Abstract
In this paper, we consider wireless transmissions over directional multiple-input single-output (MISO) two wave with diffuse power (TWDP) fading channels, subject to interference over the same type of channel. TWDP fading is known to exhibit an outage behavior that can be even worse than Rayleigh fading and has experimentally been observed in a number of vehicular channel measurement campaigns. To enhance the reliability of multi-point transmissions over MISO TWDP fading channels, we propose a zero-forcing based coordinated beamforming scheme, for which we can analytically characterize and optimize the outage probability of the multi-point transmissions. Based on the developed outage expressions, we furthermore propose a greedy coordinated scheduling approach that attempts to maximize the achievable rate of the system. Finally, we propose a transmission rate adaptation scheme for fixed size packet transmissions, which supports reliable and at the same time resource efficient multi-point transmissions.
Highlights
M OBILE wireless communication systems have long been pure best-effort services, which are, as such, not able to guarantee a demanded level of link reliability
For non-critical applications as supported in fourth generation (4G) long term evolution (LTE), the packet transmission success probability lies in the order of 99 %, whereas for saftey-critical applications, e.g., in the context of vehicular communications, the success probability must be as high as 99.99 999 % [8]
Reliable communication architectures have to be able to accurately predict the outage performance of the offered service. This is often hard as the probability distribution of the signal to interference and noise ratio (SINR) of the communication link can in many cases not be characterized analytically
Summary
M OBILE wireless communication systems have long been pure best-effort services, which are, as such, not able to guarantee a demanded level of link reliability. This is a reasonable assumption for mmWave transmissions in mobile scenarios, as the signal phases change significantly even for small movements in the order of millimeters This random/unknown phase assumption leads to TWDP fading of the effective SISO channels (including transmit/receive beamformers), which significantly impairs the outage performance of the communication links. We consider CSIT assumptions that are suitable for mmWave transmissions in mobile scenarios, where the transmitters (infrastructure nodes) are equipped with antenna arrays and the receivers are equipped with single directional receive antennas For such situations it has been shown by measurements that TWDP fading is suitable to characterize the fading of the effective channels (including the spatial filtering effects of the directional receive antennas) [25], [26], [47]. TWDP fading channels under the proposed zero-forcing r beamforming strategy Based on this outage characterization, we develop methods for multi-point scheduling and transmission rate adaptation to support reliable communication links. The expected value of random variable r is E(r) and the probability of random event a is P (a)
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