The use of mobile data services is in high demand ever since the advent of smartphones and is expected to increase further with the evolution of various services and applications for future mobile devices. This excessive use of data has caused severe bottlenecks within the mobile networks due to overloading. The route towards network upgrades is an expensive one especially due to the high licen...

This paper compares the performance of a Turbo coded OFDM wireless link for SISO, SIMO, MISO and MIMO system with uncoded OFDM wireless link for SISO, SIMO, MISO and MIMO system in the in the presence of rayleigh fading. Turbo encoder encodes the input information bits and sends to QPSK or 16 QAM or 64 QAM modulator. Modulated symbols are mapped by STBC. Outputs of STBC are split into n streams...

| The performance of uncoded PSK schemes over fading channels is only inversely proportional to the signal-to-noise ratio, which is not very reliable for digital communication applications. Improving their performance has been approached by means of coded modulation schemes where code redundancy combined with interleaving introduces some degree of diversity that depends on the complexity of the...

Abstract— A novel PER estimation method based on the Log Likelihood Ratios of a soft output decoder is proposed. Classically, PER estimation based on soft output decoding depends on an estimate of the SNR. The contribution of this paper is a PER estimate that is not biased by such SNR estimation uncertainty. We compare the proposed estimation method with the estimator proposed by Hoher first by...

Recently, video watermarking has become an important research issue due to increase in threats of video piracy, authentication, and ownership integrity. In this paper, we propose a new secure and robust watermarking method for H.264 compressed video stream with a blind extraction process. Most authors prefer embedding in I-frames because I-frames are crucial for video signal. However, the embed...

The fundamental limits of “systematic” communication are analyzed. In systematic transmission, the decoder has access to a noisy version of the uncoded raw data (analog or digital). The coded version of the data is used to reduce the average reproduced distortion D below that provided by the uncoded systematic link and/or increase the rate of information transmission. Unlike the case of arbitra...

The MIMO system can meet the growing demand for higher capacity in wireless communication fields. So far, the authors have reported that, based on channel measurements, uncoded performance of narrowband MIMO spatial multiplexing in indoor line-of-sight (LOS) environments generally outperforms that in non-LOS (NLOS) ones under the same transmit power condition. In space-frequency coded MIMO-OFDM...

We consider the problem of storing a large file or multiple large files in a distributed manner over a network. In the framework we consider, there are multiple storage locations, each of which only have very limited storage space for each file. Each storage location chooses a part (or a coded version of the parts) of the file without the knowledge of what is stored in the other locations. We w...

| The performance of uncoded PSK schemes over fading channels is only inversely proportional to the signal-to-noise ratio, which is not very reliable for digital communication applications. Improving their performance has been approached by means of coded modulation schemes where code redundancy combined with interleaving introduces some degree of diversity that depends on the complexity of the...

Adaptive coded modulation is a powerful method for achieving a high spectral efficiency over fading channels. Recently proposed adaptive schemes have employed set-partitioned trelliscoded modulation (TCM) and have adapted the number of uncoded bits on a given symbol based on the corresponding channel estimate. However, these adaptive TCM schemes will not perform well in systems where channel es...