Resource Element Group in LTE In Long-Term Evolution (LTE), Resource Element Group (REG) is a fundamental concept related to physical layer resources. It is essentially a grouping of Resource Elements (REs), which are the smallest units of the time-frequency grid in LTE. The REG is used to allocate resources for transmission and reception. Now, let’s … Read more
Resource Block & Physical Resource Block in LTE What is Resource block in lte? :- A resource block is the smallest unit of resources which allocated to a user. The resource block is 1 slot long in time and 180 kHz wide in frequency. Resource Block Multiplex multiple users both in time and frequency, together … Read more
How LTE TDD Subframe Allocations? One of the advantages of using LTE TDD is that it is possible to dynamically change the up and downlink balance and characteristics to meet the load conditions. In order that this can be achieved in an ordered fashion, a total of seven up / downlink configurations have been set … Read more
How is Basic Frame Structure in LTE ? In FDD, the DL and UL Radio Frames (RFs) are not on the same carrier. The RF frame is called Type 1 by the 3GPP. The RF length is 10 ms. The radio frame is made up of 10 sub-frames of 1 ms. Each sub-frame is made … Read more
OFDMA Parameter for LTE How Many OFDMA Parameter for LTE? Which is OFDMA Parameter for LTE ? The width of a Sub-carrier is 15 kHz whatever the bandwidth The bandwidths are: 1.4, 3, 5, 10, 15 and 20 MHz Note that in LA1.1, only 5, 10 MHz are implemented The symbol duration is always the … Read more
Benefits of SC-FDMA Receiver in LTE Low Peak-to-Average Power Ratio (PAPR): SC-FDMA (Single-Carrier Frequency Division Multiple Access) exhibits a lower PAPR compared to other modulation schemes, reducing the demand for power amplifiers with high linearity. Improved Power Efficiency: Lower PAPR contributes to improved power efficiency, making SC-FDMA well-suited for mobile devices with limited battery capacity. … Read more
What is main Difference between DL and UL in LTE ? OFDMA Advantages Robust against narrow-band co-channel interference Robust against Intersymbol interference (ISI) and fading High spectral efficiency Efficient implementation using FFT Drawbacks High Peak-to-Average Power Ratio The power limitation is more problematic in UL than in DL Signal with high PAPR will limit the … Read more
How OFDMA Transmitter in LTE ? In the downlink, OFDM is selected to efficiently meet E-UTRA performance requirements. With OFDM, it is straightforward to exploit frequency selectivity of the multi-path channel with lowcomplexity receivers. This allows frequency selective in addition to frequency diverse scheduling and one cell reuse of available bandwidth. Furthermore, due to its frequency domain … Read more
Cyclic Prefix problem in LTE The cyclic prefix (CP) in LTE is a guard interval inserted in the time domain between successive symbols or OFDM (Orthogonal Frequency Division Multiplexing) symbols. Its purpose is to mitigate the effects of multipath fading and inter-symbol interference by providing a guard time that allows the signals to settle before … Read more
Inter-Symbol Interference in LTE Definition: ISI is a phenomenon in LTE where symbols transmitted over a communication channel overlap, causing distortion in the received signal. Causes: Multipath Propagation: Signals take multiple paths with different delays, leading to overlapping symbols. Time Dispersion: Variation in signal arrival times at the receiver contributes to ISI. Impact on LTE: … Read more