Blind multi-user detection using CMA in a multicarrier CDMA receiver

Sanchez, D. Tapia; Meana, Hector Manuel Perez; Miyatake, Mariko Nakano

doi:10.1109/iceee.2004.1433846

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…In [5],the author proposes a multi-user detection for MC-CDMA systems based on stochastic gradient descent constant modulus algorithm (SGD-CMA), SGD methods are quite sensitive to the selected step size. A small step size will lead to slow convergence rate, whereas a large step size will result in the adapted weight oscillation.…”

Section: Imentioning

confidence: 99%

PIC Receiver for MIMO MC-CDMA Systems Based on LCRLSCMA

Zhao

2008

2008 4th International Conference on Wireless Communications, Networking and Mobile Computing

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Parallel interference canceller (PIC) is a powerful algorithm to combat multi-user interference (MUI). In this paper, a PIC receiver for space-time block coded multiple input multiple output multi-carrier code division multiple access (STBC MIMO MC-CDMA) based on linearly constraint recursive least squares constant modulus algorithm (LCRLSCMA) is studied. Simulations indicate that the proposed algorithm has better BER performance than the traditional algorithms among different environments.Keywords-Space-time block coded multiple input multiple output multi-carrier code division multiple access; linearly constraint recursive least squares constant modulus algorithm; Parallel interference canceller; multi-user detection. I.I NTRODUCTION Space-time block coded (STBC) multiple input multiple output (MIMO) systems can increase the channel capacity and spectral efficiency without adding extra bandwidth and power consumption. Multi-carrier code-division multiple access (MC-CDMA) , which combines the advantages of orthogonal frequency division multiplexing (OFDM) with code division multiple access (CDMA), has the high frequency efficiency and interference suppression ability.In STBC MC-CDMA systems, the minimum mean square error (MMSE) receiver has low spectral efficiency for training sequences; MMSE receiver based on subspace[1, 2], which requires the estimation of the signal and noise subspace, has high complexity; In[3, 4], a robust Multi-user Detection based on the variable diagonal loading of the sample covariance is raised, which has high complexity for matrix inverse and subspace estimation.The CMA algorithm is widen used in multi-user detection for its robustness and efficiency. In [5],the author proposes a multi-user detection for MC-CDMA systems based on stochastic gradient descent constant modulus algorithm (SGD-CMA), SGD methods are quite sensitive to the selected step size. A small step size will lead to slow convergence rate, whereas a large step size will result in the adapted weight oscillation. In [6],the author proposes a joint subspace MMSE and CMA multi-user detection algorithm, which requires twice subspaces decomposition, has error spread when the imperfect estimation of the first subspace and will lead to the performance descent; Recursive least-squares CMA has rapid convergence rate, in multi-user (multi-mode) environment, CMA has local minimum, the algorithm[7] may converge to interfere user. In this paper linearly constraint recursive least squares (LCRLSCMA) combining with PIC structure is raised, which can eliminate MAI and suppress noise, by using generalized sidelobe cancellation structure, we transform the constraint cost function into a non-constraint issue, and iterative formula of the LCRLSCMA is derived. Finally, parallel interference cancellation technology after the LCRLSCMA is implemented for desired user's detection, and multi-user interference is further eliminated. Simulations indicate that the proposed algorithm has better performance than that of the traditional algorithms amon...

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Section: Imentioning

confidence: 99%

PIC Receiver for MIMO MC-CDMA Systems Based on LCRLSCMA

Zhao

2008

2008 4th International Conference on Wireless Communications, Networking and Mobile Computing

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“…Many multiuser detection approaches have been proposed in literature [3][4][5]. Recently, blind adaptive multiuser detection has received special attention and several detectors have been proposed [5][6][7][8][9][10][11][12][13][14]. The main motivation for employing a blind detector is to avoid the requirements of a training sequence, which is commonly required in most of the 978-1-4244-6588-0/10/$25.00 ©201 0 IEEE adaptive multiuser detectors proposed previously.…”

Section: Introductionmentioning

confidence: 99%

“…The main motivation for employing a blind detector is to avoid the requirements of a training sequence, which is commonly required in most of the 978-1-4244-6588-0/10/$25.00 ©201 0 IEEE adaptive multiuser detectors proposed previously. For the analogy between inter-symbol interference (lSI) and MAl, some blind adaptive multiuser detection [5][6][7][8][9][10][11][12][13][14] has been receiving a great deal of research recently, and it requires no additional knowledge than conventional single user receiver, that is, the desired user's signature waveform and its timing. In wireless communications system, the conventional CMA [4] for blind multiuser detection has some disadvantages such as slow convergence speed and phase rotation.…”

Section: Introductionmentioning

confidence: 99%

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Invasive weed optimization method based blind multiuser detection for MC-CDMA interference suppression over multipath fading channel

Hung

Chao

Cheng

et al. 2010

2010 IEEE International Conference on Systems, Man and Cybernetics

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The paper presents a novel constrained constant modulus (CMA) approach for the blind suppression of multiuser interference in multi-carrier code division multiple access (MC-CDMA) systems. In this paper, we put forward a novel receiver, which combines CMA blind adaptive multiuser detection with Invasive weed optimization (IWO) for MC-CDMA interference suppression over multipath fading channel. To work around potentially computational intractability, the proposed scheme exploits heuristics in consideration of both global and local exploration the step size of the CMA. The computer simulation results show that compared with the various CMA developed previously, the proposed IWO method obtains the most desirable bit error rate performance with low computational complexity.

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A modified linearly constrained Constant Modulus Algorithm to suppress multiuser interference

Gao

Zhou

2008

2008 11th IEEE Singapore International Conference on Communication Systems

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Blind multi-user detection using CMA in a multicarrier CDMA receiver

Cited by 3 publications

References 8 publications

PIC Receiver for MIMO MC-CDMA Systems Based on LCRLSCMA

PIC Receiver for MIMO MC-CDMA Systems Based on LCRLSCMA

Invasive weed optimization method based blind multiuser detection for MC-CDMA interference suppression over multipath fading channel

A modified linearly constrained Constant Modulus Algorithm to suppress multiuser interference

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