This article presents an overview of the LTE physical layer with a focus on essential aspects of the physical layer for FDD mode, which is the. Type 1 signals and LTE TDD Type 2 signals described in the standard documents This overview is not an exhaustive description of the physical layer, but is.
LTE Physical Layer Overview
This technical white paper provides an overview of the LTE physical layer (PHY), including technologies that are new to cellular such as Orthogonal Frequency.
The values shown on the layer traces do not have a direct physical correspondence to the subcarrier that they are mapped to. Spatial multiplexing can be used to send data to UE's that have more than one receive antenna. Type 1 uses Frequency Division Duplexing uplink and downlink separated by frequencyand 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.
Channel data undergoes several other steps before being mapped onto the OFDM subcarriers. Once a physical channel's codewords have been scrambled and modulated, the codewords are mapped onto the layers.
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|This, in conjunction with a pseudorandom scrambler run over the transmitted data bits, ensures that the likelihood of two spatial streams correlating is very low.
Users are allocated rectangular areas of resource blocks and expect to find their data in those locations. For the single-antenna case, precoding is just a direct assignment of the layer contents to the antenna port data for the current physical channel. The base station broadcasts some basic cell information, including where random-access requests can be transmitted.
lte physical layer overview
It provides an overview of frequency. lte physical layer overview. 1.
Video: Overview of the lte physical layer 2.7 - MAC SCHEDULER & PHYSICAL CHANNELS IN 4G LTE
LTE Physical-Layer Overview Peter Wang January, 16, ; 2. OUTLINE • LTE requirements & features.
In this example, there are four C-RS antenna ports and three layers. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads.
Video: Overview of the lte physical layer LTE Physical Resources Block - SixtySec
The following is an illustration of a TDD frame with uplink-downlink configuration set to 2 and special subframe configuration set to 6. How can these traces show layer data in the context of resource elements and symbols? The value M in the M-point FFT in the illustration above is the width in subcarriers of the uplink allocation assigned to the user.
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|Instead of precoding, beamforming can be used. Codeword-to-layer mapping splits the data into layers. The frequency domain representation of the signal enables easy precoding to match the signal to the frequency and phase characteristics of the multi-path radio channel.
There are six time units: frame, half-frame, subframe, slot, symbol, and the basic time unit T sas shown in the following table.
In FDD mode, uplink and downlink frames are both 10ms long and are separated either in frequency or in time. Subframe 6 can also be configured to be a special subframe. There is only one control channel transmitted by uplink users—the Primary Uplink Control Channel PUCCH —which contains information including channel quality info, acknowledgements, and scheduling requests.