Abstract
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.
Highlights
The rapid growth of users’ traffics, continually increasing number of online devices, and more emerging mobile services and applications, have made the improvement of communication system’s capacity an important issue needs to be well addressed
Deploying small cells densely in existing cellular networks and improving spectrum efficiency via dynamic spectral access, spatial spectrum reuse, etc., are regarded as effective means to enhance network performance, interference has become an impediment in further improving the network capacity [1]
We consider X-interference channel (XIC) consisting of two transmission-pairs
Summary
The rapid growth of users’ traffics, continually increasing number of online devices, and more emerging mobile services and applications, have made the improvement of communication system’s capacity an important issue needs to be well addressed. In order to optimize the use of transmit power for IN and desired data transmission, [21] proposed a scheme called dynamic interference neutralization (DIN). With DoF cost at the interfered Rx, IS employs a steering signal to adjust the interference to the orthogonal direction of the interfered Rx’s desired transmission, eliminating the influence of interference. In order to optimally balance the transmit power for IS and desired signal’s transmission, [16] proposed dynamic interference steering (DIS). By noting that the steering signal carries the desired information of adjacent user served by the interfering Tx, we attempt to exploit such side-effect of IS so as to further enhance the system’s SE. Based on the above discussion, we will propose a space-power adaptive interference steering (SPAIS) method for XIC in this paper. E(·) denotes statistical expectation. a, b represents the inner product of two vectors
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