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The most important third generation (3G) cellular communications standard is based on wideband CDMA (WCDMA). Receivers based on TDMA style channel equalization at the chip level have been proposed for a WCDMA downlink employing long spreading sequences to ensure adequate performance even with a high number of active users. These receivers equalize the(More)
The use of lattice reduction (LR) has been shown to be a very effective method for signal detection in multiple antenna systems. In this letter, the performance of the suboptimal soft-output maximum a posteriori (MAP) detector with lattice reduction is studied. We propose two polynomial-time methods for flat fading channels to generate the desired size(More)
Inter-operator spectrum sharing in a wide-area broadband network is considered in this paper. A packet-based cellular model is developed, emphasizing the shift in the telecommunications industry towards IP-based services. In the framework of this architecture, we show the ideal maximum load that the network can handle without excessive delays, and present(More)
Conventional versions of linear multiuser detectors (MUD) are not feasible in the wideband code division multiple access (WCDMA) downlink due to the use of long scrambling sequences. As an alternative, linear channel equalizers restore the orthogonality of the spreading sequences lost in frequency-selective channels, thus, suppressing multiple access(More)
The main air-interface in the 3rd generation cellular communications is wideband CDMA (WCDMA). For WCDMA downlink, multiple access interference (MAI) suppression by symbol-level equalization has proven to be problematic due to long spreading sequences employed in downlink. To circumvent the problem, receivers based on channel equalization at chip level have(More)
Multiple transmit and receive antennas with spatial multiplexing are planned for wideband code division multiple access (WCDMA) systems. Thus, multiple–access interference (MAI) and inter–antenna interference (IAI) have to be mitigated. In this paper, a new linear receiver applicable for downlink employing long scrambling code is presented and compared to(More)
Receivers based on channel equalization have proven to be one of the most promising candidates for terminal receivers in wideband code-division multiple-access (WCDMA) downlink. The channel equalizers provide multiple access interference (MAI) suppression, and thus ensure adequate receiver performance even with a high number of active users. However, the(More)
This paper presents the concept of spectrum sharing in connection to beyond 3rd generation (B3G) systems. Inter-system spectrum sharing mechanisms are summarised and classified depending on their coordination capabilities and the relative priorities between the systems involved in the sharing. Novel radio resource management (RRM) functionalities for(More)