TY - GEN
T1 - Optimal joint power allocation and phase control for DS-CDMA cognitive radio networks
AU - Safavi, S. Ebrahim
AU - Subbalakshmi, K. P.
PY - 2011
Y1 - 2011
N2 - Efficient and fair resource allocation in cognitive radio (CR) networks under strict constraints imposed by the primary network is a challenging problem for underlay dynamic spectrum access (DSA) networks. Due to the distributed nature of secondary networks, traditional approaches are usually computationally inefficient in providing fair resource management while meeting severe constraints imposed by the primary network. In this paper we consider the scenario of homogeneous CDMA-based DSA network with one main primary receive-transmit pair and an arbitrary number of secondary users (SUs). Unlike the prior works, we consider the case where SUs can adaptively adjust their transmit directions besides transmit power according to available channel information. For such a scenario, we formulate the joint power allocation and phase control problem and find the optimal solution to maximize the total rate for the secondary network subject to interference and power constraints. Our method has a linear computational complexity and guarantees fairness among SUs. Numerical analysis show that introducing the phase control alleviates the restriction of strict interference constraint while keeping the efficiency of power allocation.
AB - Efficient and fair resource allocation in cognitive radio (CR) networks under strict constraints imposed by the primary network is a challenging problem for underlay dynamic spectrum access (DSA) networks. Due to the distributed nature of secondary networks, traditional approaches are usually computationally inefficient in providing fair resource management while meeting severe constraints imposed by the primary network. In this paper we consider the scenario of homogeneous CDMA-based DSA network with one main primary receive-transmit pair and an arbitrary number of secondary users (SUs). Unlike the prior works, we consider the case where SUs can adaptively adjust their transmit directions besides transmit power according to available channel information. For such a scenario, we formulate the joint power allocation and phase control problem and find the optimal solution to maximize the total rate for the secondary network subject to interference and power constraints. Our method has a linear computational complexity and guarantees fairness among SUs. Numerical analysis show that introducing the phase control alleviates the restriction of strict interference constraint while keeping the efficiency of power allocation.
KW - Power Allocation and Phase Control
KW - Rate Optimization
KW - Underlay Dynamic Spectrum Access
UR - http://www.scopus.com/inward/record.url?scp=84857213893&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84857213893&partnerID=8YFLogxK
U2 - 10.1109/GLOCOM.2011.6134416
DO - 10.1109/GLOCOM.2011.6134416
M3 - Conference contribution
AN - SCOPUS:84857213893
SN - 9781424492688
T3 - GLOBECOM - IEEE Global Telecommunications Conference
BT - 2011 IEEE Global Telecommunications Conference, GLOBECOM 2011
T2 - 54th Annual IEEE Global Telecommunications Conference: "Energizing Global Communications", GLOBECOM 2011
Y2 - 5 December 2011 through 9 December 2011
ER -