Software for wireless broadband system design

The paper looks at the software of leading companies in the field of wireless broadband systems development. The basic characteristics of appropriate software and design systems are shown including the most typical examples for their implementation.

A comparative study of complex multiple-band noise-shaping sigma-delta modulators for multi-tone input signals

This paper presents a comparative study of complex single-bit and multi-bit sigma-delta modulators that are capable of providing concurrent multiple-band noise-shaping for multi-tone narrow-band input signals. The concepts applied for the three design methodologies are based on the noise transfer functions of complex comb, complex slink and complex multi-notch filters.