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In a cellular system, when multiple-input multiple-output (MIMO) techniques are employed, the interference scenario is quite complicated. In this paper, considering realistic propagation conditions including both path loss and Rayleigh fading, and considering the existence of unequal-power interferers, we analyze the statistical distributions of the post-processing SIRs for downlink space-time block...
In this paper, we propose two ad-hoc, yet efficient, power allocation strategies for a decentralized distributed space-time block coding (Dis-STBC) system where knowledge about the channel state information (CSI) is not available at the transmitter(s). The first is an open-loop strategy which requires no control signaling; the second is a feedback-assisted strategy which requires some control signaling,...
When MIMO techniques are used in a cellular system, the interference environment can become quite complicated. In this paper, we evaluate the impact of co-channel MIMO interference on the performance of space-time block coding in the downlink of a cellular-like system. In particular, we derive closed-form expressions for the probability density functions of the resulting signal-to-interference ratio...
The performance of Space-Time Block Coding (STBC) with co-channel MIMO interference is investigated. For an interference-limited environment, the closed-form expressions for the probability density functions of the signal-to-interference ratio are derived and applied to analyze the outage probability with three typical types of co-channel MIMO interferers: STBC, open-loop spatial multiplexing and...
Information theoretic studies have shown the significant performance improvements of cooperative communications. However, these studies ignore both the overheads incurred in real implementations of the cooperative techniques at the physical layer and their interactions with higher layer protocols in a networking context. In this paper, we study the performance of realistic networking scenarios facilitated...
In this paper, a cooperative network coding scheme is proposed for a two-stage selective decode-and-forward relaying network with multiple source-destination pairs. In particular, based on employing Best-Select cooperation to perform relay selection, the selected best relay performs network coding on the correctly decoded information from all the sources, by transmitting a random linear combination...
Distributed space-time-block-coding (Dis-STBC) achieves diversity through cooperative transmission among geographically dispersed nodes. In this paper, we present a power-efficient relay-selection strategy for decentralized Dis-STBC in a selective decode-and-forward two-stage relaying network. In particular, each decoded node broadcasts a small amount of information with limited power. This node then...
Two fundamental properties of wireless networks, the variable link quality and the broadcast nature of the transmission, have often been ignored in the design of routing protocols. In this paper, we address the routing issue in broadband systems from a link-layer point of view. We focus on a clustered multihop wireless network. A link quality metric is first proposed to measure broadband links; then,...
Distributed space-time-block-coding (Dis-STBC) achieves diversity through cooperative transmission among geographically dispersed nodes. In this paper, we evaluate the performance of several decentralized Dis-STBC schemes in a selective decode-and-forward two-stage relaying network. In particular, we consider schemes without a central control unit or inter-node communications. These include a pre-assignment...
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