Raised cosine FIR pulse-shaping filter design

returns
the coefficients, `b`

= rcosdesign(`beta`

,`span`

,`sps`

)`b`

, that correspond to a square-root
raised cosine FIR filter with rolloff factor specified by `beta`

.
The filter is truncated to `span`

symbols, and
each symbol period contains `sps`

samples. The
order of the filter, `sps*span`

, must be even. The
filter energy is 1.

[1] Tranter, William H., K. Sam Shanmugan, Theodore S. Rappaport,
and Kurt L. Kosbar. *Principles of Communication Systems
Simulation with Wireless Applications.* Upper Saddle River,
NJ: Prentice Hall, 2004.

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