A low complexity physical-layer identity detection for 3GPP Long Term Evolution

Long Term Evolution (LTE) is one of radio access technology that has been intensively studied in 3GPP standard group to support instantaneous downlink and uplink peak data rates of 100 Mb/s and 50 Mb/s within 20 MHz downlink and uplink spectrum allocations, respectively. Employing OFDMA and scalable bandwidth scheme in downlink access impact on increasing cell search complexity. In this paper we propose low complexity physical layer identity detection as one of cell search step using finite impulse response (FIR) and partial cross-correlation. Our propose scheme is done in time domain instead of frequency to avoid FFT involvement and decrease processing latency. As a result, the proposed scheme just needs 20169 LUTs when implemented in FPGA Virtex-4 XC4VLX200 and can perform physical layer identity detection for SNR 0 dB or higher in AWGN channel by probability more than 95%.