Transmitter power control is a necessity to combat "near-far" problems in radio systems using receivers with limited "dynamic range" (such as conventional DSCDMA systems). Transmitter power control, however, can also be used to control cochannel interference, i.e. interference from other users using the same channel (code or time slot). For this purpose, it has been shown that the optimum trans...

Commercial cellular networks, like the systems based on DS-CDMA, face many types of interferences such as multi-user interference inside each sector in a cell to interoperate interference. Independent Component Analysis (ICA) has been used as an advanced preprocessing tool for blind suppression of interfering signals in DS-CDMA communication systems. The role of ICA is to provide an interferenc...

This paper introduces a new Channel Estimation (CE) filter called Polyphase Lowpass-Interpolation (PLI)-filter for downlink coherent Rake-combining in a DSCDMA mobile environment. In this case some UTRA FDD scenarios are taken for showing the feasibility of this approach. It uses known periodically time-multiplexed pilot symbols for interpolating the channel coefficients in between. The idea of...

Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can increase the downlink bit error rate (BER) performance of DS-CDMA beyond that possible with conventional rake combining in a frequency-selective fading channel. FDE requires accurate channel estimation. Recently, we proposed a pilot-assisted channel estimation (CE) based on the MMSE criterion. Using ...

Two kinds of RAKE receiver combining schemes are investigated for a partial parallel interference cancellation (PPIC) technique, including maximal ratio combining (MRC) and minimum mean-squared error (MMSE) combining, in directsequence code-division multiple access (DS-CDMA) ultrawideband (UWB) systems. We use the normalized least meansquared algorithm to approach the MMSE solution for the RAKE...

Overlap frequency-domain equalization (FDE) requires no guard interval (GI) insertion while achieving the frequency diversity gain and hence can be applied to the present cellular systems using direct sequence-code division multiple access (DS-CDMA). It has been confirmed that assuming the ideal channel estimation, overlap FDE can provide almost the same bit error rate (BER) performance as the ...

Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can replace the conventional rake combining while offering significantly improved bit error rate (BER) performance for the downlink DS-CDMA in a frequency-selective fading channel. However, the presence of residual inter-chip-inference (ICI) after FDE produces orthogonality distortion among the spreading...

Karl-Dirk KAMMEYER and Dirk NIKOLAI Univ. of Bremen, Dept. of Telecommunications1 , P.O. Box 33 04 40, D-28334 Bremen, Germany Tel.: ++(49)-421/218-2453, Fax: ++(49)-421/218-3341, E-mail: [email protected] Abstract2: In this paper, we present a novel transmission scheme with application to Direct Sequence Code Division Multiple Access (DSCDMA) combining M -ary orthogonal and PSK modula...

A well-known receiver strategy for direct-sequence code-division multiple-access (DS-CDMA) transmission is iterative soft decision interference cancellation. For calculation of soft estimates used for cancellation, the distribution of residual interference is commonly assumed to be Gaussian. In this paper, we analyze matched filter-based iterative soft decision interference cancellation (MF ISD...