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We consider adaptive downlink beamforming strategy for multiuser Multi-Input Single-Output(MISO) systems. It is well known that the non-linear dirty paper coding (DPC) can entirely eliminate the interference of the other users, but it is computationally prohibitive. The Zero-Forcing Beamforming (ZFBF) is an alternative solution also with high complexity due to the inversion of composite channel matrix...
Unitary space-time modulation (USTM) is ideally suited for rapid fading scenarios, where neither the transmitter nor the receiver have the channel state information (CSI). However, it has received limited attention compared with the space-time coding schemes that need CSI. An important reason for that is USTM needs too large calculation amount when meeting with a large size constellation. We propose...
Transmit antenna shuffling (TAS) has been used widely in Double Space Time Transmit Diversity (DSTTD) systems for performance improvement. In this paper, an angle feedback and its feedback selection criterion applied in a space time coding scheme are proposed for DSTTD systems. Compared with the existing TAS scheme, according to the analysis of system, the proposed scheme has lower realization complexity...
The downlink of multi-user multiple-input single-output (MU-MISO) wireless system with ERB (equal rate and BER) precoding scheme is considered in this paper, where the base station is equipped with multiple antennas and each mobile user is constrained to a single antenna. Since the number of users supported by the BS is limited by the number of transmit RF chains, the system should exploit user scheduling...
Space time coding in the case where the channel state information is unknown has received only limited attention, although a signaling scheme called unitary space-time modulation (USTM) has already been proposed. An important reason for the impracticability of USTM is its too large calculation amount when meeting with a large size constellation. We propose a size-reduced method for constellation of...
An intrinsic pitfall of unitary space-time modulation is that its performance is unsatisfactory at low signal-to-noise ratio. Concatenating it with turbo code is a possible solution, however, bit wise processing results in unacceptable calculation mount. A novel scheme employing unitary space-time symbol base turbo code can greatly reduce the time delay but its MAP decoding algorithm may lead to system...
The double space time transmit diversity (DSTTD) system was proposed to obtain both transmit diversity gain and spatial multiplexing gain simultaneously. The DSTTD scheme outperforms general multiple input multiple output (MIMO) scheme, however the performance can be enhanced by using receive antenna selection (RAS) scheme and transmit antenna shuffling (TAS) scheme. In this paper, we realized the...
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