Wimax
Spatial multiplexing and Receive Diversity in Wimax Spatial multiplexing WiMAX also supports spatial multiplexing, where multiple independent streams are transmitted across multiple antennas. If the receiver also has multiple antennas, the streams can be separated out using space-time processing. Instead of increasing diversity, multiple antennas in this case are used to increase the data rate … Read more
Advanced Antenna Systems,Transmit diversity and Beamforming in Wimax Advanced Antenna Systems The WiMAX standard provides extensive support for implementing advanced multiantenna solutions to improve system performance. Significant gains in overall system capacity and spectral efficiency can be achieved by deploying the optional advanced antenna systems (AAS) defined in WiMAX. AAS includes support for a variety … Read more
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
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
LTE Layer 2 user plane protocol stack in detail LTE user Layer 2 Protocol stack-the plan is composed of three substrates, as shown in the figure. Packet layer packet data convergence Protocol (PDCP) : this layer processes messages resource control (RRC) in the control plan and packages of Internet Protocol (IP) addresses in the user’s … 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
Angular Spread and Coherence Distance calculation for Wimax Calculation Angular Spread and Coherence Distance is very easy let’s see. So far, we have focused on how the channel response varies over time and how to quantify its delay and correlation properties. However, channels also vary over space. We do not attempt to rigorously treat all … Read more