Making optimal use of the asymmetric interference channel

Learned, Rachel E.

doi:10.1109/acssc.2011.6190315

Cited by 4 publications

(7 citation statements)

References 9 publications

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“…To this end, we must determine the probability of successful coexistence with a single, randomly chosen macro link. 2 Before showing results from the "play nice" settling process, we show the results from a MUD-only small cell scenario and determine the harm that would come to the macro links if no cognition were employed in the small cell. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…As discussed in [2], the asymmetric channel that arises from coexistence with the nearby-UE scenario is ideal for a MUD receiver and would no longer be off-limits for assignment by the small cell. This interference-limited case is another lost opportunity that could be advantaged by having a MUD in the small cell receivers.…”

Section: Small Cell Operationmentioning

confidence: 98%

“…A dominant term in this grading function is derived from the information theoretic joint rate region and the location of the possible rate pairs with respect to the boundaries of that region. A more detailed treatment of the joint rate region based grading is conveyed in [2], [20], [21]. Another term in this grading function is based upon historical information collected about each signal (if any exists).…”

Section: Cognitive Coexistence Strategymentioning

confidence: 99%

“…For the case where only one of the interfering transmitters were under the control of a MUD-enabled receiver and the others belong to traditional networks (no MUDs, and no sourcesplitting), a straight underlay [2] or source-splitting approach [10] could be used, but coexistence would be successful in a very small subset of scenarios. For example, the secondary transmitter could occupy the same band as a primary user by carefully adhering to the source-splitting strategy cited above and using a SIC-MUD in the receiver.…”

Section: Introductionmentioning

confidence: 99%

“…In a packetbased standard such as 802.11, this would mean that packets could survive collisions, so the medium access controller (MAC) could orchestrate transmissions to encourage collisions instead of avoid them, as is done today. The interference multiple access (IMA) paradigm 1 is a general concept that includes the MUD-enabled overlay/underlay paradigm emerging as a solution for the growing shortage in commercial spectrum [2], [3], [4], [5], [6], [7]. For the specific case of using a successive interference cancellation (SIC) MUD, the idea of multiple signal underlay/overlay/layering is not new and goes by the name of rate-splitting or sourcesplitting [8], [9], [10].…”

Section: Introductionmentioning

confidence: 99%

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Cognitive coexistence: A throughput study of MUD-enhanced opportunistic spectrum access

Learned

Johnston²,

Kaminski

2013

2013 Asilomar Conference on Signals, Systems and Computers

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A new opportunistic spectrum access overlay/underlay paradigm for enabling heterogeneous wireless networks of primary and secondary, or multiple "secondary" users to coexist on the same frequency in the same geographic location is proposed and evaluated. In this new paradigm of cognitive coexistence, underlay nodes operate without overt coordination with overlay nodes or other underlay bases. Instead of overt coordination, the underlay nodes monitor their local environment and their effect upon it to determine acceptable channels for coexistence. Moreover, with the employment of multiuser detection in some or all of the underlay nodes (and in none of the overlay nodes), high rate underlay links are possible in the presence of even the most severe overlay interference. The result is a backward compatible coexistence of overlay and underlay nodes with high throughput for the underlay network while maintaining acceptable data rates for the overlay network. This paper describes what we define as the cognitive coexistence strategy (CCS) that enables nodes to determine among all occupied bands which band is most likely to result in a successful coexistence between its link and the already existing link on that band. The CCS takes advantage of the adaptive nature of the overlay nodes and the unpredictable, but often present asymmetric channel due to the different path losses between a transmitter and its intended and unintended receivers. This paper presents a preliminary simulation-based investigation of the opportunity that exists for a pair of cognitive coexistence radios (CCR) operating as a small cell base and mobile in an urban wireless cellular environment, showing sufficient opportunity for high throughput coexistence that can be advantaged by the cognitive capability of the CCR nodes.

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Section: Resultsmentioning

confidence: 99%

Section: Small Cell Operationmentioning

confidence: 98%