Improvement of multiple antennas diversity systems through receiver nonlinear coupling cancellation

Arambasic, Igor; Quirós, Francisco Javier Casajús; Raos, I.

doi:10.1109/wddc.2007.4339389

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…Low-order polynomials tend to be smooth and high order polynomial curves like the one of the ninth degree, tend to be "lumpy" with several local minimum and maximums making the surface approximation severe. Having in mind that complex curves can be formed without higher order multiplications, a model based on a sum of two independent higher order polynomials with one simple linear multiplication is proposed in [3]:…”

Section: Mathematical Surface Modelmentioning

confidence: 99%

Simulated Quenching for Cancellation of Non-Linear Multi-Antennas Coupling

Arambasic¹,

Quiros²,

Raos³

2012

Simulated Annealing - Single and Multiple Objective Problems

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Section: Mathematical Surface Modelmentioning

confidence: 99%

Simulated Quenching for Cancellation of Non-Linear Multi-Antennas Coupling

Arambasic¹,

Quiros²,

Raos³

2012

Simulated Annealing - Single and Multiple Objective Problems

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“…[ 8,9,10]. Nevertheless, when analyzing multi antenna system those models are not sufficient and coupling has to be taken into account [11]. However, this phenomenon has not been analysed thoroughly by scientific research community.…”

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confidence: 99%

Efficient RF Front-End Non-Linear Multi Antenna Coupling Cancellation Techniques

Arambasic

Quirós

Raos

2007

2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications

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One of the recent trends in mobile communication industry is the use of multiple antennas in transmitter and at the receiver in order to gain diversity and achieve high bit rates. At the same time, as the mobile terminals are getting smaller, the number of electronic elements squeezed inside of them increases. Inside this hostile environment the coupling, which can considerably alter the overall system performance, is bound to emerge.To combat the multi antenna RF front-end coupling a DSP software module, positioned between the output of AD converter and any further digital signal processing is proposed. The coupling is modelled with polynomials limited to third order nonlinear behaviour. The inverse nonlinear coupling function of the 9 th degree is solved using simulated annealing (SA) approximation method. The proposed coupling cancellation algorithm is analyzed under different system conditions with different processing power requirements. A trade off between the guaranteed precision and speed is made, and the simplified algorithm version, showing good coupling cancellation characteristics, is presented.

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“…In previous The purpose of mobile terminals changed drastically over contribution coupling is analyzed with the emphasis on the last few years. What once was used just for voice approximation precision [7]. The Simulated Annealing (SA) communication is nowadays being used as video camera, class of methods was proposed as SA can statistically radio-television set, mp3 player, video game platform etc.…”

mentioning

confidence: 99%

Receiver's Multi-Antenna Coupling Cancellation Based on Guided Multi-level Search

Arambasic

Quirós

Raos

2007

2007 IEEE International Symposium on Intelligent Signal Processing

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In order to achieve higher bit rates and gain diversity, trends in mobile communication industry include the use of recent trends in communication industry include the use of multiple antennas in transmitter and at the receiver [3,4,5]. multiple antennas in transmitter and at the receiver. At the At the same time, the mobile terminals minimization is being same time the terminals are getting smaller incrementing the emphasized leaving less space to increased number of level of electronic interferences in their interior. In this electronic elements. The closeness of data metallic wires and contribution, the signal distortion known as RF front-end antenna coupling is analyzed. The coupling between antennas is m anylecroice c ts leatoiferen distortincs ta n modeled with polynomials limited to third order nonlinear significantly reduce the entire system performances [6].behavior. Nonlinear software decoupling module, located at the Nevertheless these imperfections are still not analyzed output of analog-to-digital (AD) converter, is proposed for thoroughly by scientific research community. coupling cancellation. Inside the module, signal enhancement is In this contribution a proposal how to model and overcome achieved with the approximation of inverse nonlinear coupling the multi antenna RF front end coupling distortions is function with the polynomial of gth degree. The inverse function presented and analyzed. The coupling is modeled with is obtained using guided multilevel search approximation polynomials limited to third order nonlinear behavior.method. The proposed coupling cancellation algorithm is

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Improvement of multiple antennas diversity systems through receiver nonlinear coupling cancellation

Cited by 4 publications

References 7 publications

Simulated Quenching for Cancellation of Non-Linear Multi-Antennas Coupling

Simulated Quenching for Cancellation of Non-Linear Multi-Antennas Coupling

Efficient RF Front-End Non-Linear Multi Antenna Coupling Cancellation Techniques

Receiver's Multi-Antenna Coupling Cancellation Based on Guided Multi-level Search

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