WISERNETS · WIreless SEnsoR Networks for cognitivE sofTware radioS
FP7 — People (Marie Curie Actions)
- Duration
- 2011-01-01 → 2012-12-31
- EU contribution
- €153,917
- Participants
- 1
- Scheme
- MC-IEF
Lines connect the coordinator with its partners.
Results in brief
Wireless sensor networks for cognitive software radios
The increasing demand for higher data rates in wireless communications in limited or under-utilised spectral resources has motivated the introduction of cognitive radio (CR). The basic idea of CR is that a terminal with cognitive capabilities can exploit the underutilised spectral resources without interfering with primary users which have the priority to use the licensed spectral resources. In this project, we studied a spectrum cartography (SC) approach for CR where the wireless terminals evaluate transmission opportunity for local or cooperative communications coexisting with traditional communication between terminals and basestation (BS). We proposed a SC approach where the CR terminals ?rst collaborate with a wireless sensor network to estimate the spectrum map using a distributed kriging algorithm based on the exploitation of the spatial correlation of the power distribution on a determined area. Afterwards the CR terminals consult the maps and optimise its local communications, i.e. bypassing the BS for a mobile-to-mobile communications or enabling cooperative communications. We studied also the so-called underlay scenario where we decided to use ultra-wideband (UWB) technology to keep the transmission power of secondary users below the noise ?oor of primary users. In this case it is not necessary detection information but the main problem is to control the multi-user interference generated by other UWB cognitive users that access the network at the same time and in the same area. This interference can signi?cantly degrade the performance of the cognitive users. We proposed a mutual-information based rate adaptation technique that allows to guarantee a ?xed quality of service (QoS). The proposed algorithms are being tested with universal software radio peripheral (USRP) technology.
Data: CORDIS, © European Union
Project objective
Many spectrum measurements have evidenced great temporal and geographical variability in the usage of licensed spectral bands. In conjunction with fixed spectrum assignment policies and the limited amount of available radio spectrum, this results in low efficiency in the use of this scarce resource. Cognitive radios provided with Dynamic Spectrum Access (DSA) capabilities will improve this situation by granting unlicensed 'secondary' networks access to licensed bands in an opportunistic manner, as long as interference with licensed 'primary' networks is kept at tolerable levels. The capability to detect spectrum holes, without interfering with the primary network currently in use, is one the actual major difficulty faced by the cognitive radio, all the more as a fine granularity of allocation (time and frequency) is targeted. WISERNETS project will focus on developing innovative techniques based on wireless sensor networks to perform the sensing of the cognitive radios, supporting the coexistence of licensed primary and unlicensed secondary wireless users in a same area, analyzing also fundamental limits of performance using sofware defined radio terminals. This technology will allow addressing a very dynamic and competitive mixed radio access between cellular and broadband technologies. The sensor network aided cognitive radio proposed and studied in this project will address several objectives, including: a) novel spectrum distributed sensing techniques to be able to identify spectrum holes, b) corresponding information management and exploitation to achieve the co-existence of cognitive secondary radios with primary licensed technology, without generating harmful interferences. The project will integrate a wireless sensor network for cognitive radio with sofware defined radio terminals to emulate primary and secondary users. This demonstrator will be used to evaluate the performance of the proposed architecture.
Original text from CORDIS.
Participants
- UNIVERSITAT DE VALENCIA · ValenciaCoordinatorSpain
Links
Data: CORDIS, © European Union