The bandwidth of digital data signal

Amoroso, F.

doi:10.1109/mcom.1980.1090291

Cited by 96 publications

(41 citation statements)

References 11 publications

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“…We considered two different fractional energy containment bandwidth definitions [1], [6] for the sake of characterizing these time-limited waveforms. It is conceptually appealing to define the fractional energy containment bandwidth [1] as the normalized frequency W that satisfies…”

Section: Tc ) U(t)mentioning

confidence: 99%

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On the performance of band-limited asynchronous DS-CDMA over nakagami-m channels

Hua

Yang

Hanzo

2006

IEEE Trans. Wireless Commun.

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Abstract-In this paper we investigated the BER performance of DS-CDMA using various chip-waveforms, which include three time-limited chip-waveforms and two band-limited chipwaveforms. Closed-form formulae were derived for evaluating the achievable bit-error rate performance with the aid of the standard Gaussian approximation, when communicating over a Nakagami-m channel. The time-limited waveforms impose a low implementational complexity, since they maybe oversampled and read from a look-up table. However, they are outperformed by the frequency-domain raised-cosine waveform as well as the optimum waveform specifically designed by Cho and Lehnert for achieving the lowest possible bit error rate.

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Section: Tc ) U(t)mentioning

confidence: 99%

“…In [1], Amoroso introduced various definitions of the bandwidth of digital signalling schemes. In the context of CDMA based communications [2], numerous valuable studies have been conducted [3]- [7] for the sake of finding various attractive chip waveforms.…”

Section: Introductionmentioning

confidence: 99%

On the performance of band-limited asynchronous DS-CDMA over nakagami-m channels

Hua

Yang

Hanzo

2006

IEEE Trans. Wireless Commun.

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“…We considered the fractional energy containment bandwidth defiLr -1 nitions of [15,16] for the sake of characterizing these time-limited Zk S Zkl. (19) waveforms.…”

Section: Las-cdma Using Various Time Domain Chip-waveforms H Wei Andmentioning

confidence: 99%

“…The width of the IFW was t = 3T' and the maximum asynchronous delay difference of the uplink mobile E EEE]E E E E E E E E E E E E E E E E E E E E E-l transmitters was Tm = 2TC, while the negative exponential MIP io-v decay factor was T = 0.2. code based classic CDMA and LAS CDMA, when communicating when communicating over different fading channels associated over a Nakagami-m channel having m =1. The energy containwith different Nakagami fading parameters m. The energy conment requirement was satisfied according to the strictly bandlimtainment requirement was satisfied according to the strictly banited condition [15,16] of 99.9950% and the total bandwidth was dlimited condition [15,16] of 99.995%o and the total bandwidth G(1 + J3) =600. was G(1 + J3)=600.…”

Section: Las-cdma Using Various Time Domain Chip-waveforms H Wei Andmentioning

confidence: 99%

LAS-CDMA using various time domain chip-waveforms

Huang

Hanzo

2005

6th IEE International Conference on 3G and Beyond (05/11182)

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ABSTRACTing code and those of an LS (4,8,8) [3] code. Li [2,5] proposed LAS CDMA exhibits a significantly better performance than the employment of the so-called LAS codes, which exhibit zero that of classic random code based DS-CDMA, when operating auto-correlation and cross-correlation in a limited-offset range of in a quasi-synchronous scenario. Classic frequency-domain [-l, t]-chips. In [6,7] the authors of this contribution investigated raised cosine Nyquist filtering is known to show the best possible performance, but its complexity may be excessive in high-150-LAS code chip-rate systems. Hence in these systems often low-complexity . .Traditional spreading code time-domain waveform shaping is considered. Motivated by this fact, the achievable performance of LAS-CDMA is investigated in conjunction with three different time-limited chip-

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“…Since we are restricting our attention to time limited signals, there is some freedom in the definition of bandwidth. Two common notations which are applicable to this channel are the fractional out of band energy (FOBE) [4] and the root mean squared (RMS) bandwidth [5] (see also [6]). We will also consider the fourth order moment bandwidth measure introduced in [7].…”

Section: B Bandwidth Constrained Signalsmentioning

confidence: 99%