Blind wiretap channel with delayed CSIT

Lashgari, Sina; Avestimehr, A. Salman

doi:10.1109/isit.2014.6874790

Cited by 16 publications

(15 citation statements)

References 11 publications

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“…An achievable scheme for this model is provided in [6]. It is further shown to be optimal when only linear achievable schemes are admissible, that is, in terms of linear s.d.o.f., in [12]. Theorem 2 strengthens that result by establishing the optimality of Our results illustrate the synergistic benefits of alternating CSIT even with secrecy constraints.…”

Section: Introductionsupporting

confidence: 73%

“…Beyond these results, partial results are available for the three-user MISO BC with hybrid CSIT in [10], [11]. In addition, [12] considers the MISO wiretap channel with delayed CSIT from the legitimate receiver and no CSIT from the eavesdropper (state DN) and shows that 2 . An achievable scheme to achieve 1 2 sum s.d.o.f.…”

Section: Introductionmentioning

confidence: 99%

“…Reference [12] further shows that the optimal linear s.d.o.f. is In this paper, we focus on the MISO BCCM with heterogeneous CSIT.…”

Section: Introductionmentioning

confidence: 99%

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Secrecy for MISO broadcast channels with heterogeneous CSIT

Mukherjee

Tandon

Ulukuş

2015

2015 IEEE International Symposium on Information Theory (ISIT)

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Abstract-We consider the two-user multiple-input singleoutput (MISO) broadcast channel with confidential messages (BCCM), in which the nature of channel state information at the transmitter (CSIT) from each user can be of the form P, D and N, corresponding to perfect and instantaneous, completely delayed, and no CSIT, respectively. We focus on the cases with heterogeneous CSIT from the users, that is, the states PD, PN and DN. The main contribution of this paper is to establish the exact secure degrees of freedom (s.d.o.f.) regions of the MISO BCCM in all of these three heterogeneous states. The results highlight the impact of availability of CSIT on the s.d.o.f. region.

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Section: Introductionsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

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Secrecy for MISO broadcast channels with heterogeneous CSIT

Mukherjee

Tandon

Ulukuş

2015

2015 IEEE International Symposium on Information Theory (ISIT)

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“…for the inputoutput relation stated in (13). To see this, we use [7, Lemma 1], which we state here for completeness.…”

Section: A Linear Secure Degrees Of Freedom Perspectivementioning

confidence: 99%

“…In order to further investigate the optimality of 1 2 (2N − K) as the sum s.d.o.f. for the MAC-WT channel in the regime N ≤ K ≤ 2N , we then restrict ourselves to linear encoding strategies [12,13], where the channel input of each antenna in every time slot is restricted to be a linear combination of some information symbols intended for the legitimate receiver and some artificial noise symbols to provide secrecy at the eavesdropper. We show that under this restriction to linear encoding schemes, the linear sum s.d.o.f.…”

Section: Introductionmentioning

confidence: 99%

Secrecy in MIMO Networks with No Eavesdropper CSIT

Mukherjee

Ulukuş

2017

IEEE Trans. Commun.

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We consider two fundamental multi-user channel models: the multiple-input multipleoutput (MIMO) wiretap channel with one helper (WTH) and the MIMO multiple access wiretap channel (MAC-WT). In each case, the eavesdropper has K antennas while the remaining terminals have N antennas each. We consider a fast fading channel where the channel state information (CSI) of the legitimate receiver is available at the transmitters but no channel state information at the transmitters (CSIT) is available for the eavesdropper's channel. We determine the optimal sum secure degrees of freedom (s.d.o.f.) for each channel model for the regime K ≤ N , and show that in this regime, the MAC-WT channel reduces to the WTH in the absence of eavesdropper CSIT. For the regime N ≤ K ≤ 2N , we obtain the optimal linear s.d.o.f., and show that the MAC-WT channel and the WTH have the same optimal s.d.o.f. when restricted to linear encoding strategies. In the absence of any such restrictions, we provide an upper bound for the sum s.d.o.f. of the MAC-WT chanel in the regime N ≤ K ≤ 2N . Our results show that unlike in the single-input single-output (SISO) case, there is loss of s.d.o.f. for even the WTH due to lack of eavesdropper CSIT when K ≥ N .

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