Exact(60)
Intercell interference emerges as the key limiting factor, restricting the reusability of the spectral resources.
CR is a highly promising wireless technology which can mitigate the scarcity of spectral resources.
LTE is an OFDM system where spectral resources are divided in both time and frequency.
In split B, the mapping of data symbols to spectral resources is done at the RU.
CDMA systems require bandwidth expansion, which requires greater spectral resources, and also introduces frequency-selective fading.
Time-delay estimation is studied for cognitive radio systems, which facilitate opportunistic use of spectral resources.
Cognitive MAC protocols are designed to efficiently utilize the scarce spectral resources without affecting the performance characteristics of primary users.
The remaining power and spectral resources are distributed among the remaining users for transmissions of new packets.
The idle cellular users have no data to transmit, and the spectral resources allocated to them can be reused.
Lu et al. [18] utilized a layered coalitional game to select the relays and allocate spectral resources.
Hence, the proposed QoS-DFFR scheme exploits limited spectral resources more efficiently and thus reduces the blocking probability of users.
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