Turbo receivers for interleave-division multiple-access systems

Cristea, Bogdan; Roviras, Daniel; Escrig, Benoît

doi:10.1109/tcomm.2009.07.070525

Cited by 22 publications

(9 citation statements)

References 35 publications

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“…We note that some part of the equivalence shown above for IDMA systems have been discussed in the literature for BPSK in [29], [38], [39] whereas our proof is more general for complex modulation alphabets = { 1 , . .…”

Section: (For Idma Under Assumption Iii2)mentioning

confidence: 77%

“…We analyze the system using EXIT chart [21], [24], [38], [48], which is a convenient tool for studying iterative processing techniques. The EXIT chart shows the average mutual information between the transmitted code bits and the input LLRs, which are obtained from the other soft-in soft-out block, versus the average mutual information between the transmitted code bits and the extrinsic output LLRs, which are sent to the other block.…”

Section: Analysis Using Extrinsic Information Transfer Chartsmentioning

confidence: 99%

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IDMA vs. CDMA: Analysis and Comparison of Two Multiple Access Schemes

Kusume

Bauch

Utschick

2012

IEEE Trans. Wireless Commun.

123

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This article presents comprehensive comparisons of interleave division multiple access (IDMA) and direct sequence code division multiple access (DS-CDMA) in terms of performance and complexity assuming iterative multiuser detection. IDMA can be seen as a special case of DS-CDMA with spreading gain of one using very low rate code and user-specific interleavers for user separation. We focus on three suboptimum linear detectors: minimum mean square error (MMSE), rake (or matched filter), and soft-rake detectors from practical concerns. We analytically prove that the three detectors are equivalent for asynchronous users of IDMA on frequency flat channels for complex modulation alphabets. Such equivalence has been shown only for binary phase shift keying (BPSK) in the literature. The equivalence guarantees the MMSE solution for IDMA without computationally expensive matrix inversions or matrix-vector multiplications. This is generally not the case for DS-CDMA since DS-CDMA is sensitive to user asynchronism. We also discuss complexity aspects when the MMSE detector is used where we focus on essential differences in complexity between IDMA and DS-CDMA, instead of discussing particular complexity reduction techniques. Computer simulations are performed in various scenarios and the performance is analyzed by bit error rate simulations as well as by extrinsic information transfer (EXIT) charts. The analysis reveals the advantages of IDMA over DS-CDMA in terms of performance and complexity under practical considerations, particularly in highly user loaded scenarios.Index Terms-Interleave division multiple access (IDMA), direct sequence code division multiple access (DS-CDMA), multiuser detection, iterative detection and decoding.

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Section: (For Idma Under Assumption Iii2)mentioning

confidence: 77%

Section: Analysis Using Extrinsic Information Transfer Chartsmentioning

confidence: 99%

IDMA vs. CDMA: Analysis and Comparison of Two Multiple Access Schemes

Kusume

Bauch

Utschick

2012

IEEE Trans. Wireless Commun.

123

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“…The proposed technique in [3] is in contrast to the code-division multiple access (CDMA), where users are separated through user-specific spreading sequences [4]. In comparison with CDMA, the IDMA has significant advantages such as less complex detection scheme without compromising the diversity gain [5,[6][7][8][9]. Further the IDMA outperforms the CDMA when it is integrated with iterative turbo decoding schemes at the receiver terminal [4,5,8].…”

Section: Introductionmentioning

confidence: 99%

“…In comparison with CDMA, the IDMA has significant advantages such as less complex detection scheme without compromising the diversity gain [5,[6][7][8][9]. Further the IDMA outperforms the CDMA when it is integrated with iterative turbo decoding schemes at the receiver terminal [4,5,8]. The other important significance of the IDMA is the easy integration with MIMO systems [10].…”

Section: Introductionmentioning

confidence: 99%

Security Improvement in Next GenerationWireless System by Interleaverin Transceiver Structures

Partibane¹,

Kalidoss²,

Karthipan³

2018

JCSM

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This paper presents the multiple-input multiple-output Interleave division multiple access (MIMO-IDMA) system with dual polarized division multiplexing (DPDM). Dual polarized antenna system replaces the uni-polarized antenna system availing cost and space features. We have considered dual-Polarized antennas at both the transmitter and the receiver ends to establish DPDM. For the purpose of accommodation, the users are separated with userspecific interleaver in combination with a low rate spreading sequence. In the receiver, we consider the minimum mean square error (MMSE) algorithm based successive interference cancellation (SIC) Multiuser detection (MUD) technique to diminish the effects of multi-stream interference (MSI). Furthermore, we implement Log-maximum a posteriori probability (MAPP) decoding algorithm at the mobile stations (MSs) to alleviate the effects of multiuser interference (MUI). We evaluate the effects of coded MIMO-IDMA system in the context of downlink (DL) communication pertaining to the Stanford University Interim (SUI) and Long-term Evolution (LTE) channel

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“…This includes the usage of low complex multiuser detectors than required for CDMA systems [5]- [12]. Further studies in [4] [5] [13]- [18] have proven that IDMA systems can outperform CDMA when iterative (turbo) receivers are used. Therefore recent developments have shown that IDMAs can be easily integrated into the MIMO systems [15].…”

Section: Introductionmentioning

confidence: 99%

Triple-Polarized Multi-User Mimo-Idma System under Correlated Fading Channel

Partibane¹,

Nagarajan²

2016

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A multiple-input multiple-output interleave division multiple access (MIMO-IDMA) system with Triple Polarized Division Multiplexing (TPDM) is presented in this paper. The present methodology replaces three independent linearly polarized antennas with a single triple polarized antenna at both the transmitter and receiver. The users in the communication link are accommodated and separated using a user-specific interleaver combined with low rate spreading sequence. To eliminate the effects of multi-stream interference (MSI), minimum mean square error (MMSE) algorithm based on successive interference cancellation (SIC) Multi-user detection (MUD) technique is employed at the receiver. Furthermore, log-maximum a posteriori probability (MAPP) decoding algorithm is implemented at the mobile stations (MSs) to overcome the effects of multi-user interference (MUI) effects. The paper also evaluates the effects of coded MIMO-IDMA in the downlink communication by adopting the Stanford University Interim (SUI) and Long-term Evolution (LTE) channel model specifications. In comparison with the traditional uncoded system, the present solution considering turbo coded triple-polarized MIMO-IDMA system with iterative decoding algorithm provides better bit error rate (BER) with reduced signal to noise ratio (SNR). The simulation results also show that though the SNR requirement is higher for the proposed technique compared to the conventional uni-polarized antenna based MIMO-IDMA system, it gives the advantages of achieving higher data rate with reduced cost and space requirements in the context of a downlink (DL). Keywords

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Turbo receivers for interleave-division multiple-access systems

Cited by 22 publications

References 35 publications

IDMA vs. CDMA: Analysis and Comparison of Two Multiple Access Schemes

IDMA vs. CDMA: Analysis and Comparison of Two Multiple Access Schemes

Security Improvement in Next GenerationWireless System by Interleaverin Transceiver Structures

Triple-Polarized Multi-User Mimo-Idma System under Correlated Fading Channel

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