On hybrid power allocation scheme for OFDM based cognitive radio

Malik, S.; Banerjee, Adrish

doi:10.1109/ukiwcws.2009.5749410

Cited by 4 publications

(1 citation statement)

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“…In [3], [4], optimal power allocation schemes are proposed to maximize instantaneous transmission rate of SU such that interference caused to PU remains below a threshold. A hybrid approach is considered in [5], where an interference threshold is provided by SU base station from channel state information and power allocation is done by SU depending on actual channel gains but adhering to the threshold provided. In [6], authors propose a power allocation method under average total interference constraint considering a dynamic primary system where PUs can arrive or depart at any time.…”

Section: Introductionmentioning

confidence: 99%

Maximizing sum-outage capacity of OFDM-based cognitive radio under primary user queue stability constraint

Kulkarni

Banerjee

2014

2014 IEEE Wireless Communications and Networking Conference (WCNC)

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We consider a cognitive radio system in which primary user stores packets in a queue for transmission. For proper functioning of primary system, the cognitive user must ensure that primary queue remains stable. We show that such a queue stability constraint can be converted to an equivalent interference constraint on cognitive user's transmission. Under this constraint, we propose a power allocation technique to maximize sum of individual outage capacities achieved on each sub-channel of an OFDM based cognitive user. We present simulation results depicting effect of channel gains of direct links and interference links on primary user's stable throughput and cognitive user's sum-outage capacity. The results show that proposed method performs better than only interweave mode of transmission used in literature.

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Section: Introductionmentioning

confidence: 99%