Download Signal Processing Approaches to Secure Physical Layer by Y.-W. Peter Hong, Pang-Chang Lan, C.-C. Jay Kuo PDF

By Y.-W. Peter Hong, Pang-Chang Lan, C.-C. Jay Kuo

This publication introduces a number of sign processing methods to reinforce actual layer secrecy in multi-antenna instant platforms. instant actual layer secrecy has attracted a lot awareness in recent times end result of the broadcast nature of the instant medium and its inherent vulnerability to eavesdropping. whereas such a lot articles on actual layer secrecy specialize in the information-theoretic element, we concentration particularly at the sign processing facets, together with beamforming and precoding thoughts for info transmission and discriminatory education schemes for channel estimation. The discussions will conceal situations with collocated and with allotted antennas, i.e., relays. the themes lined can be of curiosity to researchers within the sign processing group in addition to practitioners and engineers operating during this quarter. This e-book also will overview fresh works that practice those sign processing methods to extra complex instant platforms, similar to OFDM platforms, multicell platforms, cognitive radio, multihop networks and so forth. this can draw curiosity from researchers that desire to pursue the subject additional in those new instructions.
This publication is split into 3 elements: (i) information transmission, (ii) channel estimation and (iii) complicated purposes. although many works exist within the literature on those subject matters, the ways and views taken have been mostly diversified. This e-book offers a extra geared up and systematic view of those designs and to put a high-quality beginning for destiny paintings in those components. additionally, by means of proposing the paintings from a sign processing point of view, this publication also will set off extra examine curiosity from the sign processing neighborhood and additional improve the sphere of actual layer secrecy alongside the defined instructions.
This booklet permits readers to achieve easy figuring out of works on actual layer secrecy, wisdom of ways sign processing concepts might be utilized to this quarter, and the appliance of those thoughts in complicated instant applications.

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Extra resources for Signal Processing Approaches to Secure Physical Layer Communications in Multi-Antenna Wireless Systems

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58) decreases and, thus, the achievable secrecy rate is increased. ¯ s . 59) can be written as 1)σa2 = P. ⎛ det ⎝In e hH P¯ + He d ns hd hH hd P¯ HeH In e + He In s − d hd ns hd = det In e hH P¯ P¯ + He HeH det In e + He In s − d ns ns hd = det In s P¯ P¯ P¯ hdH + HeH He det In s + HeH He − ns ns n s hd = det In s P¯ hdH − n s hd = hd hd In s hd P¯ HeH He In s + HeH He hd ns P¯ + HeH He ns −1 −1 hd hd ⎞ ⎠ HeH −1 hd hd HeH hd HeH He hd −1 −1 −1 −1 hdH hd . 61) where λmax (A, B) denotes the maximum generalized eigenvalue of the matrix pair ¯ s is large), the achievable (A, B).

3 An illustration of secrecy beamforming with artificial noise of the information-bearing signal to disrupt the reception at the eavesdropper, as depicted in Fig. 3. This approach was first proposed in [29, 30] and is often used when the eavesdropper CSI is not perfectly known at the source since, in this case, the signals cannot be accurately placed in dimensions that are less favorable to the eavesdropper. Recall that, if perfect knowledge of both the destination and the eavesdropper CSI is available at the source, it is optimal to transmit signals in subchannels corresponding to the maximum generalized eigenvalue of the channel (cf.

5) increases monotonically with p f , when Hd f˜ 2 ≥ He f˜ 2 , and decreases monotonically, otherwise. Hence, the secrecy rate can be maximized by choosing p f = P¯ if there exists f˜ such that Hd f˜ 2 ≥ He f˜ 2 and by choosing p f = 0, otherwise. As a result, the achievable secrecy rate can be expressed as Rs,BF 1 + P¯ Hd f˜ = max log ˜ f˜ 2 =1 1 + P¯ He f˜ f: 2 2 + = max log ˜ f˜ f: 2 =1 H ¯ H Hd )f˜ f˜ (In s + PH d H ¯ eH He )f˜ f˜ (In s + PH + . 6) From the above, the optimal beamforming direction f˜ can be found by maximizing ¯ eH He is positive definite, there exists the ratio inside the logarithm.

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