Software radio or software defined radio (SDR) is a quite attractive field of research in terms of theoretical crossover research themes between radio engineering and computer science in academia as well as new multi-standard or all-purpose radio system products in industry [1], [2]. In order to promote research and development in a field of SDR this paper briefly introduces some prospective as...

Wireless ad hoc networks have traditionally been assumed to use omni-directional antennas. However, it has been recently recognized that the use of advanced antenna technologies could help alleviate the capacity limitations of multi-hop wireless networks, stemming from interference generated in the shared medium [1]. Adaptive array antennas have the ability to automatically respond to an unknow...

A direct data-domain (D3) least-squares space-time adaptive-processing (STAP) approach is presented for adaptively enhancing signals in a non-homogeneous environment of jammers, clutter, and thermal noise, utilizing a circular antenna array. The non-homogeneous environment may consist of non-stationary clutter. The D3 approach is applied directly to the data collected by a circular antenna arra...

In this letter, an approach to adaptive antenna array optimisation based on genetic algorithms is assessed in a realistic scattering environment, where interfering signals are modelled using the Student’s t-distribution. Simulation results demonstrate the effectiveness of the proposed array control strategy.

A 60 GHz-band four-element integrated planar phased array is proposed. Each antenna element is integrated with evenharmonic I/Q mixer compromised of anti-parallel diode pairs (APDPs) for the adaptive beamforming systems.

Adaptive switching between multiple-input multiple-output (MIMO) transmission schemes like diversity and spatial multiplexing yields significantly higher capacity gains over fixed transmission schemes. Previous work has shown the impact of channel correlation and SNR on the switching between different schemes like beamforming and spatial multiplexing. This paper explores the influence of antenn...

It is shown that FRESH (frequency-shift) filtering prior to Viterbi demodulation in GSM basestations and/or handsets can multiply the number of cochannel signals that can be separated with M antennas by (2M-1)/(M-1): suppression of 1 interferer with one antenna, 3 interferers with a diversity antenna pair, and 2M1 interferers with M antennas. The network-level simulations reported in this paper...

Frequency domain adaptive antenna array (FDAAA) is an effective method to suppress interference caused by frequency selective fading and multiple-access interference (MAI) in single-carrier (SC) transmission. However, the performance of FDAAA receiver will be affected by the antenna placement parameters such as antenna separation and spread of angle of arrival (AOA). On the other hand, hybrid f...

This paper presents a low-cost compact planar microstrip-fed monopole antenna and its four-element array design for ultra-wideband (UWB) wireless communication and target detection applications, respectively, operating in the frequency span of 3 GHz to 11 GHz. A prototype was fabricated and then measured based on optimal parameters. The results of reflection coefficient (S11) and radiation patt...