Root Raised Cosine Filter

This filter is a convenience wrapper for a FIR filter and a firdes taps generating function.

Parameters

(R): Run-time adjustable

FIR Type

options: [Complex->Complex (Decimating), Complex->Complex (Interpolating), Float->Float (Decimating), Float->Float (Interpolating)]

Decimation or Interpolation

decimation or interpolation factor (depending on which type is chosen above).

Gain (R)

Overall gain of filter (default 1.0)

Sample Rate (R)

Sample rate in samples per second.

Symbol Rate (R)

Symbol rate, must be a factor of sample rate. Typically ((samples/second) / (samples/symbol)).

Alpha (R)

Excess bandwidth factor, also known as alpha. (default: 0.35)

Num Taps (R)

Number of taps (default: 11*samp_rate)

Example Flowgraph

This flowgraph can be found at [1]. Two Root Raised Cosine Filters in series produce a Raised Cosine Filter which is used for keying waveform shaping, thereby reducing key clicks.

Source Files

C++ files

[2]

Header files

TODO

Public header files

Taps creation

Filter definition

Block definition

[3]