Abstract
We consider orthogonal space-time block codes (OSTBC) in vehicular environments, where the channels are nonidentically distributed. It is shown that the nonidentical channel statistics lead to nonidentical channel estimation errors, which consequently affect the performance and even the existing receiver structure of OSTBC. We show that the conventional symbol-by-symbol (SBS) decoder of OSTBC is suboptimum in vehicular environments. A new optimum decoder is derived, which can be simplified to a new SBS decoder under certain conditions. To the best of our knowledge, our work here is the first to consider the optimum decoder for OSTBC in vehicular environments. Performance analysis and simulations are provided, which show that our new decoder substantially outperforms the conventional decoder.
Highlights
Wireless vehicular communications, for example, vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications, have attracted more and more attention [1,2,3,4,5], as they show substantial potential to enhance the traffic safety [2], efficiency, and information availability [3]
Several standards are being developed for vehicular communications, such as IEEE 802.11p—wireless access of vehicular environments (WAVE), or IEEE 802.20, which is designed for high-speed mobility situations, for example, for a high-speed train
The receiver structure and the performance of orthogonal space-time block code (OSTBC) have been extensively studied in many works with both perfect and estimated channel state information (CSI) at the receiver; see [8,9,10] and the references therein
Summary
Wireless vehicular communications, for example, vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications, have attracted more and more attention [1,2,3,4,5], as they show substantial potential to enhance the traffic safety [2], efficiency, and information availability [3]. The receiver structure and the performance of OSTBC have been extensively studied in many works with both perfect and estimated channel state information (CSI) at the receiver; see [8,9,10] and the references therein. These works, are based on the assumption that the channels are independent and identically distributed (i.i.d.), but this assumption is not expected to hold in vehicular environments. Non-identical channels will result in nonidentical channel estimation errors These estimation errors will affect the performance of the current systems, and even the structure of the existing receiver.
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