4G LTE

A parallel 3GPP R8 project to LTE and SAE is the Evolved High Speed Packet Access, eHSPA, project (also referred to as HSPA+). The proposed eHSPA features represent a logical evolution from today’s HSDPA and HSUPA systems. Roughly speaking, the eHSPA project focuses on three areas: • Optimising HSPA for real-time packet data services, like … Read more

A (rather long) list of general requirements has been set up as guidelines for the standardization work related to the EPC. Some of those are: • 3GPP and non-3GPP access systems shall be supported. • Scalable system architecture and solutions without compromising the system capacity (e.g. by separating CP from UP). • CP response time … Read more

Figure shows the network architecture of the Evolved Packet Core (EPC). The EPC consists of three main nodes: the Mobility Management Entity (MME), the Serving Gateway (SGW) and the Packet Data Network Gateway (PGW). The MME may be co-located with the SGW, and the SGW may be co-located with the PGW. Hence, the standard allows … Read more

The uppermost evolution track shown in Figure is that developed in the 3rd Generation Partnership Project (3GPP), which is currently the dominant standards development group for mobile radio systems and is described in more detail below. Within the 3GPP evolution track, three multiple access technologies are evident: the ‘Second Generation’ GSM/GPRS/EDGE family1 was based on … Read more

Affects of the Channel in LTE MIMO To understand the impact of the channel, let’s assume that the base station receiver is facing many challenges in the same MIMO receiver that universal areas, but also must receive data simultaneously from multiple users. In terms of MIMO UM, each signal is derived from a separate UE, … Read more

How Cross domain signal analysis in LTE Regarding cross domain analysis, we see that, I traditionally signal from a receiver RF section can be demodulated and Q components using analog techniques. Today, however, the down conversion signal is digitized by an ADC IF, and usually then fed into the section of the baseband demodulation and … Read more

Wide bandwidths concept for LTE MIMO One of the unique aspects of LTE is the support of the six channel bandwidths from 1.4 MHz to 20 MHz. To simplify system operation and roaming phones should support all these bandwidths, although effective deployment in any one area may be limited to fewer band width 20 MHz … Read more

Here I write short notes on how to test open loop and close loop testing in lte and what idea behind it. In open loop no any data send back and in closed loop all relevant data available to both side lets check in some detail. Open and close loop testing in LTE: Open loop … Read more

Receiver Design for LTE The main objective of the study is to take action for the entire measurement receiver. However, many factors can affect the performance of the receiver, such sub-blocks of receipt must be checked on the basis of the first and measurable contributions eliminate or reduce uncertainty. If using multiple receivers, it is … Read more

Basic Test for LTE Transmitter and Receiver Design LTE already requires fundamental changes in the base and handset and research project due to higher data rates, there is an important signal bandwidth and enhance integration and miniaturization in mobile phones, for example: Need to handle 6 different channel bandwidth from 1.4 to 20 MHz, and … Read more