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Due to its favorable peak-to-average power ratio (PAPR), a single-carrier frequency-division multiple access (SC-FDMA) scheme has been chosen for the 3GPP Long Term Evolution Advanced (LTE-A) uplink, as opposed to the orthogonal frequency-division multiple access (OFDMA) scheme used in the downlink. SC-FDMA, however, is prone to suffer from the effects of inter-symbol interference. When combined with...
For automotive applications car to infrastructure wireless communications enable delivering infotainment services such as location based information, voice calls and video streaming. Those services require a reliable high data rate connection which could be provided by cellular LTE which supports channel adaptive MIMO transmission. However, at the automotive side, confined space is available to accommodate...
In this paper, results on the mutual information of MIMO transmission over spatially correlated channels in slow fading environments are presented. Different receiver techniques such as optimal maximum likelihood detection, parallel layer detection, successive interference cancellation detection and linear detection are compared. The transmit signals are derived from finite signal alphabets such as...
Coordinated Multi-Point and relaying are two likely candidates for the upcoming LTE-Advanced standard, as both are able to satisfy the ever increasing demands for ubiquitous services with higher data rates. In this paper, we present field trial results for both techniques and discuss the most challenging problems during the implementation process in the EASY-C testbed in downtown Dresden.
Upcoming multi antenna systems such as 3GPP-LTE employ code book based multi-mode preceding in order to adapt to a wide range of channel conditions. Link adaptation, which includes the selection of preceding matrices, the number of spatially multiplexed layers as well as modulation coding schemes is a crucial task, carried out by the receiver. In this contribution we propose link adaption based on...
Knowledge of the channel between all transmit-receive antenna pairs is essential for enabling the decoupling of spatial streams and coherent data detection in wireless MIMO-OFDM systems. The design of the preamble structure for MIMO channel estimation in an ad-hoc system depends on the number of transmit antennas in the system. A challenge at the receiver is therefore to accurately detect the number...
In wireless MIMO-OFDM systems, knowledge of the channel between all transmit-receive antenna pairs is essential to enable the decoupling of spatial streams and coherent data detection at a receiver. Regarding a typical preamble design for MIMO channel estimation in an ad-hoc network, the preamble structure depends on the number of transmit antennas and this number must be known before the actual MIMO...
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