Analysis of Dynamic Spectrum Leasing for Coded Bi-Directional Communication

Abstract

Abstract-In this paper, we aim to present a cooperative relaying based two way wireless communication scheme which can provide both spectral and energy efficiency in future wireless networks. To this end, we propose a novel network coding based Dynamic Spectrum Leasing (DSL) technique in which the cognitive secondary users cooperatively relay the primary data for two-way primary communication. In exchange for the relaying services, the primary grants exclusive access to the secondary users for their own activity. We model the random geometry of the ad hoc secondary users using a Poisson point process. We devise a game theoretic framework for the division of leasing time between the primary cooperation and secondary activity phases. We demonstrate that under these considerations and employing network coding, DSL can improve the number of bits that are successfully transmitted by 54% as compared to un-coded direct two way primary communication. Also the energy costs of the proposed DSL scheme are more than 10 times lower. Employing DSL also enables the cognitive users to get reasonable time for their own transmission after increasing the primary spectral and energy efficiency.

Dynamic Spectrum Leasing for Bi-Directional Communication: Impact of Selfishness

“…In both [8] and [9], mutual agreement is not modeled for the division of time and the spatial locations of the nodes in the network are also ignored. In an earlier work [12], we provided a mathematical model of a two way relaying scheme considering the geometry of the network. The work in [12] assumes full decoding, applying network coding and forwarding scheme at the CRs which takes three time slots.…”

“…In an earlier work [12], we provided a mathematical model of a two way relaying scheme considering the geometry of the network. The work in [12] assumes full decoding, applying network coding and forwarding scheme at the CRs which takes three time slots. However in this paper, we remove the overhead of complete decoding at the CRs and exploit the natural network coding taking place in the air [6] via PNC.…”

“…Following this, the exchange of data between the primary nodes only takes two time slots. Also, unlike [12], in this paper we consider denoising and distributed beamforming at the relays. It removes the need for the primary network to be aware of the channel statistics between them and the CR network while decoding the relayed data.…”

Resource allocation for spectrum-leasing based CRN with delay-sensitive traffic

“…And with the help of the information theory, there has been extensive research on how to guarantee the benefits of spectrum-leasing based CRN via optimally allocate the wireless resources among PUs and SUs [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18], and a good summary of the state of the art is provided in [3,4]. Thereinto, the cooperation among PUs and SUs was commonly modeled by the convex optimization problem [5,6] where the globally optimal resource allocation is analytically derived, or by employing the widely used economical concepts, such as a Stackelberg game [2], a Nash Bargaining game [7][8][9], contract theory [10,11], auction theory [12,13], matching theory [14], etc. For example, aiming to optimally calculate the design parameters of the primary and secondary networks, [5] has considered the problem of maximizing the smaller of secondary transceiver average rates, while preserving a minimum rate for the primary pair.…”

Precoder Design and Power Allocation for MIMO Cognitive Radio Two-Way Relaying Systems

“…Consequently, having two transceivers from both sides, transmission requires four time slots to be accomplished. Recently, the two-way relaying [20]- [22] (TWR) has been proposed as an efficient way to accomplish the transmission in two time slots only [23], [24]. In the first time slot, the relay receives two signals from the communication terminals.…”