Node Pair Selection Schemes Using Interference Alignment in MIMO Interference Channel with Cooperation

Interference alignment with efficient dynamic information selection for LTE-A uplink coordinated multipoint systems

“…Some algorithms had been proposed at the transmitter [12][13]. The dynamic information selection is used at the receiver in our researches.…”

“…In [12][13], the node pair selection schemes had been used at the transmitter. However, in this section, three kinds of information selection schemes are proposed to further enhance the sum-rate or the outage probability based on SINR value in (17) at the receiver.…”

“…The outage probability of QPSK versus different transmit power shows in figure 3, and the iteration number of IA is one. The ϒ th in [12][13] is 4.32dB for the bit error rate (BER) =10 -2 of QPSK modulation. The proposed UL CoMP system involves the MMSE equalizer as shown in (16), which will improve the sum-rate and outage probability performances.…”

“…The key idea is that users coordinate their transmissions, using linear precoding, such that the interference signal lies in a reduced dimensional subspace at each receiver. So far, there is no closed-form solution of IA for more than three users, so the iterative approached based on reciprocity have been employed to search the best IA algorithm [7][8][9][10][11][12]. In [8][9][10][11], authors use the iterative IA, i.e., the maximum signal to interference-plusnoise (Max-SINR) IA, to generate the nearly optimal solution.…”

“…However, the sum-rate performance can be further enhanced by selected information from other base stations properly by the CU in the uplink (UL) CoMP system of boundary communication. In [12][13], the node pair selection is proposed for downlink (DL) CoMP system, each transmitter makes pair with the certain receiver with a permutation matrix at the transmitter side. But, in UL system, transmitters are separated without any coordination.…”