System parameter selection for asymmetric underlay CDMA networks with interference-minimizing code asssignment

Kashef, Mohamed; Abdallah, Mohamed; Elezabi, Ayman; Khairy, Mohamed M.

doi:10.1109/spawc.2009.5161880

Cited by 7 publications

(8 citation statements)

References 4 publications

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“…The secondary code set of multiple secondary users was also constructed in an iterative way. Under interference-minimizing code assignments, bit rate and spreading factor adjustments for a secondary CDMA system were considered in [16]. A distributed algorithm for resource allocation of spectral bands, power, and data rates among multiple secondary users for multi-carrier CDMA systems was developed in [17].…”

Section: B Related Workmentioning

confidence: 99%

Cognitive Jointly Optimal Code-Division Channelization and Routing Over Cooperative Links

Pados¹,

Melodia²,

Batalama³

2014

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Section: B Related Workmentioning

confidence: 99%

Cognitive Jointly Optimal Code-Division Channelization and Routing Over Cooperative Links

Pados¹,

Melodia²,

Batalama³

2014

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“…However, in our assumed coexistence mode of operation, the secondary network cannot obtain such knowledge directly from primary networks. Therefore, before starting to solve the channelization problem in (10), (11), the secondary network needs to blindly detect (i) the number of active primary users and (ii) their binary signatures s , = 1, . .…”

Section: System Model and Problem Formulationmentioning

confidence: 99%

“…Cooperation-mode bit rate and spreading factor adjustments for a secondary CDMA system under interference-minimizing code assignments were carried out in [11]. In [12], [13], a secondary maximum signalto-interference-plus-noise ratio (SINR) code-division link is designed subject to SINR requirements for the primary system which is presumed known (cooperation-mode cognitive radio).…”

mentioning

confidence: 99%

Cognitive Code-Division Links with Blind Primary-System Identification

Batalama

Pados

et al. 2011

IEEE Trans. Wireless Commun.

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Abstract-We consider the problem of cognitive code-division channelization (simultaneous power and code-channel allocation) for secondary transmission links co-existing with an unknown primary code-division multiple-access (CDMA) system. We first develop a blind primary-user identification scheme to detect the binary code sequences (signatures) utilized by primary users. To create a secondary link we propose two alternative procedures -one of moderate and one of low computational complexity-that optimize the secondary transmitting power and binary codechannel assignment in accordance with the detected primary code channels to avoid "harmful" interference. At the same time, the optimization procedures guarantee that the signalto-interference-plus-noise ratio (SINR) at the output of the maximum SINR linear secondary receiver is no less than a certain threshold to meet secondary transmission quality of service (QoS) requirements. The extension of the channelization problem to multiple secondary links is also investigated. Simulation studies presented herein illustrate the theoretical developments.Index Terms-Blind user identification, code-channel allocation, code-division multiple-access, cognitive radio, dynamic spectrum access, power allocation, signal-to-interference-plusnoise ratio.

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“…Secondary code set of multiple secondary users was also constructed in an iterative way. Under interference-minimizing code assignments, bit rate and spreading factor adjustments for a secondary CDMA system were considered in [20]. A distributed algorithm for resource allocation of spectral bands, power, and data rates among multiple secondary users for multi-carrier CDMA systems was developed in [21].…”

Section: Related Workmentioning

confidence: 99%

Spread-spectrum cognitive networking: Distributed channelization and routing

Gao

Ding

Melodia

et al. 2011

2011 - MILCOM 2011 Military Communications Conference

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Abstract-We study a framework that captures the interdependencies between spreading channelization and routing for a secondary multi-hop cognitive radio network that operates cognitively to coexist with primary users. We consider interactions between dynamic routing and code-division channelization functionalities for cognitive radio networks. With this respect, we study the effect of joint routing, spreading code and power allocation on the network throughput. A solution for joint routing and spread-spectrum channelization is proposed as a localized approximation of the throughput-maximizing problem. Specifically, power and spreading code are allocated to guarantee the quality of service of the on-going primary and secondary transmissions, while the routing algorithm dynamically selects relays based on the network traffic dynamics and on the achievable data rates on different secondary links.

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System parameter selection for asymmetric underlay CDMA networks with interference-minimizing code asssignment

Cited by 7 publications

References 4 publications

Cognitive Jointly Optimal Code-Division Channelization and Routing Over Cooperative Links

Cognitive Jointly Optimal Code-Division Channelization and Routing Over Cooperative Links

Cognitive Code-Division Links with Blind Primary-System Identification

Spread-spectrum cognitive networking: Distributed channelization and routing

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