Interference Mitigation via Relaying
نویسندگان
چکیده
This paper studies the effectiveness of relaying for interference mitigation in an interference-limited communication scenario. We are motivated by the observation that in a cellular network, a relay node placed at the cell-edge observes intercell interference that is correlated with intended receiver’s interference. A relaying link can effectively allow their antennas to be pooled together for both signal enhancement and interference mitigation. We model this scenario by a multiple-input multiple-output (MIMO) Gaussian relay channel with a digital relay-destination link of finite capacity, with correlated noises across relay and destination antennas. Assuming compress-and-forward strategy with Gaussian input distribution and quantization noise, we characterize the achievable rate using a coordinate ascent algorithm for jointly optimizing transmit and quantization covariance matrices. For fixed input distribution, the globally optimum quantization noise covariance matrix can be found in closed-form using a transformation for the relay’s observation that simultaneously diagonalizes two conditional covariance matrices by *congruence. For fixed quantization, the globally optimum transmit covariance matrix can be found via convex optimization. This paper further shows that such an optimized achievable rate is to within a constant additive gap of capacity of the channel, and that the optimal structure of the quantization noise covariance enables a characterization of the slope of the achievable rate as a function of the relay-destination link capacity. Finally, this paper studies the improvement in spatial degrees of freedom (DoF) by MIMO relaying in presence of noise correlation and reveals a relation between the DoF gain and the aforementioned slope via a connection to the deterministic relay channel capacity. Index Terms Gaussian MIMO relay channel, noise correlation, compress-and-forward, reverse water-filling, approximate capacity.
منابع مشابه
Coexistence and Interference Mitigation for Wireless Body Area Networks: Improvements using On-Body Opportunistic Relaying
Coexistence, and hence interference mitigation, across multiple wireless body area networks (WBANs) is an important problem as WBANs become more pervasive. Here, two-hop relay-assisted cooperative communications using opportunistic relaying (OR) is proposed for enhancement of coexistence for WBANs. Suitable time division multiple access (TDMA) schemes are employed for both intra-WBAN and inter-...
متن کاملRelay Architectures for 3GPP LTE-Advanced
The Third Generation Partnership Project’s Long Term Evolution-Advanced is considering relaying for cost-effective throughput enhancement and coverage extension. While analog repeaters have been used to enhance coverage in commercial cellular networks, the use of more sophisticated fixed relays is relatively new. The main challenge faced by relay deployments in cellular systems is overcoming th...
متن کاملInterference Management Schemes for the Shared Relay Concept
Sharing a multiantenna relay among several sectors is a simple and cost-effective way to achieving much of the gains of local interference mitigation in cellular networks. Next generation wireless systems, such as ones based on the Third Generation Partnership Projects Long-Term Evolution Advanced, will employ universal frequency reuse to simplify network deployment. This strategy is anticipate...
متن کاملMIMO Multiway Distributed-Relay Channel with Full Data Exchange: An Achievable Rate Perspective
We consider efficient communications over the multiple-input multiple-output (MIMO) multiway distributed relay channel (MDRC) with full data exchange, where each user, equipped with multiple antennas, broadcasts messages to all the other users via the help of a number of distributive relays. We propose a physical-layer network coding (PNC) based scheme involving linear precoding for channel ali...
متن کاملFrequency Reuse Scheme With Three Regions in Cooperative Relaying For Multi-cell OFDMA Systems
Cooperative relaying has shown as promissing approach to improve transmission reliability in cellular network. In this paper cooperative relaying and frequency reuse partitioning are exploited to avoid the co-channel cell interference (CCI) in the downlink multi-cell OFDMA systems. In our system layout, each cell is divided into three regions: the central region, the middle region and the edge ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- CoRR
دوره abs/1707.02222 شماره
صفحات -
تاریخ انتشار 2017