PHY3

  • Wednesday, 14 June, 11:00-12:30, Room Library Auditorium
  • Session Chair: Umberto Spagnolini (Politecnico di Milano, Italy)

 

 

11:00 An Adaptive Parametric Prediction Method for Mobile MIMO Wireless Systems

Ramoni O. Adeogun (University of Cape Town, South Africa & National Space Research and Development Agency, Nigeria); Paul D Teal and Pawel A. Dmochowski (Victoria University of Wellington, New Zealand)

In this paper, we investigate the prediction of mobile MIMO channels with varying multipath parameters. Based on the PAST algorithm, we propose a multidimensional adaptive ESPRIT approach for jointly tracking the evolution of the Doppler frequencies and spatial directions of arrival and departure of the propagation paths. Future states of the channel are predicted using the last estimate of the propagation parameters. We show via simulation that the proposed adaptive method outperforms existing static approaches with varying channel parameters. Our results indicate that the performance improvement from parameter tracking is dependent on the rate of variation of the underlying multipath parameters.

 

11:18 Silicon Area of FBMC Receivers for CMOS 65nm and Comparison to OFDM Receivers

Vincent Berg (CEA LETI, France); Jean-Baptiste Doré (CEA, France); Sylvie Mayrargue (CEA-LETI, France)

New waveforms are considered by the fifth generation (5G) of cellular networks to exploit the underutilized fragmented spectrum. FBMC is one possibility as it provides better adjacent channel leakage. This paper brings a first estimate of silicon area for FBMC in comparison to OFDM assuming a CMOS 65nm technology. The paper concludes that the silicon area overhead introduced by much more complex waveforms is deemed acceptable.

 

11:36 ASIP Design for Multiuser MIMO Broadcast Precoding

Shahriar Shahabuddin (Centre for Wireless Communications, University of Oulu, Finland); Olli Silvén and Markku Juntti (University of Oulu, Finland)

This paper presents an application-specific instruction-set processor (ASIP) for multiuser multiple-input multiple-output (MU-MIMO) broadcast precoding. The ASIP is designed for a base station (BS) with four antennas to perform user scheduling and precoding. Transport triggered architecture (TTA) is used as the processor template and high level language is used to program the ASIP. Several special function units (SFU) are designed to accelerate norm-based greedy user scheduling and minimum-mean square error (MMSE) precoding. We also program zero forcing dirty paper coding (ZF-DPC) to demonstrate the reusability of the ASIP. A single core provides a throughput of 52.17 Mbps for MMSE precoding and takes an area of 87.53 kgates at 200 MHz on 90 nm technology.

 

11:54 Dual-Polarized 2x2 Element Sub-Array at 15 GHz with High Port Isolation

Marko Sonkki and Sami Myllymäki (University of Oulu, Finland); Jussi Putaala and Maciej Sobocinski (Microelectronics Research Unit, University of Oulu, Finland); Aarno Pärssinen (University of Oulu, Finland); Eero Heikkinen, Tomi Haapala and Kari Nikkanen (Nokia Networks, Finland)

This paper presents simulation results of a dual-polarized 2x2 element sub-array antenna element at 15 GHz center frequency. The basic idea is to use two waveguides one on the other to excite the orthogonal polarizations by using radiating slots. Above the slots, 4 parasitic patches are set to a form of 2x2 element sub-array. Antenna presents -10 dB impedance bandwidth from 14.3 to 15.6 GHz with better than 68 dB isolation between the excitation ports. At the aforementioned bandwidth, the total efficiency is better than 0.7 dB (> 85%). Antenna shows very good polarization properties and difference between ϕ, θ components is greater than 45 dB. Also the radiation patterns and surface current distributions at 15 GHz center frequency are presented and compared.

 

12:12 Pilot Structure Design to Increase Wireless Channel Capacity for High-Speed Railway

Yongyun Choi and Jae Hong Lee (Seoul National University, Korea)

In this paper, we design a pilot structure in an orthogonal frequency division multiplexing (OFDM) system for high-speed railway (HSR). Ergodic capacity is derived and lower bound of the ergodic capacity is obtained in analytic expression by using Jensen's inequality. A pilot structure design problem is formulated and new pilot placement schemes are proposed to maximize the lower bound of the ergodic capacity. Simulation results show that the proposed schemes achieve higher ergodic capacity than that of the random pilot placement scheme.