Walter Godoy

Learn More
—This paper proposes an information-set based soft-decision decoding algorithm for binary linear block codes. In this new algorithm a list of symbol positions that are able to generate a valid information set is obtained, in advance, by using pre-processing. During the decoding process, the algorithm reconstructs a code-word by means of the information sets(More)
As the internet users are increasing day by day because it is easy to transfer digital data between end users. By this new problem of data piracy has increased. There are different methods of watermarking has been proposed for protecting the digital data like video, audio, image, etc. There are number of researchers still working in the era of digital video(More)
Cognitive radio ad hoc systems can coexist with a primary network in a scanning-free region, which can be dimensioned by location awareness. This coexistence of networks improves system throughput and increases the efficiency of radio spectrum utilization. However, the location accuracy of real positioning systems affects the right dimen-sioning of the(More)
This paper has four main goals: (i) to describe in detail a new architecture to implement soft-decision, information-set-based decoders purely in hardware; (ii) to investigate the effects of quantization of the received word on the decoder performance, calculating the minimum number of bits that should be adopted; (iii) to present a strategy for optimizing(More)
This is an extension algorithm previously presented in [1] for decoded modulation systems with block codes for 8-PSK and 16-PSK constellations. The proposed algorithm presents a search mechanism of the least reliable points from the first code array and generate vectors for the Modified BCM, ZNA decoder, described in [1]. It is also presented a mapping of(More)
  • 1