Performance analysis of DS/CDMA with noncoherent M-ary orthogonal modulation in multipath fading channels

Jalloul, Louay M. A.; Holtzman, J.M.

doi:10.1109/49.298060

Cited by 140 publications

(65 citation statements)

References 31 publications

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“…2, where the square-law-based noncoherent -ary demodulation block is the same as that used in [8], and hence the interested readers are referred to [8] for further details. Multipath diversity combining invoking the EGC or the SC principle was implemented in the "EGC or SC" block.…”

Section: The Detection Modelmentioning

confidence: 99%

“…Then the received signal at the base station generated by the users can be expressed as (6) where (7) represents the AWGN, which is modeled as a random variable with zero mean and double-sided power spectral density of . After the receiver's bandpass filter, the noise becomes a narrow-band noise process, which can be expressed as [8] ( 8) where and represent low-pass-filtered Gaussian processes.…”

Section: B the Channel Modelmentioning

confidence: 99%

“…In order to randomize the effects of bursty symbol errors, the RS codewords are then interleaved. Finally, each RS coded symbol is -ary modulated, DS spread and carrier-modulated using the approach of [8], in order to form the transmitted signal. Hence, for convenience, we shall adopt notations similar to those used in [8].…”

Section: A the Transmitted Signalsmentioning

confidence: 99%

“…Finally, each RS coded symbol is -ary modulated, DS spread and carrier-modulated using the approach of [8], in order to form the transmitted signal. Hence, for convenience, we shall adopt notations similar to those used in [8]. In a DS-CDMA system in which there are active users transmitting their signals simultaneously, the signal transmitted by user , , can be expressed as [8] (1) where is the transmitted power, is the symbol duration, is the carrier's angular frequency, and is an offset time.…”

Section: A the Transmitted Signalsmentioning

confidence: 99%

“…In this paper, we investigate the performance of an RS coded DS-CDMA system, when -ary orthogonal signaling is employed in conjunction with an RTT-based erasure insertion scheme over multipath Rayleigh-fading channels. Two different diversity combining schemes [8], [21]-namely equal-gain combining (EGC) and selection combining (SC)-are considered, and their performance is evaluated in the context of the proposed RTT based erasure insertion scheme. We derive the probability density function (PDF) of the ratio defined in the RTT conditioned on both the correct detection hypothesis ( ) and erroneous detection hypothesis ( ) of the received -ary signals over multipath Rayleigh fading channels.…”

Section: Introductionmentioning

confidence: 99%

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A Reed-Solomon coded DS-CDMA system using noncoherent M-ary orthogonal modulation over multipath fading channels

Yang

Hanzo

2000

IEEE J. Select. Areas Commun.

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Abstract-The performance of Reed-Solomon (RS) coded direct-sequence code division multiple-access (DS-CDMA) systems using noncoherent -ary orthogonal modulation is investigated over multipath Rayleigh fading channels. Diversity reception techniques with equal gain combining (EGC) or selection combining (SC) are invoked and the related performance is evaluated for both uncoded and coded DS-CDMA systems. "Errors-and-erasures" decoding is considered, where the erasures are based on Viterbi's so-called ratio threshold test (RTT). The probability density functions (PDF) of the ratio associated with the RTT conditioned on both the correct detection and erroneous detection of the -ary signals are derived. These PDFs are then used for computing the codeword decoding error probability of the RS coded DS-CDMA system using "errors-and-erasures" decoding. Furthermore, the performance of the "errors-and-erasures" decoding technique employing the RTT is compared to that of "error-correction-only" decoding refraining from using side-information over multipath Rayleigh fading channels. As expected, the numerical results show that when using "errors-and-erasures" decoding, RS codes of a given code rate can achieve a higher coding gain than without erasure information.Index Terms-Direct sequence code division multiple-access, error-correction-only decoding, errors-and-erasures decoding, noncoherent -ary orthogonal signaling, ratio threshold test, Reed-Solomon codes.

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Section: The Detection Modelmentioning

confidence: 99%

Section: B the Channel Modelmentioning

confidence: 99%

Section: A the Transmitted Signalsmentioning

confidence: 99%

Section: A the Transmitted Signalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Reed-Solomon coded DS-CDMA system using noncoherent M-ary orthogonal modulation over multipath fading channels

Yang

Hanzo

2000

IEEE J. Select. Areas Commun.

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Variable-rate adaptive channel coding for CDMA-Reverse Link

Lau¹

2002

Bell Labs Tech. J.

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M‐sequence‐based M‐ary/SS/CDMA system using blocked viterbi decoding and accurate SNIR measurement techniques for high‐bit‐rate wireless communication systems

Ito¹,

Sampei²,

Morinaga³

2002

Electron. Comm. Jpn. Pt. I

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SUMMARYThis paper discusses the application of M-ary/SS (M-ary/Spread Spectrum) to DS/CDMA (Direct Sequence/Code Division Multiple Access) system. M-ary/SS system can realize a high-bit-rate transmission while maintaining a high processing gain. On the other hand, the system requires the same number of correlators as the number of candidate spreading codes. In this study, the orthogonal code based on M-sequence is used as the spreading sequence, in order to simplify the correlator configuration. In addition, an algorithm is proposed to realize the error-correcting code and the transmit power control, which are necessary in DS/CDMA system. As a result of analysis by computer simulation, it is shown that the proposed system has an excellent transmission performance.

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Performance analysis of DS/CDMA with noncoherent M-ary orthogonal modulation in multipath fading channels

Cited by 140 publications

References 31 publications

A Reed-Solomon coded DS-CDMA system using noncoherent M-ary orthogonal modulation over multipath fading channels

A Reed-Solomon coded DS-CDMA system using noncoherent M-ary orthogonal modulation over multipath fading channels

Variable-rate adaptive channel coding for CDMA-Reverse Link

M‐sequence‐based M‐ary/SS/CDMA system using blocked viterbi decoding and accurate SNIR measurement techniques for high‐bit‐rate wireless communication systems

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