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This paper investigates the problem of power allocation for radar network in a cooperative game-theoretic framework such that the low probability of intercept (LPI) performance can be improved. Taking into consideration both the transmit power constraint and the minimum signal-to-interference-plus-noise ratio (SINR) requirement of each radar, a cooperative Nash bargaining power allocation game (NBPAG)...
Third generation mobile communication systems based on the WCDMA air interface employ RAKE reception. Increasing the number of Rake fingers, helps to capture more multipath energy but at the expense of increased receiver complexity. Mobile radio channel measurements at 1945 MHz and 2135 MHz were carried out in Manchester city centre. Statistics of relative power and excess delay of multipath components...
All Orthogonal frequency division multiplexing OFDM, simulators that have been built so far employ a finite impulse response (FIR) tapped delay line filter. A channel simulator for OFDM can also be constructed in the frequency domain using FFT convolution. This paper presents the SIMULINK implementation of a frequency domain channel simulator for OFDM based physical (PHY) layer of Broadband wireless...
The mm wave band is expected to play a major role in future outdoor small cells such as lamp post to user. In this paper we present results of measurements performed in the 60 GHz band in outdoor environments using directional antennas at the transmitter and at the receiver where the receive antenna was rotated in 5° steps to estimate the directional channel parameters. In this paper we present the...
The mm wave band is expected to play a major role in future 5G networks for both indoor access point, and outdoor small cells such as lamp post to user. In this paper we present results of measurements performed in two frequency bands in the mm wave range: 30 GHz and 60 GHz performed indoor and outdoor where the 30 GHz measurements indicate the performance of dual polarized antennas at the transmitter...
Applications of the unlicensed 60 GHz band include indoor wireless local area networks, outdoor short range communications and on body networks. To characterize the radio channel for such applications, a novel digital chirp sounder with programmable bandwidths up to 6 GHz with switched two transmit channels and two parallel receive channels for multiple-input multiple-output (MIMO) measurements was...
A number of frequency bands above 6 GHz have been identified for future 5G networks by both regulators and service providers. The frequency ranges from 10 GHz to 90 GHz offer different availability of contiguous spectrum. To enable the characterization of several of these possible bands a multiband channel sounder is required. This paper presents the architecture of a multiple band channel sounder...
In this paper, results of wideband dual polarised measurements conducted at the science site campus of Durham University in different indoor environments are presented. The measurements were performed in two of the frequency bands in the V band identified by the World Radiocommunication Conference in 2015 (WRC15) using a state of the art 2 by 2 Multiple Input Multiple Output (MIMO) multiband chirp...
Over the last decade, it has been found that the radio spectrum is underutilized in time, frequency and space dimensions or any of their combination. Spectrum occupancy measurements provides a knowledgebase to quantify spectrum utilization and more importantly valuable to define opportunistic spectrum access methods where unused portion of the radio spectrum can be reutilized, to improve utilization,...
The paper discusses the architecture of MIMO channel sounders. The semi-sequential design is contrasted with the sequential and the parallel architectures. Measurements with an eight parallel receiver semi-sequential sounder performed in both indoor and outdoor environments at 2 GHz using different antenna arrays will be presented. The parallel receiver architecture is also shown to provide simultaneous...
Cognitive radios are designed to access unused spectrum opportunistically by limiting interference to primary users in frequency, space or in time dimensions. Finding and accessing spectrum opportunities in the time domain in real environment is very challenging, particularly in the ISM band due to the presence of hopped and short duration signals. In this paper, implementation details of a measuring...
A newly developed multi-band FMCW channel sounder at Durham University was used to perform measurements in the ISM bands in three test beds and on-body measurements in the 60 GHz band. The sounder uses an agile frequency synthesiser to sweep across its bandwidth which enables real time measurements in comparison to the Vector Network Analyser. In this paper we present the estimated rms delay spread...
Over the last decade, the desire for increased data rate and efficient spectrum utilisation in wireless communication systems has evolved the basic single-input single-output (SISO) communication system model into one where multiple antennas are now deployed at both ends of the communication system following the pioneering work of Foschini, Gans and Telatar [1-2]. This system of multiple antennas...
Path loss measurements in indoor and outdoor environments using both narrowband and wideband measurement techniques are reported. Coverage of existing based stations using passive monitoring using a handheld spectrum analyser is reported from spectrum occupancy for different threshold levels.
A multi-band ultra-wideband channel sounder using baseband digital generation techniques in conjunction with heterodyne up-conversion and frequency multiplication to cover the two ISM bands has been developed at Durham University [1]. This paper describes a number of relatively high performance filters which have been developed to provide alias suppression for the sampled digital signal generation...
Previously, the majority of developments in the area of multiple input multiple output (MIMO) technology have been confined to short-range wireless applications operating in the VHF, UHF and SHF bands, with very little research conducted in the lower frequency bands. Recently, several experimental campaigns have been performed over a 255 km radio link between Durham and Leicester in the UK in order...
The feasibility of compact collocated antennas in HF-MIMO systems has been investigated and the results compared with large collocated arrays. The impact of ionospheric conditions on the envelope correlation and MIMO capacity were also analysed. The antenna decorrelation between the receive elements and the corresponding capacity of the system are a function of the type of antenna array used and the...
Work reported herein contributes to the prediction of achievable performance of the IEEE 802.16 standard using time series of 50 Mchps PN channel sounder measurements at 4.9 GHz on radio channels in a scenario in which emergency vehicles are parked outside a building and operate as a centre for communications with rescue crews and equipment inside the building. Predicted error rates are presented...
This paper describes compact antenna arrays for multiple input multiple output MIMO capacity studies in the HF band. These include a three-element receiver array with active electronics to provide broadband non-tuned operation across the entire HF band and a two-channel resonant magnetic loop array for transmitter applications capable of rapid tuning across greater than two octaves. MIMO measurements...
Radio channel measurements in the 2-6 GHz frequency band were performed in two different outdoor environments including the dense urban environment in Manchester and the rural/semi-rural environment of Ipswich. The data were analysed to obtain rms delay spreads for sectored antennas as well as to estimate channel functions for time domain and frequency domain channel simulators of the IEEE802.16-d...
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