Exact(2)
Achieving spectrum flattening is an interesting property for combatting multipath as we shall see in the next section for another kind of waveform (more specifically balanced Walsh sequences).
Whereas the primary spectrum users access the RF channels in their normal ways, secondary users use their spectrum cognitive and agile capabilities to discover and use the under-utilized RF bands, originally allocated to the primary users, therefore achieving spectrum reuse for efficiency purposes.
Similar(58)
In cognitive radio, secondary users are allowed to access the licensed spectrum on the condition that secondary users protect the transmissions of primary users to achieve spectrum sharing.
As a consequence, it is possible to achieve spectrum access for the WSN without compromising on the performance of either systems.
To achieve spectrum sharing without degrading the performance of the primary system, the secondary transmitters alternate between cooperation and access modes based on a credit system.
In this paper, the interference channel with a cognitive relay is exploited to achieve spectrum sharing between a licensed primary user and an unlicensed secondary user.
In this paper, an interference channel with a cognitive relay (IFC-CR) is considered to achieve spectrum sharing between a licensed primary user and an unlicensed secondary user.
More than four bidders could achieve spectrum holdings from the auction when it concludes — indeed all seven bidders could acquire some spectrum — but of that number four bidders would hold enough spectrum to be able to launch a "credible" national 4G network should they choose to.
Since the secondary transmitter utilizes the retransmission of primary packets to achieve spectrum access, the retransmission of the primary packets will fail due to the strong interference from secondary access.
As shown later in this article, the secondary user is able to achieve spectrum access as long as it is willing to increase its transmit power such that is met.
Carrier aggregation (CA) is a promising technology that will allow IMT-Advanced system candidates to achieve spectrum bandwidths of up to 100 MHz using available system resource blocks (RB), even if these are fragmented.
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