Spread spectrum access methods for wireless communications

Kohno, Ryuji; Meidan, Reuven; Milstein, L.B.

doi:10.1109/35.339882

Cited by 271 publications

(100 citation statements)

References 34 publications

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“…Each band of the output signal V (f ) depends linearly of the input bands with symbol rate bandwidth ( 1 T ) and spaced by multiples 1 T . The performance of the interference canceller could be enhanced if the input and output bands are divided in subbands of equal bandwidth.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

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Multi‐sensor frequency domain multiple access interference canceller for DS‐CDMA systems

Gonçalves

Gameiro

2007

Trans Emerging Tel Tech

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Abstract-Direct Sequence Code Division Multiple Access (DS-CDMA) signals exhibit cyclostationary properties which imply a redundancy between frequency components separated by multiples of the symbol rate. In this paper a Multiple Access Interference Canceller (Frequency Shift Canceller) that explores this property is presented. This linear frequency domain canceller operates on the spreaded signal in such way that the interference and noise at its output is minimized (Minimum Mean Squared Error Criterium). The Frequency Shift Canceller (FSC) performance was evaluated for a UMTS-TDD scenario and multisensor configurations, where the cases of diversity and beamforming were considered. All these configurations are evaluated concatenated with a parallel interference canceller (PIC-2D). The results are benchmarked against the performance of the conventional RAKE-2D detector, the conventional PIC-2D detector and single user scenario, and we observe considerable performance gains with the FSC specially for the diversity case and a performance close to the single user case when it was evaluated jointly with PIC-2D.

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Section: Theoretical Backgroundmentioning

confidence: 99%

“…where α i,m is a scalar weight factor, G (1) mB (f ) is defined in (6) and superscript (1) refers to the user of interest.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Multi‐sensor frequency domain multiple access interference canceller for DS‐CDMA systems

Gonçalves

Gameiro

2007

Trans Emerging Tel Tech

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“…Though the estimation of interference suppression effects is affected by pulse shapes [4], we remark that the asynchronous is important to design highly efficient mobile communication systems. Our proposal, asynchronous channels (ACL), is a method that aims to utilize such interference suppression effect of the asynchronous access by staggering multiple channels of a user [5].…”

Section: Introductionmentioning

confidence: 99%

Application of Asynchronous Channels Method to the W-CDMA Systems

Nameda¹,

Terai²,

Kao³

et al. 2009

TOCSJ

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Abstract:We evaluate new interference suppression method that utilizes the effect of asynchronous accesses in wireless telecommunication. The method is called as asynchronous channels (ACL), which can be applied to one of the present third generation standards, wideband code division multiple access (W-CDMA) systems. The simulation result shows that the system capacity gains up by 145% in band-unlimited rectangular pulse situations. On the other hand, in practical bandlimited root raised cosine (RRC) pulse situation, ACL applied system performances are inferior to the conventional synchronous channel systems. Because the another band-limited Gaussian pulse simulation shows better interference than synchronous channels, whether the asynchronous channel can have an effect on interference suppression is highly depending on the choice and the design of pulse shaping filters.

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“…with G (1) (f ) being the Fourier transform of g (1) (t) which is the signature waveform of s (1) (t). In those conditions the band m of the signal at the output is…”

Section: Principles Of the Cancellermentioning

confidence: 99%

“…It presents significant advantages over Time Division Multiple Access (TDMA), namely frequency diversity, multipath diversity and more spectrum efficiency on multicell systems [1], which led to its choice as the technology for third generation cellular systems. The first version of third generation CDMA systems will be based on the conventional RAKE receiver, which is known to be limited by the multiple access interference (MAI) and require a very precise power control.…”

Section: Introductionmentioning

confidence: 99%

Frequency domain equalizer for multirate UMTS-TDD systems

Gonçalves

Gameiro

IEEE International Conference on Communications, 2003. ICC '03.

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Spread spectrum access methods for wireless communications

Cited by 271 publications

References 34 publications

Multi‐sensor frequency domain multiple access interference canceller for DS‐CDMA systems

Multi‐sensor frequency domain multiple access interference canceller for DS‐CDMA systems

Application of Asynchronous Channels Method to the W-CDMA Systems

Frequency domain equalizer for multirate UMTS-TDD systems

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