Resource Allocation in a Cognitive Radio System with Imperfect Channel State Estimation
نویسندگان
چکیده
منابع مشابه
Resource Allocation in a Cognitive Radio System with Imperfect Channel State Estimation
Cognitive radio (CR) is a promising concept for improving the utilization of scarce radio spectrum resources. Orthogonal frequency division multiplexing (OFDM) is regarded as a technology which is well-matched for CR systems. In this paper, it is shown that channel estimation errors can result in a severe performance degradation in a multi-user OFDM CR system. A simple back-off scheme is propos...
متن کاملDynamic Resource Allocation with Imperfect Channel Sensing –Heterogeneous Services in Cognitive Radio Network
In cognitive radio networks (CRN), resource should dynamically be assigned to the users with respect to sensed radio atmospheres. Many works has been done for dynamic allocation but it is not practically easy because the secondary network is very difficult to know the right knowledge of dynamic radio atmospheres in CRN. In this object we study the different methods of dynamic resource allocatio...
متن کاملRobust beamforming and power allocation in cognitive radio relay networks with imperfect channel state information
The authors study robust beamforming and power allocation in cognitive relay networks using several relays in the secondary link. The channel state information is imperfect modelled by Gaussian random variables. First, minimisation of the total transmit power of relays and the secondary transmitter is considered with a constraint on the interference in the primary receiver. Also, a constraint i...
متن کاملResource Allocation in Cognitive Radio
For the traditional wireless services, fixed spectrum allocation is the major spectrum allocation methodology. As per this methodology to avoid interference, different wireless services are allocated with different licensed bands. With various emerging wireless technologies, fixed spectrum allocation strategy has resulted scarcity in radio spectrum, due to the fact that most of the available sp...
متن کاملOptimal Resource Allocation in OFDMA Systems with Imperfect Channel Knowledge
Previous research efforts on OFDMA resource allocation have typically assumed the availability of perfect channel state information (CSI). Unfortunately, this is unrealistic, primarily due to channel estimation errors, and more importantly, channel feedback delay. In this paper, we develop optimal resource allocation algorithms for OFDMA systems assuming the availability of only partial (imperf...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Electrical and Computer Engineering
سال: 2010
ISSN: 2090-0147,2090-0155
DOI: 10.1155/2010/419430