Abstract
The single-input single-output (SISO) orthogonal frequency-division multiplexing (OFDM) systems for wireless local area networks (WLAN) defined by the IEEE 802.11a standard can support data rates up to 54 Mbps. In this paper, we consider deploying two transmit and two receive antennas to increase the data rate up to 108 Mbps. Applying our recent multiple-input multiple-output (MIMO) transceiver designs, that is, the geometric mean decomposition (GMD) and the uniform channel decomposition (UCD) schemes, we propose simple and efficient closed-loop MIMO-OFDM designs for much improved performance, compared to the standard singular value decomposition (SVD) based schemes as well as the open-loop V-BLAST (vertical Bell Labs layered space-time) based counterparts. In the explicit feedback mode, precoder feedback is needed for the proposed schemes. We show that the overhead of feedback can be made very moderate by using a vector quantization method. In the time-division duplex (TDD) mode where the channel reciprocity is exploited, our schemes turn out to be robust against the mismatch between the uplink and downlink channels. The advantages of our schemes are demonstrated via extensive numerical examples.
Highlights
The single-input single-output (SISO) orthogonal frequency-division multiplexing (OFDM) systems for wireless local area networks (WLAN) defined by the IEEE 802.11a standard can support data rates up to 54 Mbps [1]
The multiple-input multipleoutput (MIMO) communication technology is widely regarded as a key to achieve such a high data rate
In [6], a power allocation method was proposed based on the minimum mean-squared error (MMSE) criterion for the MIMO systems
Summary
The single-input single-output (SISO) orthogonal frequency-division multiplexing (OFDM) systems for wireless local area networks (WLAN) defined by the IEEE 802.11a standard can support data rates up to 54 Mbps [1]. In [6], a power allocation method was proposed based on the minimum mean-squared error (MMSE) criterion for the MIMO systems. In this paper we propose simple and efficient closed-loop designs for MIMO-OFDM-based WLANs. We focus on the IEEE 802.11a standard, our schemes are applicable to other standards including the US standard IEEE 802.11g and the European standard HIPERLAN/2 [7]. IN is the N × N identity matrix; det(·) is the determinant of a matrix and E[·] denotes the expectation operation
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