Pre-RAKE diversity combination for direct sequence spread spectrum communications systems

Esmailzadeh, Riaz; Nakagawa, Masao

doi:10.1109/icc.1993.397307

Cited by 45 publications

(47 citation statements)

References 4 publications

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“…In general, for a system with prefiltering, with prefiltering impulse response ( ), (11) generalizes to the following (see, e.g., [18]):…”

Section: Reference Modelmentioning

confidence: 99%

“…With reference to model of Section 2, and in particular to (11) and impulsiveness index i, the received signal at UT is…”

Section: Channel Estimation and Data Transmissionmentioning

confidence: 99%

“…Pioneering work on single-antenna TR spread-spectrum communications dates back to the nineties, where the TR prefilter was named pre-Rake [10,11]. The basic idea was to prefilter the transmitted pulse with the channel impulse response reversed in time, therefore matching the transmitted signal with the subsequent channel.…”

Section: Introductionmentioning

confidence: 99%

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Robustness of Time Reversal versus All‐Rake Transceivers in Multiple Access Channels

Nardis

Fiorina

Ferrante

et al. 2018

Wireless Communications and Mobile Computing

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Time reversal (TR) is an effective solution in both single user and multiuser communications for moving complexity from the receiver to the transmitter, in comparison to traditional postfiltering based on Rake receivers. Imperfect channel estimation may, however, affect pre-versus postfiltering schemes in a different way; this paper analyzes the robustness of time reversal versus AllRake (AR) transceivers, in multiple access communications, with respect to channel estimation errors. Two performance indicators are adopted in the analysis: symbol error probability and spectral efficiency. Analytic expressions for both indicators are derived and used as the basis for simulation-based performance evaluation. Results show that while TR leads to slight performance advantage over AR when channel estimation is accurate, its performance is severely degraded by large channel estimation errors, indicating a clear advantage for AR receivers in this case, in particular when extremely short impulsive waveforms are adopted. Results however also show a stronger non-Gaussianity of interference in the TR case suggesting that the adoption of a receiver structure adapted to non-Gaussian interference might tilt the balance towards TR.

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“…In general, for a system with prefiltering, with prefiltering impulse response ( ), (11) generalizes to the following (see, e.g., [18]):…”

Section: Reference Modelmentioning

confidence: 99%

“…With reference to model of Section 2, and in particular to (11) and impulsiveness index i, the received signal at UT is…”

Section: Channel Estimation and Data Transmissionmentioning

confidence: 99%

See 1 more Smart Citation

Robustness of Time Reversal versus All‐Rake Transceivers in Multiple Access Channels

Nardis

Fiorina

Ferrante

et al. 2018

Wireless Communications and Mobile Computing

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“…In this paper, we consider the downlink transmission. So far, some pre-equalization techniques have been proposed [14][15][16]. It was shown [16] that, with the perfect CSI, pre-FDE can provide almost the same BER performance as FDE reception.…”

Section: Introductionmentioning

confidence: 99%

BER Performance of Joint THP/pre-FDE

Takeda

Tomeba

Adachi

2008

VTC Spring 2008 - IEEE Vehicular Technology Conference

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Abstract-Recently, frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion has been attracting much attention to overcome the frequency-selective fading channel. The bit error rate (BER) performance of singlecarrier (SC) transmission is significantly improved by using MMSE-FDE by obtaining the frequency-diversity gain while suppressing the inter-symbol interference (ISI). However, the residual ISI after MMSE-FDE limits the performance improvement. Recently, we have proposed a joint use of Tomlinson-Harashima precoding (THP) and FDE reception (joint THP/FDE) to suppress the residual ISI. However, joint THP/FDE requires the channel state information (CSI) at both the transmitter and receiver. In this paper, we replace FDE reception by pre-FDE and propose joint THP/pre-FDE that requires the CSI at the transmitter only, while providing almost the same BER performance as joint THP/FDE.

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“…Even though ISI and MAI exist over a transmission channel, direct-sequence code-division multiple access (DS-CDMA) can suppress them by means of the processing gain (or by the process of despreading in the time domain at the receiver) and can improve the signal-to-interference-andnoise ratio (SINR). In addition, the DS-CDMA can further improve the SINR by applying a combining method such as RAKE and Pre-RAKE [1], [4], [5]. However, the suppression capability for ISI and MAI declines in DS-CDMA when the processing gain is not sufficiently large to achieve high-speed data communications within a given bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Asynchronous, Decentralized DS-CDMA Using Feedback-Controlled Spreading Sequences for Time-Dispersive Channels

Miyatake

Chiba

Hamamura

et al. 2008

IEICE Transactions on Communications

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SUMMARYWe propose a novel asynchronous direct-sequence codedivision multiple access (DS-CDMA) using feedback-controlled spreading sequences (FCSSs) (FCSS/DS-CDMA). At the receiver of FCSS/DS-CDMA, the code-orthogonalizing filter (COF) produces a spreading sequence, and the receiver returns the spreading sequence to the transmitter. Then the transmitter uses the spreading sequence as its updated version. The performance of FCSS/DS-CDMA is evaluated over time-dispersive channels. The results indicate that FCSS/DS-CDMA greatly suppresses both the intersymbol interference (ISI) and multiple access interference (MAI) over time-invariant channels. FCSS/DS-CDMA is applicable to the decentralized multiple access.

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Pre-RAKE diversity combination for direct sequence spread spectrum communications systems

Cited by 45 publications

References 4 publications

Robustness of Time Reversal versus All‐Rake Transceivers in Multiple Access Channels

Robustness of Time Reversal versus All‐Rake Transceivers in Multiple Access Channels

BER Performance of Joint THP/pre-FDE

Asynchronous, Decentralized DS-CDMA Using Feedback-Controlled Spreading Sequences for Time-Dispersive Channels

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