Repeated open spectrum sharing games in Java Receive QR Code in Java Repeated open spectrum sharing games

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Repeated open spectrum sharing games using java tobuild qr barcode for web,windows application Microsoft Office Development. Microsoft Office 2000/2003/2007/2010 In dynamic Java QR Code JIS X 0510 spectrum access, users who are competing with each other for spectrum may have no incentive to cooperate, and they may even exchange false private information about their channel conditions in order to gain more access to the spectrum. In this chapter, we present a repeated spectrum sharing game with cheat-proof strategies. In a punishment-based repeated game, users have an incentive to share the spectrum in a cooperative way; and, through mechanism-design-based and statisticsbased approaches, user honesty is further enforced.

Speci c cooperation rules have been developed on the basis of maximum-total-throughput and proportional-fairness criteria. Simulation results show that the scheme presented here can greatly improve the spectrum ef ciency by alleviating mutual interference..

Introduction In order t Java QR Code JIS X 0510 o achieve more exible spectrum access in long-run scenarios, we need to address the following challenges. First, in self-organized spectrum sharing, there is no central authority to coordinate the spectrum access of different users. Thus, the spectrum access scheme should be able to adapt distributively to the spectrum dynamics, e.

g., channel variations, with only local observations. Moreover, users competing for the open spectrum may have no incentive to cooperate with each other, and they may even exchange false private information about their channel conditions in order to gain more access to the spectrum.

Therefore, cheat-proof spectrum sharing schemes should be developed in order to maintain the ef ciency of the spectrum usage. Motivated by the preceding considerations, in this chapter we present a cheat-proof etiquette for unlicensed spectrum sharing by modeling the distributed spectrum access as a repeated game. In this game, punishment will be triggered if any user deviates from cooperation, and hence users are forced to access the spectrum cooperatively.

We consider two sharing rules, which are based on the maximum-total-throughput and proportional-fairness criteria, respectively. Accordingly, two cheat-proof strategies are developed: one provides players with the incentive to be honest on the basis of mechanism-design theory [123], whereas the other makes cheating nearly unpro table by statistical approaches. Therefore, the competing users are enforced to cooperate with each other honestly.

The simulation results show that such schemes can greatly improve the spectrum ef ciency under mutual interference.. Repeated open spectrum sharing games The remain Java QR Code der of this chapter is organized as follows. In Section 4.2, the system model for open spectrum sharing is described.

In Section 4.3, we develop a punishmentbased repeated game for open spectrum sharing. The speci c design of cooperation rules and misbehavior detection are discussed in Section 4.

4. In Section 4.5, we develop two cheat-proof strategies for the spectrum sharing rules.

Simulation results are shown in Section 4.6..

The system model We conside Java qr-codes r a situation in which K groups of unlicensed users coexist in the same area and compete for the same unlicensed spectrum band, as shown in Figure 4.1. The users within the same group attempt to communicate with each other, and their usage of the spectrum will introduce interference with other groups.

For simplicity, we assume that each group consists of a single transmitter receiver pair, and that all the pairs are fully loaded, i.e., they always have data to transmit.

At time slot n, all pairs are trying to occupy the spectrum, and the received signal at the ith receiver yi [n] can be expressed as. yi [n] =. h ji [n]x j [n] + wi [n],. i = 1, 2, . . .

, K ,. (4.1). where x j [n] is the transmitted information of the jth pair, h ji [n]( j = 1, 2, . . .

, K ; i = 1, 2, . . .

, K ) represents the channel gain from the jth transmitter to the ith receiver, and wi [n] is the white noise at the ith receiver. In the rest of the chapter, the time index n will be omitted wherever no ambiguity is caused. We assume that 2 the channels are Rayleigh fading, i.

e., h ji CN 0, ji , and distinct h ji are statistically independent. The channels are assumed to remain constant during one time slot, and change independently from slot to slot.

The noise is independently identically distributed (i.i.d.

) with wi CN (0, N0 ), where N0 is the noise power. Being limited by.
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