Spectra of Digital FM

Anderson, R. R.; Salz, J.

doi:10.1002/j.1538-7305.1965.tb04173.x

Cited by 79 publications

(16 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is emphasised that in this paper only the above special case of multilevel frequency shift keying is considered and the term M-ary CPFSK is used exclusively to refer to the above special case. In 1960s, Salz [1] and, Anderson and Salz [2] pointed out that the power spectra of these special cases of digital frequency-modulated (FM) signals are confined to a relatively narrow band. Moreover in Reference 1, Salz considered the limiter-discriminator detection of M-ary CPFSK and showed that the performances asymptotically approach the performances of M-ary differentially coherent phase shift keyed signals (DPSK) at high signal/noise ratios (SNR).…”

Section: Introductionmentioning

confidence: 98%

M-ary continuous phase frequency shift keying with modulation index 1/M

Ekanayake

1984

IEE Proc. F Commun. Radar Signal Process. UK

View full text Add to dashboard Cite

In the paper, two techniques for the detection of multilevel continuous phase frequency shift keyed signals with modulation index equal to the inverse of the number of levels (M-ary CPFSK) are described. The first technique is a noncoherent technique which is similar to the conventional differentially coherent detection method of DPSK and the error rate of this detector is equal to the error-rate in DPSK. The second technique is a coherent technique which utilises a coherent carrier, and the detection method is similar to the coherent detection and differential decoding of differentially encoded PSK. The error rate in this case is equal to the error rate in coherent-detection/differential-decoding of PSK. Finally, expressions are derived for the autocorrelation functions and the power spectral density functions of M-ary CPFSK. By numerical computation, it is shown that M-ary CPFSK have approximately the same autocorrelation function and approximately the same power spectral density function regardless of the number levels when M ^ 4. The power spectral characteristics of M-ary CPFSK are compared with those of M-ary PSK.

show abstract

Section: Introductionmentioning

confidence: 98%

M-ary continuous phase frequency shift keying with modulation index 1/M

Ekanayake

1984

IEE Proc. F Commun. Radar Signal Process. UK

View full text Add to dashboard Cite

show abstract

“…8 shows the PSD of the proposed continuous-phasemodulated F-QPSK-B signal, taking the truncation length of g(t) L as a parameter. In order to calculate the PSDs, except that of the I/Q modulated F-QPSK-B signal [14], the method proposed by Anderson and Salz [22] is used. In Fig.…”

Section: Fig 8 Psd Of the Continuous-phase-modulated F-qpsk-b Signamentioning

confidence: 99%

“…The throughput is defined as the reciprocal ratio of the frequency band around the carrier frequency containing 99% of the signal power to the data rate. In order to calculate the 99% bandwidth, the analytical calculation of the PSD is used [22]. Note that the F-QPSK-B achieves the higher throughput than the selected CPM schemes without the loss of much power efficiency.…”

Section: B Performance Comparison Of Cpm Of F-qpsk-b Withmentioning

confidence: 99%

Continuous Phase Modulation of F-QPSK-B Signals

Park

Lee

Feher³

2007

IEEE Trans. Veh. Technol.

View full text Add to dashboard Cite

Abstract-A continuous phase modulation (CPM) implementation alternative of a recently standardized class of Feher-patented quadrature phase-shift keying (F-QPSK-B) modulation is proposed. Based on the fact that the F-QPSK-B signal has a quasiconstant envelope and continuous phase characteristics, it is shown that it can indeed be generated by the CPM scheme. For example, an F-QPSK-B signal can be fully generated using an existing FM-based transmitter with a modulation index of 0.5.

show abstract

“…The CPQFSK bandwidths were taken from curves in [.32J . General expressions for continuous-phase FSK spectra are given in [32,33 ] .…”

Section: Signal Bandwidthsmentioning

confidence: 99%

“…However, MSK generally has a much smaller fraction of out-of-band energy than QPSK [5 ] . The spectrum of CPQFSK is also quite compact because of the minimum signaling frequency separation for orthogonality and the phase continuity [31,32] . This statement may be an assumption of fact, where K 1 is a 9-digit integer, and a polar method for normal deviates [35].…”

Section: Signal Bandwidthsmentioning

confidence: 99%

Simulation of a Narrow Bandpass-Limited Satellite Channel

White¹

1976

View full text Add to dashboard Cite

The effects of a bandpass-limiting satellite channel, such as a B=25-kHz hard-limiting FLEETSAT channel, on several modulation techniques were simulatedThe modulations included BPSK and various forms of QPSK, including offset QPSK and continuous-phase minimum frequency shift keying (MSK). Coherent matched-filter receivers and both uplink and downlink noise were assumed.For a bit error probability of 0.005 and a SNR loss of less than 1 dB caused by the nonlinearity in the FLEETSAT case, the maximum standard data rate R was 19.2 kbps for BPSK but 32 kbps for offset QPSK, MSK and QPSK.Rates of 24 kbps for BPSK and 48 kbps for offset QPSK and MSK were attainable at this same reliability with a SNR degradation of about 4 dB and 2.5 dB, respectively. Larger degradations are expected at lower error rates.

show abstract

Spectra of Digital FM

Cited by 79 publications

References 4 publications

M-ary continuous phase frequency shift keying with modulation index 1/M

M-ary continuous phase frequency shift keying with modulation index 1/M

Continuous Phase Modulation of F-QPSK-B Signals

Simulation of a Narrow Bandpass-Limited Satellite Channel

Contact Info

Product

Resources

About