Joint detection for multicarrier CDMA mobile radio systems. II. Detection techniques

Jung, Peter; Berens, F.; Plochinger, J.

doi:10.1109/isssta.1996.563454

Cited by 16 publications

(13 citation statements)

References 5 publications

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“…The Doppler spread of each user's channel is 20 Hz. Such a choice of the system parameters allows us to compare the obtained results with the ones presented in [4], where the same transmission technique, bandwidth, and environment are considered. However, the JD techniques examined in [4] are the conventional TD ZF and MMSE algorithms.…”

Section: B Simulation Resultsmentioning

confidence: 99%

“…If a CP of the required length is appended to every block, transmitted by each user, the received -element vector at the BS receiver equals (4) where is the vector of channel impulse response (CIR) samples associated with the th user's transmission, is the additive noise vector at the th signaling instant, and denotes cyclic convolution [17]. This convolution is carried out for each vector , and its result consists of samples.…”

Section: Inverse Ch-if Transform For Multiuser Detectionmentioning

confidence: 99%

“…One of the ways to overcome this problem is to use orthogonal spreading sequences, e.g., Walsh sequences [9]- [12], which provide orthogonality between the users' data signals and their separation at the receiver. The precision of power control and the accuracy of chip synchronization are also critical for the system tolerance to MAI [4], [5], [8], [9]. Another distortion typical for multipath fading radio channels is the intersymbol interference (ISI), which can be expected in a MC-CDMA system.…”

Section: Introductionmentioning

confidence: 99%

“…Another distortion typical for multipath fading radio channels is the intersymbol interference (ISI), which can be expected in a MC-CDMA system. Its impact depends on the symbol rate, system bandwidth, carrier spacing, and on the channel's delay spread [2], [4], [6], [13].…”

Section: Introductionmentioning

confidence: 99%

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Application of the Joint Discrete Hadamard-Inverse Fourier Transform in a MC-CDMA Wireless Communication System—Performance and Complexity Studies

Bogucka

2004

IEEE Trans. Wireless Commun.

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An efficient low-complexity algorithm proposed earlier by the same author is considered for the application in multicarrier radio communication systems with code-division multiple access. An inverse algorithm is proposed as a method of joint detection (JD), which is capable of rejecting intersymbol and multiple-access interference at a reasonable complexity. Computational complexity calculations as well as recent performance results of the proposed method are provided. The bit-error rate performance achieved by the simulated JD algorithms and equalizer structures is comparable with the performance of other methods which exhibit higher complexity.

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Section: B Simulation Resultsmentioning

confidence: 99%

Section: Inverse Ch-if Transform For Multiuser Detectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Application of the Joint Discrete Hadamard-Inverse Fourier Transform in a MC-CDMA Wireless Communication System—Performance and Complexity Studies

Bogucka

2004

IEEE Trans. Wireless Commun.

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“…10 [4], [5]. In this context the approach proposed in this paper as an alternative to the use of the Guard Time technique, is an adaptive receiver design able to cope with the corrupted signal.…”

Section: Introductionmentioning

confidence: 99%

A Fractionally Spaced Decision Feedback Joint Detection Proposal for Multi Carrier CDMA

Ikonomou

Vandendorpe

1999

Trans Emerging Tel Tech

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Abstract. Significant attention has been paid lately on Multiple Access (MA) schemes based on Code Division Multiple Access (CDMA) as well as Orthogonal Frequency Division Multiplexing (OFDM), especially in the context of the UMTS Terrestrial Radio Access (UTRA) selection process. The advantages and weaknesses of CDMA schemes are relatively well known as they provide high immunity against rnultipath, high flexibility and they are well suited for variable rate links. On the other hand, their performance and capacity is strongly dependent and limited by Multiple Access-and Self-Interference (MA1 and SI respectively). The advances in DSP technology resulting in compact and relatively easy to implement digital modulators combined with the favourable characteristics of OFDM such as immunity to Inter Symbol Interference (ISI), bandwidth efficiency and frequency diversity have resulted over the last years in a number of different radio access scheme proposals for mobile channels that combine OFDM and CDMA. In the context of this paper, we focus in the system implementation known as Multi Camer CDMA (MC-CDMA). The useof equalising receiver structures versus the use of the Guard Time technique in MC transmission schemes is discussedand a Fractionally Spaced Decision Feedback Equaliser (FSIDFE) receiver structure for an MC-CDMA system is proposed. Its performance is evaluated by means of computer simulations and compared to the use of the Guard Time technique. A FS Multiple Input Multiple Output (MIMO) DF equalising structure performing Joint Detection (JD) further improves the performance of the proposed equalising scheme in terms of MAI.

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A comparison of uplink channel estimation techniques for MC/JD-CDMA transmission systems

Steiner

Valentin²

1988 IEEE 5th International Symposium on Spread Spectrum Techniques and Applications - Proceedings. Spread Technology to Africa

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In the present contribution, the problem of MIMO (Multiple Input Multiple Output) uplink channel estimation in MC/JD-CDMA (Multi Carrier Joint Detection Code Division Multi-ple Access) systems is dealt with. ' b o different estimation approaches are proposed. The first approach is capable of directly estimating the desired samples of the so-called combined impulse response while the second approach relies on the well-known concept of estimating the samples on an unknown channel impulse response. In the course of the paper, the two approaches are discussed indicating both their advantages and drawbacks. Fmdly, simulation results are presented to facilitate a comparison of two approaches using a realistic channel model.

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Joint detection for multicarrier CDMA mobile radio systems. II. Detection techniques

Cited by 16 publications

References 5 publications

Application of the Joint Discrete Hadamard-Inverse Fourier Transform in a MC-CDMA Wireless Communication System—Performance and Complexity Studies

Application of the Joint Discrete Hadamard-Inverse Fourier Transform in a MC-CDMA Wireless Communication System—Performance and Complexity Studies

A Fractionally Spaced Decision Feedback Joint Detection Proposal for Multi Carrier CDMA

A comparison of uplink channel estimation techniques for MC/JD-CDMA transmission systems

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