With the rapid development of wireless communication technologies, interference has become a key impediment in the improvement of network capacity. In practice, although dense deployment of network can effectively increase the spectrum efficiency, severe co-channel interference (CCI) is likely incurred, especially for mobile users in the overlapping areas of multiple access points, leading to serious deterioration of these users' spectral efficiency (SE). Interference steering (IS), emerging as a novel interference management (IM) scheme, can not only eliminate the impact of interference on the desired transmission, but also incur less power overhead than other IM methods. Although some works conducted flexible design of IS via power domain adaptation, the space domain flexibility has not been exploited. Moreover, existing IS works are mainly for the Z-interference channel (ZIC), while in practical use X-interference channel (XIC) is more common. To remedy the above deficiencies, this paper proposes a space-power adaptive interference steering (SPAIS) method in XIC. By adaptively adjusting the strength and spatial feature of the steering signal, SPAIS can not only effectively suppress interference imposed on the interfered receiver (Rx), but also make full use of the power of the steering signal, thus enhancing desired data transmission. Our in-depth simulation results show that compared to existing IM methods, SPAIS can significantly improve the users' SE performance.

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Space-Power Adaptive Interference Steering to Manage Interference in XIC

With the rapid development of wireless communication technologies, interference has become a key impediment in the improvement of network capacity. In practice, although dense deployment of network can effectively increase the spectrum efficiency, more severe co-channel interference (CCI) is likely incurred, especially for the mobile users in the overlapping areas of multiple access points. Such users' spectral efficiency (SE) is seriously deteriorated due to the influence of interference. Interference steering (IS), emerging as a novel interference management (IM) scheme, can not only eliminate the impact of interference on the desired transmission, but also incur less power overhead than other IM methods. Some IS works conducted flexible design of IS via power domain adaptation. However, the spatial domain flexibility is not fully exploited. Moreover, existing IS works are mainly for the Z-interference channel (ZIC), while in practical use X-interference channel (XIC) is more common. To remedy the above deficiencies of IS design, this paper proposes a space-power adaptive interference steering (SPAIS) method in XIC. By adaptively adjusting the strength and spatial feature of the steering signal, SPAIS can not only effectively suppress interference imposed on the unintended receiver (Rx), but also make full use of the power of the steering signal in enhancing desired data transmission. Our in-depth simulation results show that compared to existing IM methods, SPAIS can significantly improve the users' SE performance.

Space-Power Adaptive Interference Steering

The invention belongs to the technical field of wireless communication, and discloses an interference utilization method based on dynamic power distribution and a wireless communication system. Wherein the transmitters share channel state information and data information, and the transmitter corresponding to the interfered receiver calculates an optimal power distribution factor according to the information and constructs an interference utilization signal; And the transmitter corresponding to the interfered receiver dynamically distributes the transmitting power to the interference utilization signal and the expected signal according to the optimal power distribution factor, and the interfered receiver filters the received mixed signal containing the expected signal, the interference andthe interference utilization signal so as to recover the expected data. According to the method, the transmitting power of the interfered communication pair is optimally utilized, the interference onthe interfered receiver is converted into the expected signal by generating the interference utilization signal with proper intensity, the utilization of interference energy is realized, the spectrumefficiency of the interfered receiver can be obviously improved, and the method can be used for solving the interference problem in wireless communication.

Interference utilization method based on dynamic power distribution and wireless communication system

Interference analysis of anti micro and small unmanned aerial vehicles and mobile communication systems uplink

Interference alignment (IA) in the spatial domain has been recognized as an important technique to handle the interference in dense network. However, traditional IA is flawed especially for large scale antenna systems. With challenges brought by hybrid precoding, IA cannot be perfectly achieved with limited radio frequency (RF) chains. In this article, we adopt the thought of interference subspace alignment (ISA) and provide full digital and hybrid precoding schemes for multi-cell multi-user systems under an interfering broadcast channel model. For full digital precoding, we derive the requirement for transmitting antennas to achieve ISA. A closed-form ISA solution space is further developed, where the interference subspace of each user is no longer constrained. Then, a projection-based ISA algorithm is proposed for full digital precoding. The projection from the selfish design to the ISA solution space strengthens the desired signal while achieving ISA. For hybrid precoding, we formulate a vector approximation problem to minimize interference misalignment. A novel generalized gradient projection algorithm is proposed to design each RF chain. To approximately achieve ISA, two algorithms are proposed with different approximation principles. For low SNR, a specific vector in the ISA solution space is approximated to combat additive noise, while for high SNR, the whole ISA solution space is approximated to suppress interference. The proposed schemes are further extended to imperfect CSI cases for more practical scenarios. Simulation results highlight that the proposed full digital and hybrid precoding schemes can effectively handle the inter-cell and intra-cell interference and outperform the existing schemes.

Interference Subspace Alignment-Based Precoding Design for Multi-Cell Multi-User Systems

The invention belongs to the technical field of the wireless communication, and discloses a power self-adaptive interference neutralization method of symmetric interference topology in a wireless communication system A mobile station respectively estimates channel state information between the mobile station and a home base station and feeds back to the home base station; the data and the channelstate information are shared between the base stations; the base station respectively designs transmitting pre-coding vector of an expected signal according to the channel state information; the basestation designs the precoding vector of a neutralization signal according to the interference received by the own service user from the other base station and constructs the neutralization signal; the base station simultaneously sends the expected signal and the neutralization signal; two base stations perform self-adaptive adjusting on the power of the neutralization signal for maximizing the whole system spectrum efficiency Under the interference symmetric topology, the power distribution proportion of the neutralization signal and the expected signal are excellently balanced through the base station side collaboration, the influence of the interference is effectively reduced, and the spectrum efficiency of the system is improved

Power self-adaptive interference neutralization method of symmetric interference topology in wireless communication system

Interference management (IM) is essential to wireless communication systems, but it is also known to consume transmission resource such as power and degree of freedom, hence degrading users’ achievable spectral efficiency (SE) Therefore, it is important to select an appropriate IM method with optimal operating parameters so as to balance the benefits brought by and the cost of IM Interference neutralization (IN) has recently been receiving considerable attention, with which a duplicate of interference of the same strength and opposite phase with respect to the original interfering signal is generated to neutralize the disturbance at the intended receiver However, to the best of our knowledge, all existing IN schemes assume that interference is completely neutralized without accounting for their power consumption To remedy this deficiency, we propose a novel scheme, called dynamic interference neutralization (DIN) By intelligently determining the appropriate portion of interference to be neutralized, we balance the transmitter’s power used for IN and the desired signal’s transmission We then extend the proposed DIN to general cases where the numbers of interferences, desired data streams, as well as pico base stations and pico user equipments, are variables Moreover, in addition to the design under asymmetric interference topology, the application of DIN in symmetric interference situation is also presented Our in-depth analysis and simulation have shown that the proposed strategy can make better use of the transmit power than existing IM methods, hence enhancing users’ SE

When and how much to neutralize interference? Balancing the benefits and cost of interference management

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Space-Power Adaptive Interference Steering to Manage Interference in XIC

Power self-adaptive interference neutralization method of symmetric interference topology in wireless communication system

Space-Power Adaptive Interference Steering

When and how much to neutralize interference? Balancing the benefits and cost of interference management