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In Long Term Evolution (LTE) systems, some subcarriers at the borders of the allocated bandwidth are known as virtual subcarriers which are not used for data transmission. Conventional DFT-based channel estimation methods encounter performance degradation due to low SNR and the edge effect caused by virtual subcarriers. Adding virtual carrier frequency responses (VCFR) properly at receivers is proved...
Physical uplink control channel (PUCCH) in Long Term Evolution (LTE) consists of two basic transmission formats: format 1/la/lb and format 2/2a/2b. The semi-blind algorithm can improve channel estimation accuracy by using both data energy and RS energy for PUCCH format 2 in low-speed environment with a cost of higher computation complexity. This paper analyzes the semi-blind algorithm, and then we...
Device-to-Device (D2D) communication is the technology enabling user equipment (UE) to directly communicate with each other without help of evolved nodeB (eNB) which caters to the demand for high spectrum efficiency. This work focuses on the hybrid network which contains multiple Cellular UEs and D2D UEs. D2D communication shares up-link resource with cellular system and improves the performance of...
Device-to-Device (D2D) communication is an important complement for the future cellular network, which caters to the requirements of mobile internet applications. This article has studied the D2D communication underlaying the cellular networks, which allows the D2D user sharing uplink resource of cellular system. In order to limit mutual interference between cellular links and local D2D links, a semi-autonomous...
The development of LTE technology proposes new requirements on terminals, base stations and other key equipments. The physical layer of uplink and downlink chose the excellent Turbo code to reduce the error rate and improve system performance. In the course of the specific hardware implementation, Turbo encoding and decoding algorithms play a vital role to achieve the whole system. In this paper,...
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