Papers by Akinbiyi Akindoyin
2014 IEEE 8th Sensor Array and Multichannel Signal Processing Workshop (SAM), 2014
ABSTRACT The emergence of software defined radio (SDR) aims to increase flexibility as well as re... more ABSTRACT The emergence of software defined radio (SDR) aims to increase flexibility as well as reduce cost, size, weight and power (SWAP) inherent in traditional hardware radios. This paper is concerned with addressing issues associated with the formation of an array system from multiple SDR boards where each has an independent local oscillators (LO) in a multi-antenna system using representative examples such as localization and array shape estimation. In particular, practical experimental results are initially presented for estimating the unknown location of a single source using an SDR array of known array geometry. Furthermore, in the case that the SDR array geometry is unknown, a novel array shape estimation algorithm is proposed. The proposed algorithm estimates the antenna locations without requiring any external sources. This is achieved by allowing the array elements operate as transceivers.
2015 IEEE International Conference on Communications (ICC), 2015
This paper is concerned with the modelling and estimation of frequency and phase carrier uncertai... more This paper is concerned with the modelling and estimation of frequency and phase carrier uncertainties in an array system where its elements are distributed over a large area and consequently forming large aperture arrays with massive inter-element spacings. In this situation, it is practically impossible to have a common carrier (common local oscillator-LO) in order to form a fully coherent array system, as in the case of small aperture arrays where the array elements are in the vicinity of each other. Instead, each of the receiving array elements has its own independent carrier which will have slightly different frequencies and phases, even if the local oscillators are using similar hardware or even if each local oscillator is using a GPS reference clock for locking. These discrepancies will introduce frequency and phase uncertainties in the array which must be removed to achieve a coherent array system. In this paper, these uncertainties are mathematically modelled, their effect on the performance of an array system is examined and a simple method is proposed to estimate and eliminate these uncertainties. This work is supported by computer simulation studies and experimental results using a software defined radio (SDR) array testbed.
2015 IEEE Globecom Workshops (GC Wkshps), 2015
In upcoming trends of wireless communications, such as massive MIMO, the number of antennas at th... more In upcoming trends of wireless communications, such as massive MIMO, the number of antennas at the transmitter (TX) and receiver (RX) are expected to increase dramatically, aiming to provide a substantial improvement in system performance and spectral efficiency. However, an increase in the number of antennas also results in an increase in hardware, computational complexity and energy dissipation of the MIMO system. Therefore, the antenna array geometry plays a crucial role in the overall system performance. This paper is concerned with planar antenna array geometries with emphasis given to the family of 2D "grid" arrays and presents an insight into the relation between the array geometry and various performance metrics, such as detection, resolution and data-rate maximization, that may be used in different applications.
In upcoming trends of wireless communications,
such as massive MIMO, the number of antennas at th... more In upcoming trends of wireless communications,
such as massive MIMO, the number of antennas at the transmitter (TX) and receiver (RX) are expected to increase dramatically, allowing a substantial improvement in system performance and spectral efficiency. However, an increase in the number of antennas, also results in an increase in hardware, computational complexity and energy dissipation of the MIMO system. Hence, an intelligent utilisation of the array elements is crucial. To this end, this paper presents an insight into the relation between the array geometry and various performance metrics, such as detection, resolution and data-rate maximization. Based on the requirements of each performance metric, a suitable selection of the array geometry that provides an optimum trade-off between the objective of the task and constraints imposed by the system
is proposed.
This paper is concerned with the modelling and
estimation of frequency and phase carrier uncertai... more This paper is concerned with the modelling and
estimation of frequency and phase carrier uncertainties in
an array system where its elements are distributed over a
large area and consequently forming large aperture arrays
with massive inter-element spacings. In this situation, it is
practically impossible to have a common carrier (common
local oscillator - LO) in order to form a fully coherent
array system, as in the case of small aperture arrays
where the array elements are in the vicinity of each other.
Instead, each of the receiving array elements has its own
independent carrier which will have slightly different fre-
quencies and phases, even if the local oscillators are using
similar hardware or even if each local oscillator is using a
GPS reference clock for locking. These discrepancies will
introduce frequency and phase uncertainties in the array
which must be removed to achieve a coherent array system.
In this paper, these uncertainties are mathematically mod-
elled, their effect on the performance of an array system
is examined and a simple method is proposed to estimate
and eliminate these uncertainties. This work is supported
by computer simulation studies and experimental results
using a software defined radio (SDR) array testbed.
This research work has investigated the physical layer security of both MISO and OFDM-MIMO commun... more This research work has investigated the physical layer security of both MISO and OFDM-MIMO communication systems. This project explored the use of beamforming and artificial noise generation as transmit strategy to achieve secure communication. In the MISO system, a probabilistic approach for achieving secrecy was studied. This method ensures a target probability of secrecy characterised by QoS constraint at the eavesdropper and the legitimate receiver. Further, this research work considers the optimum power allocation strategy between the information signal and artificial noise. Results from MATLAB simulation show that this scheme achieves the target probability of secrecy by allocating the minimum power for both constrained and unconstrained transmit power scenarios. It was established that for
The emergence of software defined radio (SDR) aims to increase flexibility as well as reduce cost... more The emergence of software defined radio (SDR) aims to increase flexibility as well as reduce cost, size, weight and power (SWAP) inherent in traditional hardware radios. This paper is concerned with addressing issues associated with the use of cheap multi-SDR with independent local oscillator (LO) in a multi-antenna system using representative examples such as localization and array shape estimation. In particular, practical experimental results are initially presented for estimating the unknown source location using an SDR array of known array geometry. Furthermore, in the case that the SDR array geometry is unknown, an array shape estimation algorithm is proposed. The proposed algorithm estimates the antenna locations without requiring any external sources either a pilot or source of opportunity.
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Papers by Akinbiyi Akindoyin
such as massive MIMO, the number of antennas at the transmitter (TX) and receiver (RX) are expected to increase dramatically, allowing a substantial improvement in system performance and spectral efficiency. However, an increase in the number of antennas, also results in an increase in hardware, computational complexity and energy dissipation of the MIMO system. Hence, an intelligent utilisation of the array elements is crucial. To this end, this paper presents an insight into the relation between the array geometry and various performance metrics, such as detection, resolution and data-rate maximization. Based on the requirements of each performance metric, a suitable selection of the array geometry that provides an optimum trade-off between the objective of the task and constraints imposed by the system
is proposed.
estimation of frequency and phase carrier uncertainties in
an array system where its elements are distributed over a
large area and consequently forming large aperture arrays
with massive inter-element spacings. In this situation, it is
practically impossible to have a common carrier (common
local oscillator - LO) in order to form a fully coherent
array system, as in the case of small aperture arrays
where the array elements are in the vicinity of each other.
Instead, each of the receiving array elements has its own
independent carrier which will have slightly different fre-
quencies and phases, even if the local oscillators are using
similar hardware or even if each local oscillator is using a
GPS reference clock for locking. These discrepancies will
introduce frequency and phase uncertainties in the array
which must be removed to achieve a coherent array system.
In this paper, these uncertainties are mathematically mod-
elled, their effect on the performance of an array system
is examined and a simple method is proposed to estimate
and eliminate these uncertainties. This work is supported
by computer simulation studies and experimental results
using a software defined radio (SDR) array testbed.
such as massive MIMO, the number of antennas at the transmitter (TX) and receiver (RX) are expected to increase dramatically, allowing a substantial improvement in system performance and spectral efficiency. However, an increase in the number of antennas, also results in an increase in hardware, computational complexity and energy dissipation of the MIMO system. Hence, an intelligent utilisation of the array elements is crucial. To this end, this paper presents an insight into the relation between the array geometry and various performance metrics, such as detection, resolution and data-rate maximization. Based on the requirements of each performance metric, a suitable selection of the array geometry that provides an optimum trade-off between the objective of the task and constraints imposed by the system
is proposed.
estimation of frequency and phase carrier uncertainties in
an array system where its elements are distributed over a
large area and consequently forming large aperture arrays
with massive inter-element spacings. In this situation, it is
practically impossible to have a common carrier (common
local oscillator - LO) in order to form a fully coherent
array system, as in the case of small aperture arrays
where the array elements are in the vicinity of each other.
Instead, each of the receiving array elements has its own
independent carrier which will have slightly different fre-
quencies and phases, even if the local oscillators are using
similar hardware or even if each local oscillator is using a
GPS reference clock for locking. These discrepancies will
introduce frequency and phase uncertainties in the array
which must be removed to achieve a coherent array system.
In this paper, these uncertainties are mathematically mod-
elled, their effect on the performance of an array system
is examined and a simple method is proposed to estimate
and eliminate these uncertainties. This work is supported
by computer simulation studies and experimental results
using a software defined radio (SDR) array testbed.