XXX Simpósio Brasileiro de Telecomunicações

This paper addresses a new possible combination of the single carrier (SC) block transmission and the Code Division Multiple Access (CDMA) techniques. Performance comparisons with the traditional SC CDMA block transmission system are presented. A key feature of the proposed transmission technique is that, differently from what occurs with SC CDMA,...

In this paper, we present a Connection Admission Control (CAC) algorithm for the IEEE 802.16e standard, based on dynamic bandwidth reservation. These reserves are obtained by segmenting the amount of the available channel’s bandwidth by thresholds, which are dynamically adjusted according to the admissions of handoff and new connections. Studies...

The aim of this paper is to propose a new PAPR reduction technique for OFDM system based on the permutations of the lines of the Walsh Hadamard Transform. This new technique is called SLM-WHT. The PAPR reduction efficiency and the reduction of the symbol error rate in non- linear channels have been evaluated using computational simulation, allowing...

This paper presents an analysis of speech signals based on quantification measures of recurrence plots. A com- parison between healthy voices and voices affected by laryngeal pathologies (Reinke’s edema, nodule and vocal fold paralysis) is made. In order to classify these signals as pathological or healthy, seven recurrence quantification measures...

In this paper we compare two different approaches to tackle the regenerator placement and link capacity optimiza- tion joint problem in translucent optical networks. The former and simpler proposal imposes the same number of wavelengths to all links, whereas the number of wavelengths can be defined for each link in the second proposal. We used the...

Wireless Sensor Networks are being increasingly recommended for use in noisy industrial environment. An interes- ting standard to be used is IEEE 802.15.4, but it does not have the appropriate mechanisms to meet all requirements of industrial communications. Thus, this paper presents an expansion in the use of this standard, and presents three...

This paper proposes a method to estimate the signal propagation behavior of a digital TV. A measurement campaign was carried out in the metropolitan region of Belém for digital TV signal study. The proposed method uses a well- known geological tool, the kriging method. This method has the statistical robustness as its main feature.

This paper introduces an extension of a methodology for calculating the throughput in cognitive radio networks with infrastructure and using the technique Slotted Aloha for medium access. This extension to the model includes the effects of packet error rate due to interference on the network, an effect not considered in the original model.

Recently, some authors have addressed the encoding of biological signals as two-dimensional arrays, in such a way that intra and intersegment dependencies are exploited by off- the-shelf image encoders. However, the rearrangement in a 2-d array itself provides a poor correlation across signal segments, which has the potential to reduce the...

This paper presents a study of acoustic emotion recognition and its effects on speaker recognition systems. Mul- tistyle emotion identification experiments were performed using a feature based on the glottal pulse symmtery, which is estimated from the source excitation signal, and compared with the results achieved by the CB-TEO-Auto-Env feature....