An introduction to the fdm-tdm digital transmultiplexer

OpenStax

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1 What is an fdm-tdm transmultiplexer

2 Derivation of the equations for a basic fdm-tdm transmux

2.1 The transmux as a bank of single channel digital tuners

2.2 Fundamental equations for a single-channel digital tuner

2.3 Choosing various system parameters to simplify the general equation for

2.4 Interpretation of the basic tuner equation in terms of the discrete

2.5 Generalization to the fft-based digital transmultiplexer

2.6 The transmux as a dft-based filter bank

2.7 Using the dft as a filter bank

2.8 The implications of attaining the desired bandpass characteristic

2.9 The effect of bin decimation on an fft

2.10 Relationship of the filter bank approach to digital spectrum analysis

2.11 Stylized fortran implementation of a basic fdm-tdm transmux

3 Example: using an fdm-tdm transmux to demodulate r.35 telgraphy signals

4 The impact of digital tuning on the overall design of an fdm-tdm transmux

4.1 Problem statement

4.2 Total computational requirements

4.3 Parameter optimization

4.4 Hardware examples of tuner/transmux tradeoffs

4.5 A single-card supergroup tuner/transmux

4.6 Design of the fsk vft telegraphy demodulator

4.7 Asic-based implementation of fdm group tuning and transmultiplexing

5 General design principles

7.1 Use of optimal, linear phase, equal-ripple design techniques

7.2 Relationship to the design parameter Q

7.3 Continuation of the telegraphy demodulation example

7.4 Implications of the filter design on signal-to-noise ratio and noise

7.5 Example of a voice channel demultiplexer

7.6 Other criteria for filter design

9.1 Structure and spectral description

9.2 Mathematical description of equations

9.3 Relationship between the basic tdm-fdm and fdm-tdm transmultiplexers

9.4 A pair of examples

Source: OpenStax, An introduction to the fdm-tdm digital transmultiplexer. OpenStax CNX. Nov 16, 2010 Download for free at http://cnx.org/content/col11165/1.2

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