L. Chu and U. Mitra, "Analysis of MUSIC-based delay estimators for DS-CDMA systems," IEEE Trans. Commun., vol. 47,  Home/Search Document Details and Download
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Multiuser Receivers that are Robust to Delay Mismatch - Zha, Blostein (Correct)
....In this section, we simulate the performance of our proposed robust SIC multiuser detector, and compare its performance to that of the decorrelating detector with and without perfect time delay estimates. Throughout the simulations, if it is not otherwise stated, we will assume as in [11] [29] that the delay estimation errors are independent zero mean Gaussian random variables with equal standard deviation # # = 0.1T c for all users, and d k (i) is used rather than d k dec (i) in (24) and (25) Gold code sequences of length N = 31 and a block size of M = 9 are used. Unless ....
L. Chu and U. Mitra, "Analysis of MUSIC-based delay estimators for DS-CDMA systems," IEEE Trans. Commun., vol. 47,
Multiuser Receiver Structures dor CDMA - Zha (2002) (Correct)
....case, there will be residual MAI. If this residual MAI is not eliminated, the performance will degrade. For MUSIC based delay estimation, it is shown in [110] that the probability of p k 6= p k is very small for SNR 1 = 15 dB and M = 100 observation lengths at nearfar ratio of 20 dB. So in [15], this case is not included in performance evaluation of the MUSIC based delay estimator. However, it is interesting to know how large the probability that p k 6= p k will be, if we assume the delay error is Gaussian distributed and can across chip boundaries, and a uniformly distributed actual ....
L. Chu and U. Mitra, "Analysis of MUSIC-based delay estimators for DS-CDMA systems," IEEE Trans. Commun., vol. 47, no. 1, pp. 133--138, Jan. 1999. 125
Maximum-Likelihood Based Multipath Channel Estimation.. - Ertin, Mitra.. (1998) (8 citations) Self-citation (Mitra) (Correct)
....case) by minimizing the norm of the projection. Simultaneously, a similar single path blind subspace estimation technique was introduced in [11] Both of these works estimate time delays as continuous valued unknowns. Further asymptotic analysis of the time delay estimators of [11] is provided in [12, 13]. In the current work, it is shown that there are scenarios in which the algorithms of [10] produce a large number of outliers due to an implicit assumption about timing information. In [14] synchronous DS CDMA) and [15] asynchronous DS CDMA) subspace techniques are employed to estimate fading ....
L.-C. Chu and U. Mitra, "Analysis of MUSIC-based delay estimators for DS-CDMA systems." to appear in IEEE Trans. Commun., 1999.
Approximate Maximum Likelihood Sequence Detection for DS/CDMA.. - Chu, Mitra (1999) (2 citations) Self-citation (Chu Mitra) (Correct)
....or global positioning system (GPS) channels. A detailed discussion of delay estimation is beyond the scope of this paper. Instead, statistics of the residual errors in delay estimation, as well as amplitude estimation, are assumed. Our model for the timing error is based on a previous analysis [19] of the modified MUSIC delay estimator [20, 21] for multiuser channels. Similar model was also assumed for estimation errors in fading coefficients in [3] The assumption of knowledge of error statistics facilitates an approximate Bayesian solution for the detection block, which is less ....
.... average uncertainty principle subject to fixed variance for # [23] We have shown that the estimation errors made by a MUSIC type estimator in AWGN channels are indeed asymptotically Gaussian [24] The modified MUSIC estimator has been recently proposed as a potential multiuser delay estimator [19, 20]. For bandwidth limited signals, Nyquist sampling provides sufficient statistics for data detection regardless of the time of arrival. By the same token, Nyquist sampling takes no advantage of timing information when it is available. If the timing is perfectly known, symbol rate sampling is ....
L.-C. Chu and U. Mitra, "Analysis of MUSIC-based delay estimators for DS-CDMA systems," IEEE Trans. on Communications, vol. 47, pp. 133--138, January 1999.
Performance Analysis of an Improved MMSE Multi-user Receiver.. - Chu, Mitra (1998) (5 citations) Self-citation (Chu Mitra) (Correct)
....(e.g. 16] the observations that are employed for delay estimation are not 1370 IEEE TRANSACTIONS ON COMMUNICATIONS, 46(10) PP.1369 1380, OCTOBER 1998 independent in asynchronous DS CDMA systems. We have explored the behavior of MUSIC timing estimates for DSCDMA multi user systems [17], which are asymptotically Gaussian as proved by Stoica and Nehorai [18] One can view the Gaussian distribution as a representative of the family of unimodal distributions. The assumption of zeromean Gaussian delay errors was also adopted in [6] 7] As a comparison, the uniform distribution is ....
L.-C. Chu and U. Mitra, "Analysis of MUSIC-based delay estimators for DS-CDMA systems," to appear in IEEE Trans. on Communications. 1380 IEEE TRANSACTIONS ON COMMUNICATIONS, 46(10), PP.1369-1380, OCTOBER 1998
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