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Energy consumption reducing in wireless communications has attracted increasing attention recently. Power control is a key technology for cognitive networks, which can affect energy saving of cognitive network and interfere with primary networks. In this paper, we jointly consider power control in physical layer, scheduling in link layer and routing in network layer to present a cross-layer optimization...
The use of active narrowband interference (NBI) suppression in direct-sequence spread-spectrum (DS-SS) communications has been extensively studied. In this paper, we address the problem of optimum coding–spreading tradeoff for NBI suppression. With maximum-likelihood (ML) decoding, we first derive upper bounds on the error probability of coded systems in the presence of a special class of NBI, namely,...
We propose a low-rate turbo-Hadamard coding approach for narrow-band interference (NBI) suppression. The proposed approach can be viewed as the employment of a coded spread-spectrum signalling with time-varying spreading sequences and the NBI suppression is naturally achieved in iterative decoding. Compared with the traditional code-aided NBI suppression with direct-sequence spread-spectrum (DS-SS)...
The cooperative CDMA system proposed in this paper performs two phases of transmission. In phase I, each user node transmits its own information which is received by the base station (BS) as well as the other user nodes; in phase II, each partner node relays a processed version of the information received in the previous phase. Two iterative detectors are developed at the B S to combat multiple access...
Cognitive radio can effectively improve spectrum utilization by allowing the secondary user to access spectrum licensed to the primary user. According to cognitive radio principle, the secondary user can access the channel only when sensed idle. In this paper, we study the spectrum-sharing problem of a basic cognitive network consisting of a primary user (PU) link and a secondary user (SU) link, and...
Based on interference temperature model, the spectrum sharing problem between the secondary user and primary user can be formulated as optimization problem. In this paper, we propose a suboptimal distributed non-cooperative game theoretic power control algorithm for solving this optimization problem. Simulation results show that the proposed algorithm provides significant power saving compared to...
The self-mixing interference in a composite four-mirror cavity (CFMC) laser was investigated experimentally and theoretically for the first time. The dual optical feedback sawtooth-liked curve is observed and the characteristics is described and analyzed.
We study distributed power control for cognitive radio in this paper. The cognitive radio environment of multiusers is viewed as a non-cooperative game. In the condition of incomplete information, the efficient power control for two users can be realized by finite repeated gaming. If the repeated times M satisfy certain term, the two users can cooperate in the preceding phase of the repeated gaming,...
In this paper, we develop a multi-user cognitive radio sharing network based on opportunistic spectrum access, where primary and secondary users can peacefully coexist in the same system to share the spectrum and improve the utility of licensed spectrum. Under this scenario, we introduce two constraints to guarantee their successful transmission, interference temperature limit at the primary users...
Wireless mesh networks (WMNs) integrate the advantages of WLAN and mobile ad hoc network and have become the key technique of next-generation wireless network. Routing plays a significant role in WMNs. The existed routing protocols used in ad hoc network cannot fully fit the characteristics of WMNs. Based on WCETT and channel cost metric (CCM) routing rules, this paper proposes a new multi-channel...
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