Journal ArticleDOI
Experimental Results on Constant Envelope Signaling with Reduced Spectral Sidelobes
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TLDR
Analytic techniques have been developed which predict probabilistically (without dependence on simulation) the power spectral density that results from pulse modification combined with hard limiting where necessary to achieve constant envelope.Abstract:
Considerable recent attention has been given to the use of pulse modification to reduce spectral sidelobes in constant envelope data transmission within the "offset" modulation format that includes offset QPSK and MSK. Analytic techniques have been developed which predict probabilistically (without dependence on simulation) the power spectral density that results from pulse modification combined with hard limiting where necessary to achieve constant envelope. Here the computational results are compared with experimental results. Agreement between theory and experiment is seen to be good. The implications for bandwidth efficiency and communication efficiency are discussed.read more
Citations
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Journal ArticleDOI
Continuous phase modulation
TL;DR: A number of methods for constructing constant amplitude signals which significantly outperform MSK are considered, and at what level of complexity these improvements are obtained and realized.
Journal ArticleDOI
Adaptive A/D Converter to Suppress CW Interference in DSPN Spread-Spectrum Communications
TL;DR: The non-Gaussian nature of CW interference is exploited to suppress the CW via the A/D converter following chip demodulation in a direct sequence pseudonoise (DSPN) communication link and the modulation is coherent BPSK.
Patent
High precision, low phase noise synthesizer with vector modulator
TL;DR: In this article, the authors present an apparatus for generating a modulated signal which includes a modulator operative for receiving a first signal and input data signals, and modulating the first signal in accordance with the inputs data signals so as to produce a modified reference signal; a first frequency divider coupled to the modulator output, operative to reduce the frequency of the modulated reference signal by a predetermined factor.
Proceedings ArticleDOI
The error vector and power amplifier distortion
TL;DR: In this paper, the relationship between the amplifier distortion and the error vector at the output has been investigated for a class AB amplifier and /spl pi/4 DQPSK signals.
Journal ArticleDOI
Serial MSK-Type Detection of Partial Response Continuous Phase Modulation
Arne Svensson,C.-E. Sundberg +1 more
TL;DR: It is shown that, assuming perfect phase and time synchronization, the serial and parallel receivers have equal performances and the advantages of the serial receiver over the parallel receiver are the same for partial response continuous phase modulation.
References
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Journal ArticleDOI
Simplified MSK Signaling Technique
F. Amoroso,J. Kivett +1 more
TL;DR: Modulation and demodulation in the minimum (frequency)-shift keying (MSK) format are reduced to the form of coherent biphase keying, demonstrating the feasibility of synthesizing the one filter that is unique to this signaling scheme.
Journal ArticleDOI
The bandwidth of digital data signal
TL;DR: The purpose of the present article is to explore the subject of data transmission bandwidth through an examination of its various definitions, as the spectrum is finite, yet as technology manipulates it, a dazzling increase in bandwidth capability emerges.
Journal ArticleDOI
The Use of Quasi-Bandlimited Pulses in MSK Transmission
TL;DR: A new class of basic pulses is introduced into the MSK signaling format to gain improvements in the out-of-band power spectral density characteristic.
Journal ArticleDOI
Power Spectrum of Angle Modulated Correlated Digital Signals
TL;DR: It is shown that for some well-known baseband encoding schemes, such as bipolar, pair selected ternary, high density bipolar, and bipolar with n zeros substitution, the spectrum exhibits lines no matter what the value of the modulation index.