Architectural overview of the SPEAKeasy system

Stochastic Traffic Engineering in Multihop Cognitive Wireless Mesh Networks

“…The current cognitive radio devices benefit largely from the software-defined radio (SDR) techniques with advanced coding/modulation capabilities. For example, by utilizing the multicarrier modulation, e.g., OFDMA, a cognitive radio device can utilize all the disjoint available frequency band simultaneously [20], [21], [27], [28], [29]. At the transmitter, a software-based radio combines waveforms for different subbands and thus transmit signal at these subbands simultaneously.…”

“…At the transmitter, a software-based radio combines waveforms for different subbands and thus transmit signal at these subbands simultaneously. While at the receiver, a software-based radio decomposes the combined waveforms and thus receives signal at these subbands simultaneously [22], [23], [28], [29]. In this paper, we assume a spectrum sensing scheme available that each node can sense the presence of the primary users in range, such as [1], [30], although the time of random returns cannot be predicted.…”

“…In this paper, we assume a spectrum sensing scheme available that each node can sense the presence of the primary users in range, such as [1], [30], although the time of random returns cannot be predicted. A link will utilize all the available vacant bands and that the cognitive radios are full-duplex and can transmit at different bands concurrently [22], [23], [28], [29]. We further assume that some scheduling mechanism is in place or some physical layer mechanisms are utilized such that the nodes cannot interfere with each other during the transmissions.…”

Supporting Integrated MAC and PHY Software Development for the USRP SDR

“…Early SDRs include SPEAKeasy [12][13] and RDRN [14]. They were mostly designed to meet the requirements of the military, i.e.…”

Software Defined Radio: Challenges and Opportunities

“…This demand has resulted in several major governmental development programmes, e.g. in the US the SpeakEasy I, the SpeakEasy II [6] and the ongoing Joint Tactical Radio System (JTRS) [7]- [9] programme. Examples from Europe are the "Software Radio Architecture" Plan d'Etude Amont (PEA) [10], [11] in France, the Terminal Radio Software (TERSO) programme [12] in Spain, the Finnish Software Radio Programme (FSRP) [13], the Swedish Common Tactical Radio System (GTRS) [14], [15] and the European Secured Software Defined Radio Referential (ESSOR) [16] programme.…”