The 3GPP Long Term Evolution (LTE) Release-8 specifications are designed to deliver higher peak data rates, higher throughput and lower air-interface latency compared to 2G and 3G systems. This higher performance will make it possible to support more demanding applications beyond web-browsing and voice, requiring higher data rates and stricter QoS constraints. Video services are becoming increasingly popular over the Internet indicating that the demand for such high data-rate video applications over cellular wireless will continue to grow. However, in order to make these services commercially viable in a LTE system it is necessary for the air-interface to deliver high quality services to a significant number of users simultaneously. In this paper we investigate the video capacity of a LTE air-interface using realistic video traffic models. An LTE air-interface can support multiple-antenna transmit arrays and several multiple antenna transmission modes to increase system capacity. We investigate the benefits of using 4 transmit antennas compared to 2 transmit antennas on the video capacity of an LTE system. The results from our investigation indicate that the capacity benefits with 4 transmit antennas are much higher with video services than those observed with other traffic models such as the full-buffer traffic model. The results also show that a 10MHz TDD LTE system can service upto 48 users per sector with 256Kbps video streams in the downlink indicating that such services can be commercially viable.
[Show abstract][Hide abstract] ABSTRACT: High data rate requirements of the Long Term Evolution - Advanced (LTE-A) systems can be achieved by
adopting advanced Multiple Input Multiple Output (MIMO) antenna techniques on both uplink and
downlink. The LTE air-interface supports multiple-antenna transmit arrays and different modes of multiple
antenna transmissions. In this paper, performance of different MIMO techniques is evaluated using
QualNet network simulator. The MIMO techniques considered for performance evaluation are SingleInput/ Multiple-Output (SIMO), Open Loop Spatial Multiplexing (OLSM) and Space-Frequency Block
Coding (SFBC). The performance metrics considered are throughput, delay and jitter.
[Show abstract][Hide abstract] ABSTRACT: Long Term Evolution (LTE) system adapts advanced Multiple Input Multiple Output (MIMO) antenna
techniques on both uplink and downlink to achieve high peak data rates and higher system throughput. This
enables LTE to support multimedia applications beyond web browsing and voice, which demands higher
bandwidth configurations. LTE employs Orthogonal Frequency Division Multiple Access (OFDMA) in downlink
to support spectrum flexibility in order to use upto 20MHz system bandwidth to improve the system throughput
and robustness. Therefore the combined study of multi-antenna techniques and spectrum flexibility usage on the
performance of LTE system becomes vital. Hence in this paper, an attempt has been made to evaluate the
performance of different multi-antenna techniques with various system bandwidth configurations from 1.4MHz
to 20MHz using QualNet 5.2 network simulator. The multi-antenna techniques considered for performance
evaluation are Single Input Single Output (SISO), Multiple Input Single Output (MISO) and Multiple Input
Multiple Output (MIMO). The performance metrics such as aggregate bytes received, average throughput,
average delay and average jitter are considered for simulation study.
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