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This letter considers an efficient pilot scheme for two-way relay system with massive antennas in the relay base station (BS). For such a system, we prove that user terminals (UTs) in the same communication pair can reuse the pilot sequence without performance loss. Hence, only $K$ pilot symbols are required to support $2K$ UTs while $2K$ pilot symbols are needed in conventional cases. We analyze...
This paper presents cross-correlation characteristics of multi-link channels considering cooperative communication scenarios. We introduce the wideband multiple input multiple output (MIMO) relay channel sounding system to simultaneously measure multi-link channels at 3.7GHz frequency band. The outdoor channel measurement campaign has been performed by realization of two-link channels in residential...
Spatial auto- and cross-correlation characteristics of propagation channels are investigated for four indoor scenarios using measurement data. In addition to the well-known spatial auto-correlation effect, significant cross-correlation between channels is also observed. We found that non-zero spatial cross-correlation among channels may occur in three scenarios with possibly different mechanisms....
In this contribution, the measurement scenario of relay channel is designed in indoor environment based on the measurement technology of Virtual MIMO, and three kinds of relay links are measured separately by our own real-time channel measurement platform at 2.5GHz. We analyze the characteristics of shadow fading and correlation about relay channel. The percentage error of shallow fading between each...
In this contribution, we derive the spread function and power spectrum of the so-called "relay channel'' along which electromagnetic waves propagate from a source station to a destination station via multiple amplify-and-forward (AF) relay stations. These results show analytically that the propagation over such a relay channel can be influenced by the propagation in individual "hops'' and...
In this contribution, an analytical expression is derived for the correlation matrix of the multiple-input multiple-output (MIMO) propagation channel for the amplify-and-forward relay transmission systems. In order to understand the cross-correlation mechanism, we derive the spatial correlation of two arbitrary channels between the source and the destination via relay stations in terms of the direction-delay...
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