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In this paper, we consider single-link mmWave transmission. We investigate the usual hybrid beamforming architecture under an additional constraint on the analog precoding stage. Namely, for practical reasons only partial interconnection between the antennas and the RF chains is allowed. We present a novel upper bound for spectral efficiency under this architecture constraint. We evaluate the tightness...
In the present paper we evaluate the performance of a hybrid digital/analog multi-beam beam-forming architecture with polarization and delay compensation using time reversal (TR). Double-directional, ultra wideband dual-polarized channel measurements at 70 GHz in a conference room have been used to emulate the channel. The use of multiple beams to mitigate human shadowing has been evaluated and the...
In the present paper we introduce the architecture of a hybrid digital / analog beam-forming with polarization compensation. To evaluate the performance of this architecture we use double-directional, ultra wideband dual-polarized channel measurements at 70 GHz that have been carried out in a small-office environment scenario at the TU Ilmenau. Different positions of Tx and Rx have been measured using...
In this paper, antenna diversity (AD) schemes are presented for frequency-domain (FD) multi-user detection (MUD) in the up-link (UL) of cellular systems which apply CP (Cyclic Prefix) assisted DS-CDMA (direct sequence code division multiple access). Alamouti-based space-time-code (STC) was applied to exploit transmitter (TX) diversity. The MUD and the diversity combining in the receiver (RX) are MMSE...
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