A Low-Cost Open-Hardware Wideband Multiple-Input–Multiple-Output (MIMO) Wireless Channel Sounder

Maharaj, B. T.; Wallace, Jon W.; Jensen, M.A.; Linde, L.P.

doi:10.1109/tim.2008.919943

Cited by 37 publications

(15 citation statements)

References 8 publications

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“…MIMO SECURITY MEASUREMENTS MIMO measurements were taken on the first floor of the Research I building on the Jacobs University Bremen Campus, consisting mainly of classrooms and laboratories, which is depicted in Figure 4. Measurements were performed with a custom MIMO channel sounder fabricated at Jacobs University that is functionally equivalent to the switched array architecture presented in [7].…”

Section: Information Theoretic Limits and Keymentioning

confidence: 99%

“…Transmit (TX) and receive (RX) employed 8-element monopole antennas equivalent to those in [7]. At TX, the monopoles were attached to a ground plane having a pre-drilled hexagonal grid of holes, and the antenna positions were chosen to form a nearly uniform 8-element circular array (5.7 cm=0.47λ interelement spacing, where λ is the free-space wavelength at 2.55 GHz).…”

Section: Information Theoretic Limits and Keymentioning

confidence: 99%

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Experimental Investigation of MIMO Reciprocal Channel Key Generation

Wallace

Sharma

2010

2010 IEEE International Conference on Communications

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Abstract- I. INTRODUCTIONPhysical layer security is a method for enhancing the security of existing wireless systems and networks by exploiting the random nature of the physical propagation channel, possibly providing perfect information theoretic security in some cases. In reciprocal channel key generation (RCKG), legitimate nodes observe a common fluctuating channel [2] to generate keys that are safe from the eavesdropper (Eve), in contrast to existing physical layer approaches that transmit random information through the channel and distill common randomness at Alice and Bob that is unobservable by Eve [1]. Advantages of RCKG are that perfect secrecy is attained without needing to estimate Eve's channel quality, full channel variability is available for key generation since channel state information (CSI) is never fed back between Alice and Bob, keys can be generated using buffered CSI data in contrast to methods that adapt transmission to the immediate channel state, and existing TDD systems could already support RCKG without any changes to the PHY or MAC.In previous work [5], [6], we derived expressions for the available key bits and those safe from an eavesdropper for MIMO systems with correlated complex Gaussian statistics and presented extensions to existing channel quantization (CQ) that dramatically reduce symbol error rate (SER). In this paper, we build on this foundation to investigate key generation limits and the performance of CQ methods for real LOS and NLOS scenarios based on new MIMO measurements in an indoor environment, revealing the true rate at which key bits can be generated as well as the required eavesdropper separation required for key bits to be secure.

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Section: Information Theoretic Limits and Keymentioning

confidence: 99%

Section: Information Theoretic Limits and Keymentioning

confidence: 99%

Experimental Investigation of MIMO Reciprocal Channel Key Generation

Wallace

Sharma

2010

2010 IEEE International Conference on Communications

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“…A custom MIMO channel sounder fabricated at Jacobs University was employed that is functionally equivalent to the switched array architecture presented in [3], except for two important enhancements: (1) The new system employs custom FPGA-based A/D, allowing the required FFTs to be performed in real-time and channel data to be streamed continuously to disk.…”

Section: Mimo Security Measurementsmentioning

confidence: 99%

“…Channels were measured with 23 dBm transmit power using a multitone signal with N F = 8 tones and 10 MHz separation, centered at 2.55 GHz. Transmit (TX) and receive (RX) employed 8-element monopole antennas equivalent to those in [3]. At TX, antennas formed an 8-element uniform circular array (5.7 cm=0.47λ interelement spacing, where λ is the free-space wavelength at 2.55 GHz), but in our analysis, only 4 of the TX elements are usually considered (a semi-circle of adjacent elements), simulating Alice and Bob with the same number of antennas.…”

Section: Mimo Security Measurementsmentioning

confidence: 99%

Measured statistics of reciprocal channel key generation of indoor MIMO channels

Sharma

Wallace

2010

2010 IEEE Antennas and Propagation Society International Symposium

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“…Production of commercial multi-antenna systems in indoor/outdoor environments' requires full knowledge and understanding of channel conditions, which can only be achieved with in-depth analysis of channel measurement data (Maharaj, Wallace, Jensen, & Linde 2008). In any case, research on multi-antenna architecture performance includes numerous channel characterization works that utilize theoretical and experimental aspects on various radio propagation environments.…”

Section: Introductionmentioning

confidence: 99%

SIMO channel performance evaluation on indoor environment at 2.4 GHz

Votis

Christofilakis

Kostarakis

2015

International Journal of Electronics

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This work presents an experimental study of Single Input Multiple Output (SIMO) channel performance in indoor radio propagation environment. Indoor channel measurements at 2.4 GHz ISM frequency band have been performed using a versatile channel sounder testbed platform. A single transmitting antenna, four receiving antennas with two proposed geometries and a four-branch receiver circuitry were used in order to achieve channel sounder measurements exploiting baseband signal processing techniques. Deep investigation on SIMO wireless channel performance was realized through three types of metrics which are signal strength, gain coefficient and capacity. Performance results indicate SIMO channel capacity enhancement and illustrate differences between the two proposed geometries.

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A Low-Cost Open-Hardware Wideband Multiple-Input–Multiple-Output (MIMO) Wireless Channel Sounder

Cited by 37 publications

References 8 publications

Experimental Investigation of MIMO Reciprocal Channel Key Generation

Experimental Investigation of MIMO Reciprocal Channel Key Generation

Measured statistics of reciprocal channel key generation of indoor MIMO channels

SIMO channel performance evaluation on indoor environment at 2.4 GHz

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