![]() For instance, a 5 MHz Megahertz: A unit of frequency equal to one million hertz or cycles per second. The 89600 VSA LTE demodulator currently only supports resource blocks that are 12 subcarriers wide.įrequency units can be expressed in number of subcarriers or resource blocks. In frequency, resource blocks are either 12 x 15 kHz subcarriers or 24 x 7.5 kHz subcarriers wide The number of subcarriers used per resource block for most channels and signals is 12 subcarriers. wide in frequency and 1 slot long in time. The resource block is 180 kHz kiloHertz: A radio frequency measurement (one kilohertz = one thousand cycles per second). (0.5 ms) / 7 for normal CP 1) Contention period, orīelow is an illustration of an FDD frame.Ī resource block ( RB Resource Block) is the smallest unit of resources that can be allocated to a user. There are six time units: frame, half-frame, subframe, slot, symbol, and the basic time unit (T s), as shown in the following table. Terminologyįirst, an introduction to some of the terms used in describing an LTE Frame. Keysight has also released a book called LTE and the Evolution to 4G Wireless: Design and Measurement Challenges which contains detailed information on many of the aspects of LTE. For information specific to LTE-Advanced, see Introducing LTE-Advanced, App Note 5990-6706EN. ![]() This overview is not an exhaustive description of the physical layer, but is intended to provide you with a useful background when you configure the 89600 VSA LTE-Advanced demodulator to make measurements.įor a more in depth explanation of LTE, see the 3GPP Long Term Evolution: System Overview, Product Development, and Test Challenges, Application Note 5989-8139EN. Type 1 signals and LTE-Advanced TDD Type 2 signals described in the standard documents listed in the About Opts BHG and BHH: LTE-Advanced Modulation Analysis topic. This overview covers both LTE-Advanced FDD Frequency Division Duplex: A duplex scheme in which uplink and downlink transmissions use different frequencies but are typically simultaneous. uses Time Division Duplexing (uplink and downlink separated in time). Type 1 uses Frequency Division Duplexing (uplink and downlink separated by frequency), and TDD Time Division Duplex: A duplexing technique dividing a radio channel in time to allow downlink operation during part of the frame period and uplink operation in the remainder of the frame period. There are two types of frame structure in the LTE Long Term Evolution standard, Type 1 and Type 2. LTE-Advanced Physical Layer Overview LTE-Advanced Physical Layer Overview
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