International Journal of Engineering Research ISSN:2319-6890)(online),2347-5013(print) Volume No.3, Issue No.11, pp : 688-691 01 Nov. 2014 IJER@2014 Page 688 LTE Physical Layer DL Simulator & PSS Detection Algorithm Evaluation Using the LTE DL Simulator PVND Prasad, Dr.K.PadmaRaju, S. PoornimaPoojitha Deputy Head Delivery (Asst General Manager), L&T Technology Services, Bangalore,India Principal, University College of Engineering, JNTUK, Kakinada, India Department of Electronics and Communication Engineering, University College of Engineering, JNTUK, Kakinada, India sppoojitha@gmail.com Abstract:TheLTE PHY simulator will be able to implement all the processes of physical layer in less time and more accuracy.The simulator presented here can be done for any bandwidth, channel models and modulation schemes. This paper presents synchronizing algorithm withdownsampledsynchronizing signals and shows the results on several channels. Keywords: Low cost, low power, matched filter, primary synchronization signal (PSS). I. Introduction: The explosive growth of cell phone users and the increasing demand for broadband wireless access has led to the development of long term evolution (LTE) to replace the wideband code division multiple access (WCDMA)-based air interface by the 3rd Generation Partnership Project (3GPP). Several minimum requirements of LTE include packet datasupport with peak data rates of 300 Mbps in the downlink and 75 Mbps in the uplink. Carrier aggregation, MIMO (Multi Input and Multi output), CoMP (Coordinated multipoint Transmission and reception), Self-Organizing Network (SON) are the salient features of LTE. The physical layer deals with bit-level transmission between different devices connecting to the physical medium for synchronized communication. Synchronization sequence is more important because its detection affects not only search time but also performance of demodulation. The 3GPP working group undertakes plenty of rigorous evaluation of different kinds of sequence to enhance the performance of search time. Consequently, it was decided to adopt Zadoff-Chu (ZC) sequences as the downlink primary synchronization signal (PSS) and the uplink random access preamble. The ZC sequences are a group of general-chirp-like sequences with good correlation properties. Currently used matched filters are computation- intensive since they require a large number of constant complex multiplications.In LTE system, in order to access the network, User Equipment(UE) should detect the primary synchronization signal (PSS) and secondary synchronization signal (SSS) in downlink (DL) signal from the surrounding base stations (BS).In FDD, PSS is mapped to the last OFDM symbol in slots 0 and 10. The PSS is mapped to the third OFDM symbol in sub frames 1 and 6 in TDD. PSS is ZC(zadoff Chu) sequence which is 62 complex symbols. For NID=0,1,2 u= 25,29,34. When these codes are used as a synchronization code, the correlation between the ideal sequence and a received sequence is greatest when the lag is zero. The ZC sequence is chosen for its good periodic autocorrelation and cross-correlation properties.In particular, these sequences have a low frequency offset sensitivity. Thus, it is easy to detect PSS during the initial synchronization because the ZC sequence has the flat frequency domain autocorrelation property and the low frequency offset sensitivity. II. LTE DL PHY Simulator And PSS Detection Evaluation Using Simulator: LTE Downlink Physical Layer simulator, which comprises of Transmitter, Channel model and Receiver Sections has been developed. The simulator supports export and import configuration to reproduce the configuration of interest quickly.A PSS detection algorithm has been tested using the LTE DL simulator. LTE Simulator enabled simulation of the algorithm in a close to real-world scenario with various channel models.