Title :
A new flexible channel access scheme using overlap FFT filter-bank for dynamic spectrum access
Author :
Tanabe, Motohiro ; Umehira, Masahiro ; Ishihara, Koichi ; Takatori, Yasushi
Author_Institution :
Grad. Sch. of Sci. & Eng., Ibaraki Univ., Hitachi, Japan
Abstract :
An OFDMA based channel access scheme is proposed for dynamic spectrum access to utilize frequency spectrum efficiently. However, the OFDMA signal has large PAPR (Peak to Average Power Ratio). In addition, if the OFDMA receiver does not use filter(s) to extract block(s) of sub-carriers before FFT (Fast Fourier Transform), the designated sub-carriers suffer large ACI (Adjacent Channel Interference) in the FFT processing. To solve these problems of PAPR and ACI, this paper proposes a new flexible channel access scheme using overlap FFT filter-bank based on single carrier modulation for dynamic spectrum access. It also evaluates the performance by computer simulation.
Keywords :
OFDM modulation; fast Fourier transforms; frequency division multiple access; ACI; OFDMA based channel; OFDMA receiver; PAPR; adjacent channel interference; dynamic spectrum access; fast Fourier transform; flexible channel access scheme; frequency spectrum; overlap FFT filter-bank; peak to average power ratio; single carrier modulation; Computer simulation; Fast Fourier transforms; Interchannel interference; Peak to average power ratio; Channel Access; Dynamic Spectrum Access; Filter-bank; Overlap FFT;
Conference_Titel :
Communications, 2009. APCC 2009. 15th Asia-Pacific Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-4784-8
Electronic_ISBN :
978-1-4244-4785-5
DOI :
10.1109/APCC.2009.5375660