Cross-Band Interference Considered Harmful in OFDM Based Distributed Spectrum Sharing

Details Cross-Band Interference Considered Harmful in OFDM Based Distributed Spectrum Sharing Cross-Band Interference Considered Harmful in OFDM Based Distributed Spectrum Sharing

2010-05-16

arxiv.org/abs/1005.2731v1

Computer Science

Information Theory

Scientific paper

In the past few years we have witnessed the paradigm shift from static spectrum allocation to dynamic spectrum access/sharing. Orthogonal Frequency-Division Multiple Access (OFDMA) is a promising mechanism to implement the agile spectrum access. However, in wireless distributed networks where tight synchronization is infeasible, OFDMA faces the problem of cross-band interference. Subcarriers used by different users are no longer orthogonal, and transmissions operating on non-overlapping subcarriers can interfere with each other. In this paper, we explore the cause of cross-band interference and analytically quantify its strength and impact on packet transmissions. Our analysis captures three key practical artifacts: inter-link frequency offset, temporal sampling mismatch and power heterogeneity. To our best knowledge, this work is the first to systematically analyze the cause and impact of cross-band interference. Using insights from our analysis, we then build and compared three mitigating methods to combat cross-band interference. Analytical and simulation results show that placing frequency guardband at link boundaries is the most effective solution in distributed spectrum sharing, while the other two frequency-domain methods are sensitive to either temporal sampling mismatch or inter-link frequency offset. We find that the proper guardband size depends heavily on power heterogeneity. Consequently, protocol designs for dynamic spectrum access should carefully take into account the cross-band interference when configuring spectrum usage.

Affiliated with

Also associated with

No associations

Rating

Cross-Band Interference Considered Harmful in OFDM Based Distributed Spectrum Sharing does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Cross-Band Interference Considered Harmful in OFDM Based Distributed Spectrum Sharing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cross-Band Interference Considered Harmful in OFDM Based Distributed Spectrum Sharing will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-672058