Microprocessor

One of my interest at computer technology is microprocessor development. This is also my practicum subject at University of Indonesia. As an assistant at the Lab, I must improve my knowledge about microprocessor especially Intel, Zilog, and Motorola.

Basically every microprocessor has a sub-processor like ALU (Arithmetic Logic Units), control unit, registers, and this sub-processor become more and more as this technology always improves time by time. Registers is a part that the data will be proceed, this part also known as an internal memory of microprocessor. At Intel microprocessor there is 4 kind of this registers; one is general purpose registers, stack registers, flag registers, and index registers. All of this registers has it's own specific function.

General purpose registers is some registers for general use. This register usually has it's own function such as AX is a accumulator register, BX is a Base register (used as a base address of a memory), CX is a count register (used as a counter for loop processes), DX is a data register (used as a MSB for multiply and divide processes).

Flag registers is some registers to provide the status of environment that the program executes. this register is not for storing data that will be proceed, but this register contains the status of the CPU real time. Parity, overflow, carry, auxiliary carry, etc is some of this registers

Index registers used to store the address of string data that stored on the memory. SI (Source Index contain the source address of the string data) and DI (Destination Index contain the destination address of the string data) are two kinds of this register.

Stack registers used to store data with LIFO (Last In First Out) algorithm.

WiMAX as my research..

This is my research about WiMAX.. a technology standard issued by IEEE 802.16

WiMAX (Worldwide Interoperability Microwave Access) is a wireless networking system based on the IEEE 802.16 standards family. The version 802.16-2004, published in October 2004, supports various kinds of network topology. One of topology is called PMP (Point-To-Multipoint).

Within this topology every Mobile Station (MS) communicate directly via Base Station (BS). The second topology is denoted MESH. In this mode, two MSs communicate without employment of BS. The 802.16-2004 does not support handovers between cells. Consequently, 802.16-2004 allows only a fixed or nomadic access. Handover procedures are implemented in newest version of 802.16e,standardized in September of 2005. This version specifies handovers for portability and simple or full mobility of users.

WiMAX uses OFDM for it's modulation which is known as the best modulation method for a wireless access networking, but it's very complicated, so it is my problem to continue my research. I'm stuck here!

My point is to know about QoS of this WiMAX and try to simulate the system with software MATLAB 7.0.4 (simulink).