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For wireless multicast channels, it is prospective to provide quality of service (QoS) differentiation at physical layer. In this paper, we propose a rank-two transmit beamforming mechanism to support differentiated services (Diffserv) in multi-group multicasting scenarios based on Alamouti space-time coding (ASTC). In QoS-Diffserv multi-group multicast systems, two kinds of users exist, named high-priority...
Physical layer multicasting attracts tremendous research interests recently. In this paper, we propose a novel unitary precoder design for multicasting where two common data streams are sent to all users. With the successive interference cancelation (SIC) receivers, the two-input multi-output (TIMO) multicasting channel can be converted into two parallel sub-channels, then we focus on maximizing the...
A novel precoding scheme is proposed for MIMO multicasting systems, using the criterion of maximizing the minimal signal-to-interference-plus- noise ratio (SINR) among multiple data streams, while considering the minimum mean-squared-error decision feedback equalizer (MMSE-DFE) at each user side. We decompose the precoding matrix into a transformation matrix multiplied by a unitary matrix, and perform...
Given the optimal transmit beamforming vector, the user who has the worst signal-to-noise ratio (SNR) is referred to as a bottleneck user for a single-group multicasting system with multiple antennas at the transmit side. In this paper, we present some interesting insights into the bottleneck users, such as the maximum number as well as the optimal beamformer when the transmitter has an arbitrary...
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