Secondary Spectrum Access with LT Codes for Delay-Constrained Applications

Kushwaha, Harikeshwar; Chandramouli, R.

doi:10.1109/ccnc.2007.205

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…We now give a short example to show how the An(i, j) can be used in a realistic case. Erasure correcting codes for opportunistic spectrum access were introduced in [10,11,12] as a solution to recover packets lost in collisions, especially LT codes [13]. Their main property is to allow the recovery of a complete length n codeword provided a sufficient number of bits are correctly (i.e.…”

Section: Applicationmentioning

confidence: 99%

Analytic performance evaluation of opportunistic spectrum access with detection errors

Tortelier¹

2011

Proceedings of the 5th International ICST Conference on Performance Evaluation Methodologies and Tools

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This paper aims at giving some results on the performances of opportunistic spectrum access when taking into account sensing errors: non detection, which is the cause of collisions with a transmitting user, and false alarm, which is a cause of missed opportunity to access the channel. We give the probability An(i, j) of having i collisions and j successful access to the channel within n time slots when the primary user's activity can be described by a two-state On/Off model. Our derivation allows us to take into account aggressive or conservative policy, that is to say the secondary user does not systematically obey the indication of the sensing stage, but with a given probability because the sensing is known to be prone to either false alarm or non detection with high probability.

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Section: Applicationmentioning

confidence: 99%

Analytic performance evaluation of opportunistic spectrum access with detection errors

Tortelier¹

2011

Proceedings of the 5th International ICST Conference on Performance Evaluation Methodologies and Tools

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“…One state is influenced by channel fading and noise but the other is like erasure channel. Thus, erasure code is a good choice for cognitive radio [12]. On the other hand, in cognitive radio network, it is normal to assume that there are no network attackers and the participants involved in the protocols are honest.…”

Section: Introductionmentioning

confidence: 99%

Transmission over Cognitive Radio Channel with Novel Secure LT Code

Hosseini

Falahati²

2013

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With the increasing of communication applications in recent years, the demand for radio spectral resources has increased significantly. Cognitive radio scenario was proposed to improve spectrum efficiency in wireless communication systems. In cognitive radio network, it is essential that control information is sent securely and reliably. Ensuring the trustworthiness of the transmitting of spectrum sensing information is important in the CR networks since spectrum sensing directly affects spectrum management and incumbent coexistence. In this paper, the first secondary link channel model is presented, then a secure LT Code is proposed to be compatible with presented channel model and acquires good QoS. As we may know, LT code overcomes packet loss when the channel of the SU is reclaimed by PU. In the new proposed combined encoding and ciphered block, a LT code matrix is used to generate a symmetric cryptographic key. Thus, less complexity observed in the processing computation. Besides, cryptographic key is not sent over the channel. As a result, an attacker has no way to eavesdrop the key unless he is prepared to consider all possible key combinations. This replaced block supplies secure controlling channel and increases spectrum efficiency too.

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