2005 IEEE 61st Vehicular Technology Conference
DOI: 10.1109/vetecs.2005.1543936
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Adaptive MIMO Transmission Scheme: Exploiting the Spatial Selectivity of Wireless Channels

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Cited by 38 publications
(16 citation statements)
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“…However, for MIMO-OFDM systems, the norm of the channel matrix, ( ), H  of the th  subcarrier is not a good measure of channel quality [15]- [16]. The condition number of the channel matrix of a MIMO-OFDM subcarrier provides a good measure of the quality of the subcarrier, especially for suboptimal receivers at high signal-to-noise ratio (SNR) [17]. Several reports discuss the impact of the condition number on channel quality [18]- [20].…”
Section: Introductionmentioning
confidence: 99%
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“…However, for MIMO-OFDM systems, the norm of the channel matrix, ( ), H  of the th  subcarrier is not a good measure of channel quality [15]- [16]. The condition number of the channel matrix of a MIMO-OFDM subcarrier provides a good measure of the quality of the subcarrier, especially for suboptimal receivers at high signal-to-noise ratio (SNR) [17]. Several reports discuss the impact of the condition number on channel quality [18]- [20].…”
Section: Introductionmentioning
confidence: 99%
“…The MIMO-OFDM signaling allows retransmission of susceptible symbols corresponding to those subcarriers that have a large condition number. In [17], the condition number of the MIMO channel is used to choose a modulation scheme. In the proposed method, we use the condition number ( )   of the channel matrix corresponding to the th  subcarrier as an indicator of channel quality for selective retransmission.…”
Section: Introductionmentioning
confidence: 99%
“…Adaptive MIMO systems can be simultaneously robust and spectrally efficient. Hence, they have received lot of interest, see e.g., [1][2][3][4][5][6]. Adaptive MIMO-OFDM technology has already been adopted in many communication systems and standards, for example, in the WiMAX [7] and in the 3GPP LTE [8].…”
Section: Introductionmentioning
confidence: 99%
“…However, the MIMO channel conditions may vary substantially from line-of-sight (LOS) to non-line-of-sight (NLOS) conditions leading to large codebook sizes. In order to follow highly fluctuating MIMO channel conditions a simple spatial mode adaptation between beamforming, diversity and multiplexing based on signal-to-noise ratio (SNR) and channel condition number is proposed in [6]. However, the system requires a two-dimensional look-up table to switch between different transmission modes.…”
Section: Introductionmentioning
confidence: 99%
“…Extending this scheme, in [2] a "dual-mode" antenna selection scheme is outlined, which uses the condition number to choose between multiplexing and general diversity techniques. Some other systems have used the condition number to identify the current propagation environment and then to pick the best transmission method accordingly [3]. In addition to (1), sometimes the ratios of other eigenvalue pairs are also of interest.…”
Section: Introductionmentioning
confidence: 99%