Digital Single-Sideband Modulation

Singh, Shobha; Renner, K.; Gupta, S. C.

doi:10.1109/tcom.1973.1091638

Cited by 8 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the publication of [6], and the use of polyphase networks [11], what might be called the classic age, starting in about 1968 and continuing through about 1982 and probably dying out a year or so later, of digital transmultiplexers using single sideband channels emerged, and many improvements and modifications in designs and implementations thereof were explored [7][8][9][10][12][13][14][15][16][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][65][66][67], with significant numbers of these resulting in commercial equipment. Some novel ideas such as the use of wave digital filters [40][41][42][43][44]62,63], directional filters [64] and spread spectrum modulation were also explored and implemented [63].…”

Section: Concluding Discussionmentioning

confidence: 99%

“…The prototype filter transition bandwidth at each level is given by Eq. (10), and the filter is designed to have equal minima of attenuation in the stopband. Each prototype filter is a square root Nyquist filter.…”

Section: Description Of the Second Design Methodsmentioning

confidence: 99%

“…Based on results in [4,5] Darlington [6] ushered in what it seems appropriate to call the classical age of digital transmultiplexers, from about 1969 through about 1982, by designing the first digital single sideband (SSB) modulators for multiple parallel channels. Various improvements in the designs of SSB transmultiplexers, such as more efficient hardware, filtering and processing, followed in quick succession [7][8][9][10]. The digital SSB system described in [10] can be used in radio communications and telemetering as well as in channel banks.…”

Section: The Classical Age Of Digital Transmultiplexer Designmentioning

confidence: 99%

“…Various improvements in the designs of SSB transmultiplexers, such as more efficient hardware, filtering and processing, followed in quick succession [7][8][9][10]. The digital SSB system described in [10] can be used in radio communications and telemetering as well as in channel banks. These SSB transmultiplexers were the best efforts at the time, using digital filters, at using the spectrum efficiently.…”

Section: The Classical Age Of Digital Transmultiplexer Designmentioning

confidence: 99%

See 3 more Smart Citations

Designs and architectures of filter bank trees for spectrally efficient multi-user communications: review, modifications and extensions of wavelet packet filter bank trees

Sablatash¹

2007

SIViP

View full text Add to dashboard Cite

A review is presented first of the evolution of transmultiplexers since about 1966, in the context of a long progression of theoretical advances and developments leading to recent proposals to fundamentally improve OFDM type systems using principles of perfect reconstruction filter (PRF) banks. The equivalence of transmultiplexers to OFDM type multi-user systems is discussed. The desirable goals for performance and implementation of transmultiplexers or multiband, multiuser communication systems that are addressed and met in this paper using filter bank trees are set down. Then modifications and extensions are presented of the designs and architectures of wavelet packet based synthesis and analysis pairs of filter bank trees (Sablatash and Lodge in Digital Signal Process 13: 58-92, 2003) that can be used as transmultiplexers. These exhibit a number of advantages over the previous designs and address three shortcomings of the designs used to illustrate basic principles in Sablatash and Lodge (Digital Signal Process 13:58-92, 2003). The first of these is the asymmetry of the magnitude frequency responses of the multiplexer channels, which is addressed using a symmetric design for a lowpass and highpass quadrature mirror filter (QMF) pair described herein. The second is the problem of minimizing the total delay of the signal in passing through the analysis and synthesis filter banks. This is addressed using an architecture involving DFT polyphase synthesis filter banks to replace the wideband VSB filters at the roots of the two identical synthesis filter bank trees, but results in the multiplexer having fewer levels. In this way a Financial support under Industry Canada's Spectrum Research Funding is gratefully acknowledged.M. Sablatash (tradeoff is effected of lower delay and complexity with fewer levels of bandwidth on demand. At the receiver matching DFT polyphase analysis filters and the other matching analysis filters are implemented. The third shortcoming is the difficulty in designing a synchronization scheme if the filters in the synthesis and analysis filter banks have non-linear phase. This is addressed by designing linear phase filters that do not affect the ISI to any significant degree for communication purposes, although exact perfect reconstruction is lost, but greatly ease and improve the design of the synchronization scheme. Relationships of this paper and its advantages over recent research studies and IEEE 802.22 standards proposals using PR filter banks for multi-user systems to greatly improve on OFDM systems are discussed.

show abstract

Section: Concluding Discussionmentioning

confidence: 99%

Section: Description Of the Second Design Methodsmentioning

confidence: 99%

Section: The Classical Age Of Digital Transmultiplexer Designmentioning

confidence: 99%

Section: The Classical Age Of Digital Transmultiplexer Designmentioning

confidence: 99%

See 2 more Smart Citations

Designs and architectures of filter bank trees for spectrally efficient multi-user communications: review, modifications and extensions of wavelet packet filter bank trees

Sablatash¹

2007

SIViP

View full text Add to dashboard Cite

show abstract

Broadband RF Transmission and Modulation

Yee¹

1998

Low-Power CMOS Wireless Communications

View full text Add to dashboard Cite

The Design Of Digital Single-sideband Modulators Using A Multirate Digital Filter

Williams¹,

Leon²

1977 11th Asilomar Conference on Circuits, Systems and Computers, 1977. Conference Record.

View full text Add to dashboard Cite

One Space P a r k .Redondo Beach, California SUMMARY The translation from time division multiplexed data f o r m a t s to frequency division multiplexed data formats is considered. menting the translation a r e presented. sent three types of digital single-sideband modulation. I t i s shown that the design of the three translators can be reduced to a computationally-efficient form of a multirate digital filter. Seven f o r m s of implementing the multirate digital filter a r e developed. The parall e l f o r m s a r e shown to be the l e a s t sensitive to coefficient e r r o r s . However, it i s noted that the direct f o r m s a r e not so sensitive a s to be impractical to i mplement. This i s singificant because single-rate, direct form f i l t e r s with narrow passbands and s h a r p transition regions a r e usually much too sensitive to coefficient e r r o r s to be considered practical. Basic results that a r e used i n the analysis and design of the multirate digital filters a r e derived. A 12-channel TDM-FDM translator design example i s presented. This example introduces a simulation and analysis program (SANDS) which i s used to evaluate the TDM-FDM translator performance.Three methods of efficiently impleThese r e p r e - 1, INTRODUCTIONTwo methods of combining many information channels for efficient transmission a r e i n wide use today: time division multiplexin TDM) and frequency division multiplexing (FDM).fl() FDM h a s been used by the telephone companies for many y e a r s . Improvem e n t s i n digital technology i s increasing the use of TDM. tion for many y e a r s and a means of translatingbetween them i s needed. tation of digital TDM-to-FDM translators.It appears that both methods will be i n operaThis paper examines the implemenSection 2 p r e s e n t s a unified approach to the prob-The problem based on the implementation of three types of digital SSB (single-sideband) modulators. lem i s reduced to designing a special type of multirate digital filter. filter and presents guidelines f o r i t s implementation. The hardware requirements for the three types of SSB modulators a r e compared. of a i2-channel TDM-FDM translator.Section 3 discusses the design of the Section 4 gives an example DIGITAL TDM TO FDM TRANSLATORSA digital TDM to FDM translator i s i n a functional sense a digital SSB modulator. separated into N channels which a r e then SSB modulated to N different frequency slots to form an FDM signal. To provide economic competition to analog techniques, the digital SSB modulators m u s t be highly efficient in their use of digital hardware. Three types of digital SSB modulators a r e presented. These a r e derived from the three methods of generating SSB signals that employ linear time-invariant filters:(2) the Weaver modulator, (4) the Hartley (phase splitting) modulator, ( 7 ) and the bandpass filter type SSB modulator. The TDM input i s The mathematical formulation of the SSB signal i s CH1315-1/78/0000-0184$00.75 ( c ) 1978 IEEE Electrical Engineering Dept. W. Lafayette, In...

show abstract

Digital Single-Sideband Modulation

Cited by 8 publications

References 5 publications

Designs and architectures of filter bank trees for spectrally efficient multi-user communications: review, modifications and extensions of wavelet packet filter bank trees

Designs and architectures of filter bank trees for spectrally efficient multi-user communications: review, modifications and extensions of wavelet packet filter bank trees

Broadband RF Transmission and Modulation

The Design Of Digital Single-sideband Modulators Using A Multirate Digital Filter

Contact Info

Product

Resources

About