Jakes fading model revisited

Dent, P.; Bottomley, G.E.; Croft, Thomas

doi:10.1049/el:19930777

Cited by 513 publications

(216 citation statements)

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“…Moreover, an additional 22 cyclic prefix symbols are used as a guard interval after each data block. The data transmission is implemented simply over MIMO frequency selective channels with slow time variant fading, generated by the typical Jakes fading model [5] and 3-delay taps have been introduced into each sub-channel, i.e. a frequency-selective sub-channel tap length L 3 and /=I = 1, where I is the variance of the /th path.…”

Section: Simulation Resultsmentioning

confidence: 99%

A Joint Coded Two-Step Multiuser Detection Scheme for MIMO OFDM System

Zhang

Sellathurai

Chambers

2007

2007 IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP '07

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Section: Simulation Resultsmentioning

confidence: 99%

A Joint Coded Two-Step Multiuser Detection Scheme for MIMO OFDM System

Zhang

Sellathurai

Chambers

2007

2007 IEEE International Conference on Acoustics, Speech and Signal Processing - ICASSP '07

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“…Therefore the uplink and downlink transmission can be interleaved in bursts of T ¼ 666.7 ms. As in Section 4.1, we consider N ¼ 8, L ¼ 5 and n 2 k,i ¼ 1=L. The fading process of each channel path is formed by samples of a stationary zero-mean complex Gaussian process with autocorrelation function J 0 (2pf d t) [28] and is generated according to the method described in [29]. We consider the performance of the TH-chip-original precoding technique with loading and ordering.…”

Section: Th-precoding With Channel Predictionmentioning

confidence: 99%

Multiuser TH-precoding for TDD–CDMA over multipath channels

2007

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Nonlinear precoding schemes for downlink time-division duplex -CDMA systems over multipath fading channels, are considered. First, the capacity results of a downlink CDMA system with either multiuser detection or precoding, were obtained and compared. It is seen that the two schemes exhibit similar capacity regions for both sum rate and maximum equal rate, which motivates the development of efficient nonlinear transmitter precoding techniques to reduce the receiver complexity at the mobile units without degrading the system performance. We then develop both bit-wise and chip-wise Tomlinson -Harashima (TH) multiuser precoding methods for downlink CDMA with multipath, to remove multi-user interference, inter-chip interference and inter-symbol interference. Efficient algorithms for multiuser power loading and ordering are also developed. Implementation of the proposed TH-precoding schemes in time-varying channels based on channel prediction is addressed as well. Simulations results are provided to demonstrate the effectiveness of the proposed techniques in suppressing interference in downlink CDMA. IntroductionMultiuser detection (MUD) techniques are considered powerful for interference suppression in CDMA systems, especially in uplinks, where the base-station receiver has the knowledge of all users' spreading sequences and channel states, and can perform sophisticated signal processing [1]. In the downlinks, however, the mobile receiver typically has only the knowledge of its own spreading sequence and channel state. Although adaptive linear MUD (either training-based or blind) can be employed for such scenario, the performance can be limited because of the linear constraint on the detector. Moreover, the power constraint of the mobile calls for simple receiver processing. On the other hand, the precoding schemes for downlink CDMA effiectively transfer the signal processing for interference suppression from the mobile receiver to the base-station transmitter. This approach is feasible if the base-station can estimate the downlink channels of all users [e.g. in systems employing time-division duplexing (TDD) where the uplink and downlink channels are reciprocal]. In [2], a precoding method was proposed which is essentially an implementation of the RAKE receiver at the transmitter. Hence this approach does not attempt to mitigate the multiple-access interference (MAI). Recently, different linear precoding techniques have been proposed to combat MAI and inter-chip interference but without considering inter-symbol interference (ISI) [3,4]. If the ISI is present then the complexity of these techniques becomes prohibitive since the dimension of the matrix filter is proportional to the data frame length multiplied by the number of users (i.e. block processing). More recently, bit-wise linear precoding methods have been proposed to reduce the precoding complexity in the presence ISI [5]. The downlink CDMA is a special case of broadcast channels. There has been significant recent interest in characterising the ca...

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“…Jakes' model has been extensively used for simulating time-varying Rayleigh fading with U-shaped Doppler power spectrum [5], [6]. The model can be simply applied to MIMO channels.…”

Section: Introductionmentioning

confidence: 99%

Arrangement of Scattering Points in Jakes' Model for i.i.d. Time-Varying MIMO Fading

Nishimoto¹,

Nishimura²,

Ohgane³

et al. 2007

IEICE Transactions on Communications

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Hiroshi NISHIMOTO †a) , Student Member, Toshihiko NISHIMURA †b) , Takeo OHGANE †c) , and Yasutaka OGAWA †d) , Members SUMMARY For simulating i.i.d. time-varying MIMO channels using multiple Jakes' rings, it is desirable to generate channels having stable statistics with fewer scatterers. The statistical property of the conventional Jakes' model may depend on the initial phase set assigned to scattering points. In this letter, we present simple and effective conditions on arrangement of scattering points to achieve stable fading properties. The results show that the proposed arrangement provides higher statistical stability in generating time-varying channels.

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Jakes fading model revisited

Cited by 513 publications

References 1 publication

A Joint Coded Two-Step Multiuser Detection Scheme for MIMO OFDM System

A Joint Coded Two-Step Multiuser Detection Scheme for MIMO OFDM System

Multiuser TH-precoding for TDD–CDMA over multipath channels

Arrangement of Scattering Points in Jakes' Model for i.i.d. Time-Varying MIMO Fading

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