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More than half of the mobile backhaul connections are wireless and huge capacity promise of mmW bands is compelling to cope with the increasing data capacity for future 5G system. We reported a backhaul E-band measurement campaign focusing on radio system measurements with the demonstrator developed in the project. The evaluations include the throughput measurement with different modulation coding...
It is expected that small cells will carry more than half of the total traffic in 5G, resulting in a huge increase of wireless backhaul traffic. To successfully design and deploy the mmW backhaul system, it is essential to evaluate the performance in different scenarios, also links installed in low human height-level elevations. We report a recent 5G E-band backhaul system measurement campaign focusing...
This paper proposes a strategy, described via a process, which can help collaborative research projects impact standards and engage with regulatory bodies. The process is being successfully used by a running EU-funded project that is taken as a concrete example of how to link in a proper way innovation and pre-development activities to standards. The proposed methodology has a general validity and...
In the framework of the forthcoming 5G telecommunication system, the definition of realistic use cases and prototypes strongly connected to them is key in order to demonstrate how well emerging enabling technologies can fulfil the challenges introduced by the 5G Heterogeneous Network (HetNet) architecture. This paper shows how millimeter wave (mmWave) technologies can be properly assessed by selecting...
We present an approximate rate adaptation algorithm for MIMO spatial multiplexing transmission over multiple time-variant subchannels, based on delayed inaccurate feedback. The algorithm exploits an approximation to the mutual-information-averaged post-equalization signal-to-interference-and-noise- ratio statistics. It is suited for linear and successive interference cancelation MIMO receivers. We...
LTE and LTE-Advanced have been optimized to deliver high bandwidth pipes to wireless users. The transport mechanisms have been tailored to maximize single cell performance by enforcing strict synchronism and orthogonality within a single cell and within a single contiguous frequency band. Various emerging trends reveal major shortcomings of those design criteria: • The fraction of machine-type-communications...
Generalized frequency division multiplexing (GFDM) is a multi-carrier modulation scheme. In contrast to the traditional orthogonal frequency division multiplexing (OFDM), it can benefit from transmitting multiple symbols per sub-carrier. GFDM targets block based transmission which is enabled by circular pulse shaping of the individual sub- carriers. In this paper we propose a low complexity design...
In this work we discuss the aspect of channel prediction for cooperative multi-cell downlink transmission, where channel state information (CSI) of all users need to be available at all cooperating base stations (BSs). We assume that users feed CSI back to its local BS which forwards it to the other cooperating BSs using backhaul connections. In case of feedback and backhaul latency, CSI of a single...
The low peak-to-average power ratio of SC-FDMA, employed in the 3GPP-LTE-Advanced uplink, comes at the cost of tremendously increased receiver complexity as compared to OFDM. In this work, we investigate the achievable rate of four low-complexity, mismatched receiver designs based on our recently developed generalized mutual information framework. The receiver performance is analyzed depending on...
In this paper, a two-stage detector is proposed for signals transmitted using multiple antenna configurations over frequency-selective channels. For the first stage, a frequency domain equalizer applying the minimum mean-squared error criterion is used to mitigate the intersymbol interference introduced by the channel's non-flat frequency response. Following, the output of this frequency domain equalizer,...
In this work we investigate rate adaptation for successive interference cancelation (SIC) receivers in per-spatial layer coded MIMO systems using outdated channel state information (CSI). Outdated CSI may cause the rate adaptation to be too optimistic, which results in transmission errors and, in case of SIC receivers, error propagation. By carefully accounting for the error propagation problem it...
We investigate simplified, yet mismatched, receivers for SC-FDMA MIMO transmission currently employed in the 3GPP LTE-Advanced uplink. The receivers are based on frequency domain equalization and time domain detection. Rates achievable by those mismatched receivers with arbitrary input alphabets are derived in terms of generalized mutual information. The results allow to compare the impact of certain...
In this paper we investigate MIMO spatial multiplexing transmission over slowly time-variant, block-static fading channels with linear receivers. The system can adapt the transmission rate per spatial layer based on outdated channel state information. Two approximate low complexity approaches, based on the log-transformed post equalization SINR, are presented to adjust the transmission rate adaptively...
In this paper mutual information maximizing linear precoding for MIMO transmission using finite signal alphabets and a parallel layer MIMO detection scheme is derived. The derivation exploits that the mutual information of the parallel detection scheme can be expressed in terms of the mutual information associated with optimal maximum likelihood detection. Results show that the large performance gap...
This work presents results for wireless outdoor MIMO transmission experiments at 2.68 GHz, which were conducted in an urban residential area, using realistic handset and base station antennas. Characteristic parameters of MIMO systems, obtained from measurements, were compared to theoretical results. From the comparison it could be concluded that the transmission of two spatial streams was well supported...
Precoding at the transmitter side facilitates the use of linear MIMO detection schemes, which are attractive for low-complexity receiver implementations. However, their performance remains sensitive to the impact of spatial correlation caused by mutual coupling between antenna elements and the spatial propagation conditions of the wireless channel. We discuss how to apply non-linear detection, which...
An optimized multiple-input-multiple-output (MIMO) antenna system is proposed. It is based on the traditional planar inverted-F antenna (PIFA) design, accommodated on a printed circuit board (PCB) for mobile handsets and operating at 21.6GHz. The PIFA dimension is reduced by 30% with meander structure etched on the conventional PIFA. Diversity performances of a parallel dual-element Meander PIFA array...
This work presents performance evaluation results for four 2 ?? 2 multiple-input-multiple-output (MIMO) prototype antenna configurations with different antenna element spacings and polarization properties. The prototypes are based on a size optimized planar inverted-F antenna (PIFA) element which applies a meander structure etched on the metallic patch. Anechoic and reverberation chamber measurements...
This work proposes an antenna design based on a size optimized planar inverted-F antenna (PIFA) with meander structure for multiple-input-multiple-output (MIMO) handset applications. Two elements orientations on half PCB, which cover different translations and rotations, are investigated in terms of diversity performance. A highly efficient parallel dualelement meander PIFA array prototype is implemented...
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