Olli Piirainen

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A three-dimensional (3D) multi-cell multi-user system model along with spatial array processing are presented and studied in this paper. Most of the radio propagation in the literature has been studied and modeled in a two dimensional plane. The 3D propagation channel modeling has drawn attention recently. This is due to the fact that, in some scenarios,(More)
An adaptive reduced-state sequence estimation (RSSE) receiver based on per-survivor processing (PSP) in conjunction with a local decision feedback equalizer (DFE) for the EDGE system with 8PSK modulation is proposed in this paper. A prefilter prior to the RSSE-PSP is exploited to reshape the channel impulse response (CIR) to have approximately a minimum(More)
This paper presents a higher performance uplink concept for the evolution of GSM/EDGE Radio Access Network (GERAN). The EGPRS2 UL concept can operate at 1.2 times the current GERAN symbol rate, and employ 4-, 16and 32-QAM constellations, concatenated with convolutional codes. The interference introduced by the higher transmit signal bandwidth is mitigated(More)
Assuming that multiple base stations (BSs) are coordinated for the joint reception of each user's transmitted signal in the uplink, we study the sum power minimization (SP-MIN) problem for the cellular systems. As BSs may have multiple antennas, power control and receive beamforming are jointly optimized with the adaptive multi BS set (MBS) selection for(More)
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