Ferry P. Wathan

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—Novel low-density signature (LDS) structure is proposed for transmission and detection of symbol-synchronous communication over memoryless Gaussian channel. Given as the processing gain, under this new arrangement, users' symbols are spread over chips but virtually only chips that contain nonzero-values. The spread symbol is then so uniquely interleaved as(More)
The capacity of CDMA-based systems, for instance UMTS, is interference limited. The downlink (DL) is expected to carry much more traffic than in the uplink (UL) for multimedia applications services. If the characteristic of the DL channel is a priori known at the base station (BS), preprocessing data before transmission at BS reduces interference at mobile(More)
— Novel Low-Density Signature (LDS) structure is proposed for synchronous Code Division Multiple Access (CDMA) systems for an uplink communication over AWGN channel. It arranges the system such that the interference pattern being seen by each user at each received sampled chip is different. Furthermore, new near-optimum chip-level iterative multiuser(More)
— The brute-force MAP-based Chip-Level Iterated (CLi) Multiuser Detection techniques exploiting the newly proposed Low-Density Signature (LDS) structure have been shown to approach the performance of Single-User even at overloading condition of up to 200%. However, their complexity is exponential to the number of interfering users in a chip that can be(More)
A batch Kalman-based blind adaptive multiuser detection (K-BA-MUD) with multiple receiver (Rx) antennas is investigated for asynchronous CDMA systems in the Uplink direction. In this paper, we consider two receiver structures: the Independent and the Cooperative structure. Previous results had stated that the Cooperative structure always outperforms the(More)
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