Monghal, G. ; Kovács, I.Z. ; Pokhariyal, A. ; Pedersen, K.I. ; Rosa, C. ; Mogensen, P.E.
Author_Institution :
Aalborg Univ.
fYear :
2007
fDate :
22-25 April 2007
Firstpage :
1214
Lastpage :
1218
Abstract :
In this paper, we investigate methods for improving an OFDMA system simulator in terms of trade-off between complexity and radio channel implementation accuracy. Fast fading and SINR calculations are the most resource consuming tasks of a system simulator. In order to decrease their complexity, it is proposed to reduce the number of calculated channel transfer function (CTF) realizations according to the time and frequency correlation properties of the simulated radio channel. Besides, we highlight that the upsampling of the channel impulse response (CIR), which is needed for the fast Fourier transform (FFT) application, may introduce major errors in the channel frequency statistics if it is done by simple brute force grid alignment (BFGA) method. To achieve better results we introduce a low complex upsampling method which reduces the simulation inaccuracies significantly. The possibility to trade complexity for precision is shown. It is possible for instance to divide the fast fading and SINR calculation complexity by 50 while keeping a reasonable simulation accuracy.
Keywords :
OFDM modulation; fading channels; fast Fourier transforms; frequency division multiple access; time-frequency analysis; OFDMA system simulator; SINR calculation complexity; brute force grid alignment method; channel frequency statistics; channel impulse response; channel transfer function; fast Fourier transform; fast fading implementation optimization; low complex upsampling method; radio channel; radio channel implementation; time-frequency correlation properties; Error analysis; Fading; Fast Fourier transforms; MIMO; Optimization methods; Radio link; Receiving antennas; Signal to noise ratio; System performance; Transfer functions;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 2007. VTC2007-Spring. IEEE 65th
Conference_Location :
Dublin
ISSN :
1550-2252
Print_ISBN :
1-4244-0266-2
Type :
conf
DOI :
10.1109/VETECS.2007.256
Filename :
4212684
Link To Document :
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