Name
Title | ||
|---|---|---|
Opportunity detection for OFDMA-based cognitive radio systems with timing misalignment |
Abstract | ||
|---|---|---|
Accurate detection of spectrum opportunities within the frequency band of an orthogonal frequency division multiple access (OFDMA) system carries critical importance for OFDMA-based cognitive radios. In this paper, we analyze the opportunity detection performances of energy detection and ESPRIT (estimation of signal parameters by rotational invariance techniques) algorithms in the presence of timing misalignments in uplink (UL) OFDMA. For the energy detector, the statistics of subcarrier power are derived considering timing misalignments, and they are verified through computer simulations. Using these statistics, which take inter-carrier-interference (ICI) effects into account, receiver operating characteristics (ROCs) of the energy detector receiver are obtained. It is shown that energy detection has a considerably better performance than ESPRIT, especially when the subcarrier assignment changes frequently. Moreover, a closed form expression is derived for the UL-OFDMA synchronization point that minimizes the ICI. Finally, it is shown that employing resource allocation blocks with larger sizes in the primary network yields better opportunities for the cognitive radio. |
Year | DOI | Venue |
|---|---|---|
2009 | 10.1109/TWC.2009.090226 | IEEE Transactions on Wireless Communications |
Keywords | Field | DocType |
timing misalignments,cognitive radio,ofdma-based cognitive radio,better opportunity,energy detector receiver,ofdma-based cognitive radio system,energy detector,accurate detection,better performance,opportunity detection performance,energy detection,receiver operating characteristics,ofdm,femtocell,signal analysis,algorithm design and analysis,ofdm modulation,detectors,resource allocation,computer simulation,parameter estimation,interference,statistics,receiver operator characteristic,spectrum | Subcarrier,Telecommunications,Frequency band,Software-defined radio,Orthogonal frequency-division multiple access,Electronic engineering,Real-time computing,Frequency-division multiple access,Detector,Mathematics,Orthogonal frequency-division multiplexing,Cognitive radio | Journal |
Volume | Issue | ISSN |
8 | 10 | 1536-1276 |
Citations | PageRank | References |
13 | 0.88 | 20 |
Authors | ||
3 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Mustafa E. Sahin | 1 | 106 | 9.09 |
| Ismail Güvenç | 2 | 2041 | 153.03 |
| Hüseyin Arslan | 3 | 332 | 33.33 |