Name
Abstract | ||
|---|---|---|
A novel low complexity active interference cancellation (AIC) scheme for primary user (PU) protection is presented for application to cognitive orthogonal frequency division multiplexing (OFDM) systems, in which out-of-band radiation spilling over the PU protected band is to be minimized. A set of cancellation subcarriers are modulated by appropriate linear combinations of the remaining data subcarriers. The combination weights are fixed so that, in contrast with previous AIC approaches, they need not be recomputed on a symbol-by-symbol basis. Weight optimization can thus be carried out offline, drastically reducing the online computational cost. In addition, it is shown that by carefully selecting the location of cancellation subcarriers, significant performance improvements can be achieved. Given that finding the optimal location is an intractable combinatorial problem, an heuristic approach is proposed, based on a greedy search which provides a good tradeoff. The proposed scheme is shown to outperform current AIC solutions both in terms of performance and computational cost, obtaining significant improvements in terms of notch depth, with almost 50 dB depth in typical settings, to protect a narrowband PU inside the secondary user OFDM band. Further, experimental measurements from the implementation of the proposed scheme on both professional and off-the-shelf hardware platforms validate its effectiveness. |
Year | DOI | Venue |
|---|---|---|
2013 | 10.1109/JETCAS.2013.2280808 | Emerging and Selected Topics in Circuits and Systems, IEEE Journal |
Keywords | Field | DocType |
OFDM modulation,cognitive radio,greedy algorithms,interference suppression,optimisation,search problems,AIC scheme,cancellation subcarriers,cognitive OFDM,cognitive orthogonal frequency division multiplexing systems,greedy search,intractable combinatorial problem,novel low complexity active interference cancellation scheme,out-of-band radiation spilling,primary user protection,symbol-by-symbol basis,weight optimization,Active interference cancellation (AIC),cognitive radio,low complexity design,orthogonal frequency division multiplexing (OFDM),primary user protection | Linear combination,Heuristic,Narrowband,Computer science,Single antenna interference cancellation,Greedy algorithm,Electronic engineering,Orthogonal frequency-division multiplexing,Cognitive radio | Journal |
Volume | Issue | ISSN |
3 | 4 | 2156-3357 |
Citations | PageRank | References |
3 | 0.42 | 0 |
Authors | ||
5 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Jorge F. Schmidt | 1 | 33 | 10.28 |
| Secundino Costas-Sanz | 2 | 3 | 0.42 |
| Roberto López-Valcarce | 3 | 300 | 41.00 |
| Costas-Sanz, S. | 4 | 3 | 0.42 |
| Lopez-Valcarce, R. | 5 | 40 | 3.96 |