Sökning: onr:"swepub:oai:DiVA.org:kth-136554" >
Cooperative Cogniti...
Cooperative Cognitive Networks : Optimal, Distributed and Low-Complexity Algorithms
-
Zheng, Gan (författare)
-
Song, Shenghui (författare)
-
Wong, Kai-Kit (författare)
-
visa fler...
-
- Ottersten, Björn, 1961- (författare)
- University of Luxembourg
-
visa färre...
-
(creator_code:org_t)
- 2013
- 2013
- Engelska.
-
Ingår i: IEEE Transactions on Signal Processing. - 1053-587X .- 1941-0476. ; 61:11, s. 2778-2790
- Relaterad länk:
-
https://urn.kb.se/re...
-
visa fler...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- This paper considers the cooperation between a cognitive system and a primary system where multiple cognitive base stations (CBSs) relay the primary user's (PU) signals in exchange for more opportunity to transmit their own signals. The CBSs use amplify-and-forward (AF) relaying and coordinated beamforming to relay the primary signals and transmit their own signals. The objective is to minimize the overall transmit power of the CBSs given the rate requirements of the PU and the cognitive users (CUs). We show that the relaying matrices have unity rank and perform two functions: Matched filter receive beamforming and transmit beamforming. We then develop two efficient algorithms to find the optimal solution. The first one has a linear convergence rate and is suitable for distributed implementation, while the second one enjoys superlinear convergence but requires centralized processing. Further, we derive the beamforming vectors for the linear conventional zero-forcing (CZF) and prior zero-forcing (PZF) schemes, which provide much simpler solutions. Simulation results demonstrate the improvement in terms of outage performance due to the cooperation between the primary and cognitive systems.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)
Nyckelord
- Cognitive relaying
- cooperation
- coordinated beamforming
- relaying
- zero-forcing
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas