1

WP3

Progress towards objectives

27/10/2005

2

WP3.1

Communications equipment for trials

The objectives of this work package are: to configure existing platform mm-wave payload equipment for use in the test bed as defined within WP1; to develop mm-wave transceiver units for measurement and customer premises equipment; to providing the correct interfaces to the terminal node equipment.

Completed, trials finished

3

WP3.2

Steerable antenna technologies: EM, RF and mechatronic aspectsThe objective of this work package is to investigate the antenna electromagnetic, RF and mechanical aspects for the mobile mm-wave broadband delivery and put forward solutions for the critical components.

HAP AntennasMulti beam lens antenna: successful EM prototype.236 mm diameter and 35 dBi at 28 GHz : 68 % efficiency

Train AntennasMechanically steered slot fed array antenna designedDouble patch coupled SSFIP antenna was studied for gain improvementSimulation and optimization of 2x2 and 4x4 sub-array were performed. Obtained results:

G = 17.5 dBi, BW = 21.8% for 2x2 sub-arrayG = 22.7 dBi, BW = 19.3% for 4x4 sub-array

Work to start on electronically steered version end of 2005 / start of 2006

mm-wave Amplifier LinearisationGSM Analog lineariser (hiperstable) has been successfully tested. Overcome Offset problems in analog multipliers (four quadrants) Problems with poor carrier rejection in I&Q modulators Digital lineariser: An improved predistorter algorithm capable to consider both dynamic aspects and static distortion of the Power Amplifier has been tested on the DSP bench A number of papers on amplifier linearisation for HAP RF payload

4

WP3.3

Steerable antenna technology: Signal processing aspects

The objectives of this work package are investigation of advanced adaptive beamforming technologies not previously considered to determine the applicability to aerial platform applications and their expected performance within HAP communications scenarios.

Robust Capon beamforming for HAPs, DOA estimation, Kalman tracking and beamforming Evaluation of improved spatial masking filters for HAP cellular coverage with antenna arrays. HAP-train signal processing routines in railway-based scenarios: trains crossing, shadowing/tunnels, and approach into (shadowed) station

To design a vehicular steerable antenna such as might be deployed on a train. To enable communication with an aerial platform anywhere within the coverage area.

Joint beamforming and Doppler compensation for Ground Terminals using Single-Carrier modulationAnalysis of complexity for the implementation of pre-FFT beamforming Adaptive beamforming: Trained and a Decision DirectedDSP implementation of matched filtering and timing recovery for the IEEE 802.16-SC receiver

5

WP3.4

Optical Communication Terminals

The objectives of this work-package are to design, realise and characterise the necessary hardware to demonstrate and carry out channel measurements for a high speed optical backhaul downlink (100 to 622 Mbps) from HAP to ground.

Trial 2 completePreparations for Trial 3

A second objective concentrates on the critical aspect of acquisition and tracking of optical beams during HAP-HAP crosslinks, including HAP station-keeping characteristics.

Evaluation of beam acquisition concepts, supported by system simulation activities on scanning and beam acquisition. Assessment of mechanical disturbance capabilities, check-out of realtime-simulation interfaces (analogue and digital). Integration of testbed items: Optical Head Gimbal connected with telescope flange and rear end optics, including FPA. Integration of Terminal Control Rack.