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Publications (3)0 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: We derive and analyze an advanced decentralized (single-user) linear receiver for wideband code-division multiple-access (W-CDMA) systems operating in frequency-selective fading channels. We focus particularly on the forward link whose performance needs improvement for third-generation (3G) mobile radio systems and beyond. By considering the forward link specific characteristics a near optimum decentralized linear receiver, here called an “MMSE combiner”, is proposed, which optimally (based on MMSE criterion) combines the advantages of both a matched filter RAKE receiver (used to compensate for multipath fading) and an inverse filter linear equalizer (acts to suppress MAI). That is, the proposed receiver consists of the matched filter (RAKE receiver) and inverse filter in parallel, followed by a linear (MMSE-based) combiner. The resulting receiver structure is relatively simple, as are other sub-optimal single-user receivers, and does not require any knowledge of other active users' CDMA codes. The receiver treats both multiple-access interference (MAI) and intersymbol interference (ISI) as noise. Monte-Carlo simulation results are given showing that the performance of the proposed MMSE combiner nearly approaches that of the optimum decentralized linear receiver
    Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st; 02/2000
  • Sung-Hyuk Shin, P.J. Voltz
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    ABSTRACT: We study a novel single-user receiver for the forward link of a B-CDMA<sup>TM</sup> system in multipath fading environments. For a typical forward link all B-CDMA<sup>TM</sup> signals transmitted from a base-station arrive at a given mobile receiver through identical multipath fading channels. This renders the conventional matched filter RAKE receiver decidedly sub-optimum. The proposed receiver consists of a bank of digital correlators (BDC) followed by a linear combiner. It treats multiple access interference (MAI) as additional background noise, while taking into account in an optimal way the homogeneous characteristics of the MAI. Numerical results are provided showing that the proposed receiver leads to significant system performance enhancement relative to the matched filter RAKE receiver and zero-forcing (ZF) channel equalizer (inverse filter receiver)
    Vehicular Technology Conference, 1998. VTC 98. 48th IEEE; 06/1998
  • Sung-Hyuk Shin, P.J. Voltz
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    ABSTRACT: The proposed receiver treats the MAI as additional noise, while exploiting in an optimal way the homogeneous characteristics of the MAI which is partially suppressed at the despreader of the receiver by utilizing orthogonal sequences. The matched filter RAKE receiver and inverse filter are also considered for comparison. The system performance is evaluated in terms of required bit-energy to effective noise (MAI-plus-AWGN) power spectral density to achieve an acceptable quality of service. We show that employing the concatenated orthogonal/random spreading scheme in the synchronous forward link, the proposed receiver results in better system performance relative to the others and show the impact of the concatenated spreading sequences on the forward link system performance, as compared to the use of the nonconcatenated random spreading scheme
    Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on; 01/1998