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In 3GPP LTE-Advanced Release-12, the feature of dual connectivity (DC) has been introduced to enhance small cell networks from the aspects of higher layer architecture and physical layer procedures, which can improve mobility robustness and per-user throughput as well as avoid frequent hard handover among small cells. To guarantee the UE maximum transmit power is not exceeded, the conventional power...
In this paper, we propose an enhanced multi-user eigen channel selection (E-MES) solution for multiple-input multiple-output (MIMO) multi-user downlink transmissions exploiting sequential projection and zero-forming (ZF) algorithm. In the existing solutions, eigen channel of each candidate user was pre-defined at the start of the multi-eigen selection, and this limits user's eigen channel adaptation...
Carrier aggregation (CA) is one technique in Long Term Evolution — Advanced (LTE-A) system, which can extend the bandwidth up to 100MHz and increase the downlink and uplink spectral efficiency. In particular, NxDFT-s-OFDM has been agreed as the uplink bandwidth extension scheme. Nevertheless, the peak-to-average power ratio (PAPR) remains an important issue for user equipment (UE) because it determines...
Recent research shows that K user time-varying interference channel is capable of achieving K/2 degrees of freedom based on the idea of interference alignment. In multiple-input-multiple-output (MIMO) interference channels, appropriate transmit precoder design plays a pivotal role in efficiently suppressing the co-channel interference. In this paper, we propose a generalized precoder design forMIMO...
Coordinated multipoint (CoMP) transmission is capable of significantly improving both the cell average and cell-edge performance in terms of spectral efficiency (SE). It is therefore regarded as a key enabling technique in the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE)-Advanced. Early research mainly concentrates on coordinated transmissions from several eNBs. Recently, coordination...
Coordinated multipoint (CoMP) processing is regarded as an enabling technique in Long Term Evolution (LTE)-Advanced to improve both the cell average and cell-edge spectral efficiency (SE). In this paper, we propose a novel precoder design algorithm based on polar decomposition (PD) for non-coherent joint processing CoMP (NCJP-CoMP) in order to enhance the cell-edge performance, when considering the...
Designing transmit precoding vectors based on maximizing signal-to-leakage-and-noise ratio (SLNR) provides a practical solution to the coupling problem encountered in the conventional designing methodology by maximizing signal-to-interference-plus-noise ratio (SINR). In this contribution, a simple but sophisticated iterative algorithm is proposed to find the optimal power allocation for the sake of...
We propose a linear precoding technique, called multiuser generalized eigenmode transmission (MGET), based on the leakage-based precoding technique. A signal-to-leakage-plus-noise (SLNR) precoding scheme is one approach for linear precoding in the multiple-input multiple-output broadcast channel that sends multiple data streams to different users in the same cell. Unfortunately, SLNR-based scheme...
In this paper, the capacity of MIMO relay channel with decode and forward (DF) scheme is investigated, where each node within the system quipped with multiple antennas and located in an environment with distance-dependent path loss. In order to achieve the maximum capacity of the system, the optimal power allocation (OPA) among the nodes and the transmit antennas is analyzed under the assumption that...
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