Patent ID: 9717100
Date: 2017-07-25
CPC Classifications: H04L,H04W

Claim:
1. A method for generating Physical Random Access Channel (PRACH) reference segments in a Long Term Evolution (LTE) communication system, the method comprising: generating, by a preamble sequence generation unit, a plurality of preamble sequences using a Constant Amplitude Zero Auto Correlation (CAZAC) sequence, wherein each preamble sequence has length of a valid CAZAC sequence; transforming, by a first Discrete Fourier Transform (DFT) unit, the plurality of preamble sequences into a plurality of frequency domain signals by performing a DFT on the plurality of preamble sequences; generating, by a subcarrier mapping unit, a plurality of subcarrier mapped signals by performing subcarrier mapping of the plurality of frequency domain signals, wherein the subcarrier mapping is performed based on a subcarrier spacing associated with a Physical Random Access Channel (PRACH) in a Long Term Evolution (LTE) communication system; transforming, by an Inverse DFT (IDFT) unit, the plurality of subcarrier mapped signals into a plurality of time domain signals by performing an IDFT, wherein the plurality of time domain signals are sampled at a sampling rate suitable to a receiver system and a suitable IDFT length is selected based on the sampling rate, in order to perform transformations; generating, by a CP-insertion unit, a plurality of standard PRACH preamble signals by adding a Cyclic Prefix (CP) to each time domain signal of the plurality of time domain signals, wherein the CP is a copy of an end-segment of the time domain signal; segmenting, by a segmenting unit, each standard PRACH preamble signal from the plurality of standard PRACH preamble signals to generate a plurality of segments of uniform size, wherein the segments are either contiguous or non-contiguous, wherein the non-contiguous segments are separated by a time gap accommodated in between each segment of the non-contiguous segments; generating, by a second DFT unit, a plurality of frequency domain segments by performing a half-subcarrier shift and a DFT on the plurality of segments, wherein the frequency domain segments comprise sub-carriers spaced in accordance with a Single Carrier Frequency Division Multiple Access (SC-FDMA) signal; and generating, by a first subcarrier de-mapping unit, a plurality of PRACH reference segments by selecting frequency locations from the plurality of frequency domain segments, wherein the frequency locations correspond to PRACH frequency locations.