On Synchronization of Opportunistic Radio OFDM Systems

Krondorf, M.; Liang, Ting-Jung; Fettweis, Gerhard

doi:10.1109/vetecs.2008.388

Cited by 12 publications

(1 citation statement)

References 6 publications

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“…In particular, because cognitive radios can configure spectrum usage flexibly, a key challenge is how to identify the pattern of spectrum usage at each receiver to decode the message successfully. Prior work [2][4] [5] assumes that each transmitter informs its receiver the spectrum usage explicitly via a control channel.…”

Section: Introductionmentioning

confidence: 99%

Preamble Design for Non-Contiguous Spectrum Usage in Cognitive Radio Networks

Feng¹,

Zheng

Wang³

et al. 2009

2009 IEEE Wireless Communications and Networking Conference

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Abstract-Cognitive radios can significantly improve spectrum efficiency by using locally available spectrum. The efficiency, however, depends heavily on their transceiver design. In particular, being able to use non-contiguously aligned spectrum bands simultaneously is a critical requirement. Prior work in this area requires a control channel so that transmitter/receiver pairs can synchronize on their spectrum usage patterns. However, this approach can suffer from high cost and control congestion. In this paper, we propose an in-band solution for informing receivers the spectrum usage patterns. By judiciously designing packet preambles, we embed the spectrum usage patterns in each data packet. Using the legacy 802.11 preamble structure, we focus on choosing the appropriate preamble sequences to maintain reliable packet detection in the presence of noise and interference. We verify our design using simulation and show that it can lead to reliable packet transmissions comparable to those of contiguous spectrum usage. We also identify the impact of interference on our design and propose refinements to choose the preamble sequence using information on the interference.

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Section: Introductionmentioning

confidence: 99%