Digital Modulations using Matlab: Build Simulation Models from Scratch by Mathuranathan Viswanathan

Author:Mathuranathan Viswanathan [Viswanathan, Mathuranathan]
Language: eng
Format: azw3
Published: 2017-06-22T04:00:00+00:00

Based on the gaussianLPF function , given above, we can compute and plot the impulse response h(t) and the response to an isolated unit rectangular pulse - g(t). The resulting plot is shown in Figure 2.32.

Fig. 2.32: Gaussian LPF:(a) impulse response and (b) response to isolated rectangular pulse

2.11.2 Quadrature implementation of GMSK modulator

Different implementations of a GMSK transmitter are possible. For conventional designs based on CPM representation, refer [11]. Quadrature design is another implementation for GMSK modulator that can be easily realized in software. The quadrature modulator for GMSK, shown in Figure 2.33, is readily obtained from Continuous Phase Modulation representation as

(2.37)

where, b(t) is a Gaussian filtered NRZ data waveform sequence defined as

(2.38)

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