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Fullchipdesign.com - Topics covered in Verilog RTL, Digital Design, Digital Basics, Radio Frequency and Python Scripting.  

OFDM Principle for Wireless:-

Its a modulation scheme which transmits data over a large number of channels known as subcarriers.  The most important property of OFDM is the orthogonal relationships of the sub-carriers.

Orthogonality in details :-
Signals are Orthogonal if they don’t interfere with each other.  This interference can be avoided by controlling the transmission of the signals one of the several domains. Some of the most prominent domains are frequency, time and space.   

In LTE, its done by synchronizing UE local frequency oscillator with the eNodeB and hence insuring Orthogonality between in-different sub-carriers. This results in theoretical zero inter-symbol-interference.  This is very important requirement of OFDM systems.

OFDMA - Orthogonal Frequency Division Multiple Access & SC-FDMA - Singe Carrier Frequency Division Multiple Access

SC-FDMA - Single Carrier Frequency Division Multiple Access

SC-FDMA is still a multiple access scheme like OFMDA but avoids multiple carriers in transmission. With only one carrier at transmitter the signal has comparatively low peak-to-average power ratio (PAPR).



Peak-to-Average Power Ratio (PAPR) -
Its a ratio of the peak amplitude of the waveform divided by the Root Mean Square Value (RMS) of the waveform.

With low PAPR the mobile terminal can increase transmit power efficiency.

Evolved Packet Core (EPC) system architecture for all IP.Mobility Management Entity (MME),
Serving System (S) Architecture (A) Evolution (E) Gateway or Serving Gateway SGW.
Packet Data Network (PDN) SAE Gateway
Enhanced Packet Data Gateway (ePDG)
Multiple antenna techniques -
MIMO, Adaptive antenna systems - AAS and
Antenna diversity - AD

LTE topics @ FCD

What is LTE? Key driving factors behind 4G technology.
LTE Data rates and comparison with 3G rates.
Difference between air, radio and core network..  
Seamless mobility in 4G.

Media Gallery

Las Vegas
Grand Canyon
Alcatraz -the rock
San Francisco
Napa Valley
Los Angeles
17 Mile Drive
Golden Gate Bridge
Blog- Planning California Trip

Hardware components of a smart-phone.
CPU or processor of a cell phone.
Operating System or simply O/S
RAM, a type of memory and SD Memory
Applications for direct user interface.
PIXELS for resolution of screen.

Resources

Verilog RTL code examples for front-end chip design.

Digital Design Topics
Half-adder, full-adder,
Adder-sub tractor
Stack Organization - LIFO, RPN
Parity Generation and error checking
Binary multiplier circuit.
CMOS introduction
Digital fundamentals -
RTL coding guidelines. ICG cell, Assertions, $assertkill, levels. Chandle
Pipeline vs. Parallel processing.