Here I write on article How Wimax works and on wimax terminology
QAM symbols are represented by the carrier signal being transmitted with specific phase (90°)/amplitude (dictated by the message), for finite periods of time. QAM constellations (patterns) 2 QAM (Binary PSK – BPSK) Two symbols are defined (1 amplitude; 2 phases) Every symbol transmitted over the transmission channel represents (carries) 1 message bit. Baud rate = … Read more
Data bits modulate (modify) a carrier signal Basic modulation techniques: amplitude frequency phase. Data bits are represented over the transmission channel by SYMBOLS Symbol rate is expressed in Baud (Symbols per Second) Modulation of a carrier is used to transmit data bits efficiently over the air interface The modulation process creates modulation symbols. A modulation … Read more
WiMAX Forum Definition of conformance and interoperability profiles out of the huge amount of options in IEEE 802.16 Interoperability testing and conformance & interoperability certification Definition of conformance and interoperability profiles is still focussing on OFDM 256 More than 380 companies 384 companies (status Nov. 05 / WiMAX Forum) Equipment/System Suppliers, Components Suppliers and Operators … Read more
Here I Write about WMAN Standardization Which is universally design and fixed for all Operator. Let’s Check in Detail. WMAN Standardization is inherited from 802.16 standard family CPE: Customer Premises Equipment AAS: Adaptive Antenna System OFDM: Orthogonal Frequency Division Multiplex QAM: Quadrature Amplitude Modulation BPSK: Binary Phase Shift Keying ETSI has defined two specifications, Hiper … Read more
Here i write about basic notes of How High Speed Data Solutions in wimax. These three diagrams compare various system parameters of WLAN (WIFI), WMAN (WiMAX) and the mobile network technologies UMTS with High speed Packed Downlink Access (HSPDA). The parameters have the following meaning: Spectral efficiency: is the exploitation of the radio frequencies Spectrum … Read more
This picture shows complementary access solutions for different mobility and nomadic, or “fixed mobile“ needs Today for all kinds of applications the appropriate access technology exists The figure shows the typical access solutions for different mobility and nomadic needs For fixed network access DSL-based systems deliver broadband data rates depending only on the type of … Read more
Salient Future for Mobile WiMAX WiMAX is a wireless broadband solution that offers a rich set of features with a lot of flexibility in terms of deployment options and potential service offerings. Some of the more salient features that deserve highlighting are as follows: OFDM-based physical layer: The WiMAX physical layer (PHY) is based on … Read more
Orthogonal frequency division multiple access (OFDMA): Mobile WiMAX uses OFDM as a multiple-access technique, whereby different users can be allocated different subsets of the OFDM tones. As discussed in detail in Chapter 6, OFDMA facilitates the exploitation of frequency diversity and multiuser diversity to significantly improve the system capacity. Flexible and dynamic per user resource … Read more
The challenge to broadband wireless comes from the scarcity of radio-spectrum resources. Regulatory bodies around the world have allocated only a limited amount of spectrum for commercial use. The need to accommodate an ever-increasing number of users and offering bandwidth-rich applications using a limited spectrum challenges the system designer to continuously search for solutions that … Read more
Applications using a fixed wireless solution can be classified as point-to-point or point-to-multipoint. Point-to-point applications include interbuilding connectivity within a campus and microwave backhaul. Point-to-multipoint applications include broadband for residential, small office/home office (SOHO), and small- to medium-enterprise (SME) markets, T1 or fractional T1-like services to businesses, and (3) wireless backhaul for Wi-Fi hotspots. Consumer … Read more