FOBTV-13-01 1Abstract-This paper reviews the main technical solutions adopted by the next generation mobile broadcasting standard DVB-NGH, the handheld evolution of the second generation digital terrestrial TV standard DVB-T2. The main new technical elements introduced with respect to DVB-T2 are: layered video coding with multiple physical layer pipes, time-frequency slicing, full support of an IP transport layer with a dedicated protocol stack, header compression mechanisms for both IP and MPEG-2 TS packets, new LDPC coding rates for the data path (down to 1/5), non-uniform constellations for 64QAM and 256QAM, fourdimensional rotated constellations for QPSK, improved time interleaving in terms of zapping time, end-to-end latency and memory consumption, improved physical layer signaling in terms of robustness, capacity and overhead, a novel distributed MISO transmit diversity scheme for SFNs, and efficient provisioning of local content in SFNs. All these technological solutions, together with the high performance of DVB-T2, make DVB-NGH a real next-generation mobile multimedia broadcasting technology. In fact, DVB-NGH can be regarded the first third-generation broadcasting system because it allows for the possibility of using multiple input multiple output MIMO antenna schemes to overcome the Shannon limit of single antenna wireless communications. Furthermore, DVB-NGH also allows the deployment of an optional satellite component forming a hybrid terrestrial-satellite network topology to improve the coverage in rural areas where the installation of terrestrial networks could be uneconomical. to Handheld) [4], were developed to support large scale consumption of mass multimedia services such as mobile television (TV). However, the adoption of mobile TV services did not fulfill the initial expectations due to the lack of a successful business model and the high costs associated to the deployment of new mobile broadcasting networks. Today, a new generation of mobile broadcasting technologies is emerging due to the continuously increasing requirements and expectations of both users and operators, incorporating the latest advances in wireless communications which provide significant capacity and coverage performance improvements compared to first generation mobile broadcast systems. IndexDVB-NGH (Next Generation Handheld) [5] is the handheld evolution of DVB-T2 (Terrestrial 2nd Generation) [6], the most advanced digital terrestrial TV (DTT) technology in the world, offering more robustness, flexibility and at least 50% more spectrum efficiency than any other technology [7].DVB-NGH was created with the objective of becoming the reference mobile multimedia broadcasting standard. However, DVB-NGH not only succeeds significantly outperforming existing mobile broadcasting technologies in terms of capacity and coverage, but also optimizing DVB-T2 in many aspects. Furthermore, DVB-NGH is the first broadcasting system to incorporate Multiple-Input Multiple-Output (MIMO) antenna schemes as the key technology to overcome the S...

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The successor to the DVB-H broadcast handheld standard (DVB-NGH) is currently being defined by the DVB-TM-H working group. A key feature which would distinguish the new standard from the old is the likely inclusion of cross-polar transmission and reception for increased capacity and robustness through twinantenna MIMO schemes. To enable simulations of the various proposals to be carried out, a channel sounding campaign took place in July 2010 in Helsinki, Finland, focussing on cross-polar UHF transmission and reception. A number of practical designs for antennas suitable for a handheld terminal were included in the trial and all test data was obtained via these devices. Following the campaign, analysis of the data has produced a simple model for both outdoor and indoor scenarios of the antenna-inclusive 2-by-2 channel. This paper briefly describes the excitation signal and test arrangements before introducing the form of the channel model. Finally the actual parameters of the model which have resulted from the measurements are discussed and related to the likely observable behaviour of the NGH cross-polar signal.

We study channel pre-inversion and vector perturbation (VP) schemes for large-scale broadcast channels, wherein a transmitter has M transmit antennas and is transmitting to K single-antenna non-cooperating receivers. We provide results which predict the capacity of MMSE pre-inversion as K → ∞. We construct a new VP strategy, max-SINR vector perturbation (MSVP), which maximizes a sharp estimate of the signal-tointerference-plus-noise ratio. We provide results which predict the performance of MSVP and demonstrate that MSVP outperforms other VP methods. Lastly, we combine MSVP with the low-complexity Sorted QR Precoding method to show that MSVP has the potential to efficiently deliver data to a very large number of users at close to channel capacity.

Abstract-In this paper we consider strategies for MIMO interference channels which combine the notions of interference alignment and channel pre-inversion. Users collaborate to form data-sharing groups, enabling them to clear interference within a group, while interference alignment is employed to clear interference between groups. To improve the capacity of our schemes at finite SNR, we propose that the groups of users invert their subchannel using a regularized Tikhonov inverse. We provide a new sleeker derivation of the optimal Tikhonov parameter, and use random matrix theory to provide an explicit formula for the SINR as the size of the system increases, which we believe is a new result. For every possible grouping of K = 4 users each with N = 5 antennas, we completely classify the degrees of freedom available to each user when using such hybrid schemes, and construct explicit interference alignment strategies which maximize the sum DoF. Lastly, we provide simulation results which compute the ergodic capacity of such schemes.