Data rates in the upcoming 3G long term evolution
(LTE) standard will be manifold when compared to the current
universal mobile telecommunications system. Implementing
receivers conforming with the high-capacity transmission techniques
is challenging due to the complexity and computational
requirements of algorithms. In this study, the software defined
radio (SDR) is targeted and the four essential baseband functions
of the 3G LTE receiver, namely, list sphere decoding, fast
Fourier transform, QR decomposition, and turbo decoding, are
addressed and the functions are implemented as application specific
processors (ASPs). As a result, the design space that
describes the essential computational challenges of 3G LTE
receivers is clarified and estimates of area, power, and interprocessor communication buffer requirements are presented.

Perttu Salmela

Juho Antikainen

Teemu Pitkänen

Olli Silvén

Jarmo Takala

3G Long Term Evolution Baseband Processing with Application-Specific Processors

Software-defined radio requires the combination of software-based signal processing and the enabling hardware components. In this paper, we present an overview of the criteria for such platforms and the current state of development and future trends in this area. This paper will also provide details of a high-performance flexible radio platform called the 
                  maynooth adaptable radio system (MARS) that was developed to explore the use of software-defined radio concepts in the provision of infrastructure elements in a telecommunications application, such as mobile phone basestations or multimedia broadcasters.

Ronan Farrell

Magdalena Sanchez

Gerry Corley

Software-Defined Radio Demonstrators: An Example and Future Trends

Digital video broadcast-terrestrial 2 (DVB-T2) is the successor of DVB-T standard that allows a two-dimensional multiplexing of broadcast services in time and frequency domains. It introduces an optional time-frequency slicing (TFS) transmission scheme to increase the flexibility of service multiplexing. Utilizing statistical multiplexing (StatMux) in conjunction with TFS is expected to provide a high performance for the broadcast system in terms of resource utilization and quality of service. In this paper, a model for high-definition video (HDV) traffic is proposed. Then, utilizing the proposed model, the performance of StatMux of HDV broadcast services over DVB-T2 is evaluated. Results of the study show that implementation of StatMux in conjunction with the newly available features in DVB-T2 provides a high performance for the broadcast system.

Mehdi Rezaei

Imed Bouazizi

Moncef Gabbouj

Statistical Time-Frequency Multiplexing of HD Video Traffic in DVB-T2

We present novel algorithms for adaptive GOP size control in distributed Wyner-Ziv video coding, where an H.264 video codec is used for intracoding of key frames. The proposed algorithms rely on theoretical calculations to estimate the bit rate necessary for the successful decoding of Wyner-Ziv frames without the need for a feedback channel, which makes the system suitable for broadcasting applications. Additionally, in regions where H.264 intracoding outperforms Wyner-Ziv coding, the system automatically switches to intracoding mode in order to improve the overall performance. Simulations results show a significant gain in the average PSNR that can reach 3 dB compared to pure H.264 intracoding, and 0.8 dB compared to fixed-GOP Wyner-Ziv coding.

Charles Yaacoub

Joumana Farah

Béatrice Pesquet-Popescu

New Adaptive Algorithms for GOP Size Control with Return Channel Suppression in Wyner-Ziv Video Coding

Systematic lossy error protection (SLEP) is a robust error resilient mechanism based on principles of Wyner-Ziv (WZ) coding for video transmission over error-prone networks. In an SLEP scheme, the video bitstream is separated into two parts: a systematic part consisting of a video sequence transmitted without channel coding, and additional information consisting of a WZ supplementary stream. This paper presents an adaptive SLEP scheme in which the WZ stream is obtained by frequency filtering in the transform domain. Additionally, error resilience varies adaptively depending on the characteristics of compressed video. We show that the proposed SLEP architecture achieves graceful degradation of reconstructed video quality in the presence of increasing transmission errors. Moreover, it provides good performances in terms of error protection as well as reconstructed video quality if compared to solutions based on coarser quantization, while offering an interesting embedded scheme to apply digital video format conversion.

Marie Ramon

Fran&#231;ois-Xavier Coudoux

Marc Gazalet

An Adaptive Systematic Lossy Error Protection Scheme for Broadcast Applications Based on Frequency Filtering and Unequal Picture Protection

About this journal

International Journal of Digital Multimedia Broadcasting provides a forum for engineers and researchers whose interests are in digital multimedia broadcasting to share recent developments and challenges in order to design new and improved systems.

Journal profile

Meet the editorial board

International Journal of Digital Multimedia Broadcasting maintains an Editorial Board of practicing researchers from around the world, to ensure manuscripts are handled by editors who are experts in the field of study.

Editor spotlight

Submit your proposal

Do you think there is an emerging area of research that really needs to be highlighted? Or an existing research area that has been overlooked or would benefit from deeper investigation? Raise the profile of a research area by leading a Special Issue.

Special Issues

Author guidelines

Editorial board

Databases and indexing

International Journal of Digital Multimedia Broadcasting - Table of contents 2009

International Journal of Digital Multimedia Broadcasting | Hindawi

title

International Journal of Digital Multimedia Broadcasting provides a forum for engineers and researchers whose interests are in digital multimedia broadcasting to share recent developments and challenges in order to design new and improved systems.

description

International Journal of Digital Multimedia Broadcasting

https://images.hindawi.com/journals/ijdmb/ijdmb.banner.jpg

International Journal of Digital Multimedia Broadcasting