EUTRAN Uplink Performance

Abstract

Alongside with on-going further WCDMA development, work on Evolved Universal Terrestrial Radio Access Network (EUTRAN), also known as Long Term Evolution (LTE), has been initiated in 3GPP. The objective of EUTRAN is to develop a framework for the evolution of the 3GPP radio-access technology towards wider bandwidth, lower latency and packet-optimized radio-access technology with peak data rate capability up to 100 Mbps. For the uplink direction, Single Carrier -FDMA (SC-FDMA) has been chosen as the multiple access technology. This paper introduces the uplink technology, the current state of progress in 3GPP as well as expected schedule for actual specification availability and describes a couple of key features, channel dependent frequency domain scheduling and Multi-User MIMO in more detail. System performance results for channel dependent frequency domain scheduling are presented as well.

Trellis-Based Receivers for SC-FDMA Transmission over MIMO ISI Channels

“…The system model in principle is valid for a single-user MIMO transmission with N T = 2 transmitted data streams as well as a (synchronous) multi-user transmission of N T = 2 users equipped with a single antenna each. Both scenarios are relevant for LTE [3]. Simulation results will be given only for the single-user case, where the two transmitted data streams are jointly encoded.…”

“…Subsequent to the DFT, subcarrier assignment is made according to the LTE standard [1], for which the localized mode and the distributed mode [3] have been proposed. We focus on the former because it is considered as more relevant for LTE currently.…”

“…e.g. [3], [5], which will serve also as a preprocessing stage for the trellis-based equalization scheme presented in Section IV. In this section, we revisit MMSE linear equalization for MIMO SC-FDMA transmission.…”

“…A major advantage of SC-FDMA compared to standard OFDM, which is employed in the downlink of LTE, is its reduced peak-to-average power ratio (PAPR) enabling a low-complexity implementation of the mobile terminal and improved performance especially at the cell edge [2], [3]. SC-FDMA will be used in conjunction with multiple-input multiple-output (MIMO) transmission, which plays an important role in LTE in order to improve coverage and capacity [4].…”

“…SC-FDMA will be used in conjunction with multiple-input multiple-output (MIMO) transmission, which plays an important role in LTE in order to improve coverage and capacity [4]. In the receiver at the base station, frequencydomain minimum mean-squared error (MMSE) linear equalization [3], [5] or block-iterative decision-feedback equalization (BI-DFE) [6]- [8] might be applied. In [8], it has been shown that the uncoded bit error rate (BER) of BI-DFE can approach the matched filter bound for increasing signal-tonoise ratio (SNR).…”