LAPLACIAN FILTERED MINIMUM SHIFT KEYING

Amplitude Shift Keying & Frequency Shift Keying

Aim: To generate and demodulate an amplitude shift keyed (ASK) signal and a binary FSK signal. Amplitude shift keying-ASK-in the context of digital communications is a modulation process, which imparts to a sinusoid two or more discrete amplitude levels. These are related to the number of levels adopted by the digital message. For a binary message sequence there are two levels, one of which is ...

Zero-Crossing Based Demodulation of Minimum Shift Keying

Minimum shift keying (MSK) modulation has features such as constant envelope, compact spectrum and good error performance, which are all desirable in many digital applications including mobile radio. Numerous receiver structures to demodulate MSK have been suggested, such as correlation receivers, differential detectors and frequency discriminators. MSK is a form of biphase keying and can be de...

A Baseband Pulse Shaping Filter for Gaussian Minimum Shift Keying

Gaussian pulse shaping is used in digital communication systems like DECT, GSM,WLAN to minimize the out of band spectral energy. The baseband rectangular pulse stream is passed through a lter with a Gaussian impulse response before frequency modulating the carrier. Traditionally this is done by storing the values of the pulse shape in a ROM and converting it to an analog waveform with a DAC fol...

Bandwidth-Efficient Modulation Through Gaussian Minimum Shift Keying

Ergodic Cmos Shift Keying

A new method to decode digital information coded onto a chaotic signal is introduced. It is designed for large spreading factors. It is based on the ergodicity of the chaotic system. This allows a partially analytical analysis of the system. An example using a one-dimensional map is elaborated in detail. The performance of this example is not yet competitive with classical systems for an AWGN c...