This paper presents interference suppression using a subband adaptive array (SBAA) for uplink space-time block coding (STBC) code division multiple access (CDMA) under a frequency selective fading (FSF) channel. The proposed scheme utilizes CDMA with STBC and a receive array antenna with SBAA processing at the receiver. The received signal is converted into the frequency domain before despreadi...

The nulling of interferences or jammers impinging on a planar antenna array is addressed by means of an efficient adaptive control strategy based on a Genetic Algorithm. Each element of the array is uniformly weighted and the nulling feature is yielded by controlling a set of radiofrequency switches that connect or disconnect the elements from the beam forming network. Under the assumption that...

It is well known that to perform accurate Direction of Arrivals (DOA) estimation using algorithms like MUSIC (MUltiple SIgnals Classification), antenna array data must be calibrated to match the theoretical model upon which DOA algorithms are based. This paper presents experimental measurements from independent sources obtained with a linear antenna array and proposes a novel calibration techni...

This contribution considers adaptive (multiple input multiple output) MIMO-diversity selection at the receiver jointly with closed-loop power control (PC) to efficiently combat fading with only few transmit (Tx) and receive (Rx) antennas. Hence we avoid resalting to antenna selection among large MIMO-arrays without PC which would be otherwise required to keep complexity low. With low Doppler cl...

This paper derives equations that describe level-crossing rates and average fade durations for mobile receivers operating in spatially complicated multipath channels. The results are useful for describing fading statistics for wireless systems that operate in realistic propagation channels or employ smart antennas, adaptive arrays, or other technologies that lead to a non-omnidirectional distri...

A major challenge in using GPS guidance for aircraft final approach and landing is to reject interference that can jam reception of the GPS signals. Antenna arrays, which use space–time adaptive processing (STAP), significantly improve the signal to interference plus noise ratio, but at the possible expense of distorting the received signals, leading to timing biases that may degrade navigation...

Recently, the radio frequency identification (RFID) technology has gained significant attention. One of the important performance issues in RFID systems is to resolve the collision among responses from RFID tags from the viewpoint of wireless media access control. We consider two kinds of smart antenna systems to enhance the RFID tag reading rate, namely the adaptive array antenna and the multi...

It is known that the output performance of a conventional adaptive antenna system is greatly influenced by its antenna array configuration. Such a conclusion holds true to space-time adaptive processing (STAP) systems of mobile communications, where receiving signals consist of the superimposed multipath rays with delay spread and angle spread. It is considered that the associated system perfor...

An adaptive antenna array system adjusts the main lobe of radiation pattern in the direction of desired signal and points the nulls in the direction of undesired signals or interferers. The essential goal of beamforming is to reduce the complexity of weighting process and to decrease the time needed for adjusting the antenna radiation pattern. In this article a new adaptive weighting algorithm ...