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Analog combining of multiple receive antennas with OFDM

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2 Author(s)
Sandhu, S. ; Intel Corp., Santa Clara, CA, USA ; Ho, M.

Optimal signal processing of M receiver antennas requires digitization of each of the M RF signals. For example, MRC (maximal ratio combining) of M receiver antennas requires M ADCs (analog to digital converters). Since the ADC is a highly power-consumptive component in current receiver chain architectures, we investigate suboptimal signal processing schemes that combine M analog signals before digitization, thus enabling a much cheaper implementation with a single ADC. We focus on IEEE 802.11a like OFDM LAN systems with one transmit and multiple receiver antennas (SIMO - single input multiple output), with perfect channel knowledge at the receiver. Our scheme uses scalar weights to combine the receiver antennas in the time-domain. These weights are a function of the spatio-temporal channel matrix. The results are very promising: 4-antenna linear combining (LC) outperforms 2-antenna selection diversity by 5-7 dB at an uncoded BER of 0.01, and this margin is even wider at lower BERs.

Published in:

Communications, 2003. ICC '03. IEEE International Conference on  (Volume:5 )

Date of Conference:

11-15 May 2003