Sidelobe Suppression in OFDM Spectrum Sharing Systems Via Additive Signal Method

Cosovic, I.; Mazzoni, T.

doi:10.1109/vetecs.2007.553

Cited by 29 publications

(18 citation statements)

References 3 publications

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“…In the literature, many sidelobe reduction techniques have been proposed such as insertion of cancellation carriers (CCs) [2], subcarrier weighting [3], constellation expansion (CE) [4], multiple-choice sequences [5], extended active interference [6,7], additive signal method [8]. Most of these techniques involve complex optimization that has to be performed for each OFDM symbol which is not suitable for real-time applications.…”

Section: Introductionmentioning

confidence: 99%

Efficient sidelobe suppression for OFDM systems using advanced cancellation carriers

Selim

Macaluso

Doyle

2013

2013 IEEE International Conference on Communications (ICC)

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The concept of cancellation carriers (CCs) has been proposed in the literature for sidelobe suppression for orthogonal frequency division multiplexing (OFDM) systems. Subcarriers at the edges of the OFDM spectrum are used for sidelobe reduction while the remaining subcarriers are used for data transmission. Existing CCs techniques require performing complex optimization that should be applied for each OFDM symbol which is not suitable for real-time applications. In this paper, we propose a heuristic approach for CCs. The proposed algorithm involves few computations compared with all other techniques proposed in the literature. Simulation results show that sidelobe reduction performance can be close to the optimal. Moreover, the proposed algorithm is implemented in a software defined radio and implementation results prove that it can be introduced for real-time applications.

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Section: Introductionmentioning

confidence: 99%

Efficient sidelobe suppression for OFDM systems using advanced cancellation carriers

Selim

Macaluso

Doyle

2013

2013 IEEE International Conference on Communications (ICC)

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“…Multiplying signals with a shaping filter equals to a convolution in time-domain which brings the interference between OFDM symbols. Furthermore, some techniques which do not use the symbol processing are proposed such as additive signals (AS) [6] and subcarriers weighting (SW) [7]. They are useful in reducing the sidelobe power.…”

Section: Introductionmentioning

confidence: 99%

Sidelobe Suppression in CR-OFDM system by Adding Extended Data Carriers

Tianwei¹,

Wang²

2013

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Out-band radiation is a severe problem for Cognitive Radio with OFDM system (CR-OFDM) which is caused by the sidelobe of OFDM signals. Lots of studies have been done on suppressing the sidelobe power and numerous methods have been proposed. In this paper, we propose a novel method to minimize the sidelobe by adding extended data carrier so called EDC to the original data carriers so as to protect primary user (PU) spectrum. Unlike the methods before, the EDCs are deployed within the secondary user (SU) data frequency spectrum to fully use the spectrum. Moreover, we derive the linear least squares problem to get the optimal weighting factors of EDCs to minimize the sidelobe power which is subject to an original data interference constraint. By simulation, we find that EDC is more capable in sidelobe suppression than method of Cancellation Carrier (CC) while EDC has only a small loss in BER performance.

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“…Its drawback is the degradation of BER, because of varying power of particular subcarriers that changes SNR and makes demodulation less efficient. There are also other solutions such as ASM (Additive Signal Method) [12] or AST (Adaptive Symbol Transition) [13], which cause moderate loss in BER performance and small decrease of the useful symbol energy.…”

Section: Introductionmentioning

confidence: 99%

Efficient methods of interference suppression for spectrum pooling cognitive radios using OFDM signals

Malon

Łopatka

2011

2011 5th International Conference on Signal Processing and Communication Systems (ICSPCS)

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Cognitive radio networks are promising systems to enable efficient use of spectral resources, thanks to identification of Primary Users (PU) possessing guaranteed radio resources and Secondary Users (SU), trying to use temporary unused channels. Assuming that PU traffic is low, it can switch off specific subcarriers in OFDM signal and this subbands can be used by SU. The proposed method is based on spectrum pooling, assuming that secondary users spectrum access is flexible and should not degrade performance of the licensed user link. As an adaptive modulation scheme, a use of OFDM modulation is proposed, but to use this technique it is necessary to reduce out of band interference. This paper compares four methods and present results of laboratory tests on real OFDM signals.

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Sidelobe Suppression in OFDM Spectrum Sharing Systems Via Additive Signal Method

Cited by 29 publications

References 3 publications

Efficient sidelobe suppression for OFDM systems using advanced cancellation carriers

Efficient sidelobe suppression for OFDM systems using advanced cancellation carriers

Sidelobe Suppression in CR-OFDM system by Adding Extended Data Carriers

Efficient methods of interference suppression for spectrum pooling cognitive radios using OFDM signals

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