Beamforming and Bit-loading Strategies for Multi-User SDMA with Admission Control

Konferenz: PIMRC 2005 - 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications
11.09.2005 - 14.09.2005 in Berlin, Germany

Tagungsband: PIMRC 2005

Seiten: 5Sprache: EnglischTyp: PDF

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Bengtsson, Mats (Signal Processing, S3, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden)
Bartolomé, Diego (Gedas Iberia, Zona Franca, sector A, calle 2, no1, 08040 Barcelona, Spain)
Vicario, José López; Antón-Haro, Carles (Centre Tecnològic de Telecom. de Catalunya (CTTC), c/ Gran Capità 2-4, Planta 2, 08034 Barcelona, Spain)

In this paper, we address the problem of transmit beamforming, power allocation, bit loading, and admission control in a multi-user scenario, where several single antenna mobile terminals are served by one base station equipped with an antenna array. In particular, we explore the impact of using either optimal or zero-forcing transmit beamforming schemes in combination with different bit allocation strategies, namely the Maximization of the Sum Rate (MSR), the Maximization of the Minimum Rate (MMR) and a modified version of the latter, for a finite set of modulation schemes. The performance evaluation is conducted by means of system-level simulations, using a realistic channel model for urban micro cells, with an emphasis not only on the aggregated cell throughput but also on the associated fairness issues.