Channel estimation using time multiplexed pilot symbols for coherent RAKE combining for DS-CDMA mobile radio

Andoh, Hidehiro; Sawahashi, Mamoru; Adachi, Fumiyuki

doi:10.1109/pimrc.1997.627027

Cited by 75 publications

(54 citation statements)

References 9 publications

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“…MS averaging has been proposed for slow-fading channels [2]. For fast fading channels the slowly varying features of the propagation channel can still be exploited by explicitly estimating angles and delays with high resolution (and computationally expensive) methods [3].…”

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confidence: 99%

Multislot estimation of fast-varying space-time channels in TD-CDMA systems

2002

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Abstract-In this letter we propose a subspace method to estimate the time-varying space-time channel by taking into account the different rates of variation between delays/directions of arrival (slowly-varying) and faded amplitudes (fast-varying) of the multipath propagation. The stationarity of angles and delays across several time-slots is exploited to perform an unstructured estimation that avoids the explicit computation of the path parameters. Numerical analysis for a TD-CDMA system shows that the asymptotic performance is reached with a reasonable number of slots.

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confidence: 99%

Multislot estimation of fast-varying space-time channels in TD-CDMA systems

2002

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“…SF=32 is assumed. Pilot symbol based channel estimation is carried out using the weighted multi-slot averaging (WMSA) method [6] with N p =4 symbols (i.e., 4 x SF pilot chips) and N d =32 symbols (i.e., 32 x SF data chips). The channel is assumed to be a frequency non-selective slow Rayleigh fading channel with f D T=0.001, which corresponds to a maximum Doppler frequency f D of 128Hz for an information data rate of 64k bits/s and a chip rate of 4.096M chips/s.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…Gaussian variables, therefore, γ is χ-square distributed with 2(SFxM) degrees of freedom. Hence, assuming ideal channel estimation, the γ-pdf can be obtained as follows [5]: (6) which is equivalent to (SFxM)-branch MRC diversity reception with uncorrelated fading. Thus, the deep fades in the channel can be effectively avoided.…”

Section: I=nsf~(n+1)sf-1}mentioning

confidence: 99%

Chip interleaved turbo codes for DS-CDMA in a Rayleigh fading channel with diversity reception

Garg

Adachi

Proceedings IEEE 56th Vehicular Technology Conference

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Abstract-A new channel interleaving method, called chip interleaving, for direct sequence code division multiple access (DS-CDMA) mobile radio is proposed. Chip interleaver scrambles the chips and transforms the transmission channel into a highly time-selective or highly memoryless channel. It was found that the turbo decoding performance which degrades in a fading channel is significantly improved with chip interleaving. It was also found that the bit error rate (BER) performance improves with increasing spreading factor (SF) and increasing frame length. Chip interleaving is effective in the presence of antenna diversity as well, however the improvement decreases with the increase in the number of antennas.

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“…The delay profile of multipaths is assumed to be invariant within one slot 1 . To simplify the model, we assume that all users are chiprate synchronized, that is, the delays between paths are multiples of chip interval …”

Section: Fig 1 System Modelmentioning

confidence: 99%

“…Several channel tracking methods are proposed based on time multiplexed pilot symbols and interpolation techniques e.g. [1] [8]. These methods utilize only pilot symbols over multiple slots, which requires pilot symbols with high SNR and long observation time.…”

Section: Introductionmentioning

confidence: 99%

Blind channel tracking for long-code WCDMA with linear interpolation model

Sung

Tong

Conference Record of the Thirty-Sixth Asilomar Conference on Signals, Systems and Computers, 2002.

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A new technique for tracking of fast fading channels in long code CDMA is proposed. Using a linear interpolation model, the proposed method tracks the time-varying channel without pilot symbols or with sparsely inserted pilots. The proposed method can be implemented efficiently using a statespace inversion technique. A new identifiability condition is established and the performance of the method is assessed through the mean square error and bit error rate.

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Channel estimation using time multiplexed pilot symbols for coherent RAKE combining for DS-CDMA mobile radio

Cited by 75 publications

References 9 publications

Multislot estimation of fast-varying space-time channels in TD-CDMA systems

Multislot estimation of fast-varying space-time channels in TD-CDMA systems

Chip interleaved turbo codes for DS-CDMA in a Rayleigh fading channel with diversity reception

Blind channel tracking for long-code WCDMA with linear interpolation model

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