At Entiv, we have the knowledge and tools needed to more effectively analyze, specify, and solve a multitude of common wireless data modem design problems.
Entiv help you design and implement better performing wireless and wireline data modems for telepohony, mobile and satellite communications. At Entiv we utilize TAS (Telecom Analysis Systems) products to aid in the development, manufacture, and evaluation of sophisticated electronic communications equipment. We use TAS test equipment to test wireless voice and data communications transceivers. PSTN data and fax modems, ISDN and DSL transmission equipment, and much more. We have several years of experience utilizing TAS Series II Plus Telephone Network Emulator, TAS 100 Series, TAS GT Series Modem Test Systems, TAS Gemini Warp Dual Terminal Emulator, TAS 240A Voiceband Subscriber Loop Emulator, TAS 2200A Loop Emulator, and TAS 2270 Digital Subscriber Loop Emulator.
Based on the Entiv's several years of experience in wireless product design, "Practical Wireless Data Modem Design"...
Entiv provides analysis methods for phase lock loops, phase noise, spurious emissions intermodulations, electromagnetic interference and more.
Entiv presents design details of satellite ground station modems and the interaction between link budgets and modem performance specifications and implementations.
At Entiv we explore digital cellular telephone modem performance issues, various modulation types and modem applications, explain modem design "Rules of Thumb", and supply the design details of a functional (63,47) Reed Solomon Codec used in CDPD. With extensive experience with complex digital communications concepts and full coverage of FCC legal requirements.
Entiv’s Wireless Modem Application Overview: Over-the-Air Medium and Link Budgets, Transceiver Pass band Design, Frequency Source and Synthesizer Implementations, Modem Design Analyses and Implementations, Forward Error Correction Code, Radio Regulatory Requirements, Listing of Ku-Band Geostationary Satellites, Listing of C-Band Geostationary Satellites, Listing of US Cities and Rain Zones, MathCAD ™ Data Files, and Mathematical Formulas. At Entiv we emulate wireline telecommunication network and validate your wireline modem design.
Key design, and implementation topics as follow:
Introduction
Summary of Common Modulation Techniques
A Wireless Modem Application Overview
Cellular Telephones
Wide Area Wireless Data Services
Wireless Local Loop
Large-Scale Systems
Small-Scale Systems
Mixed Distribution Systems
Satellite Communications
Fixed Digital Microwave Links
Wireless LAN
LMDS and Other Applications
Landline Telephone Modems
Over-the-Air Medium and Link Budgets
Antenna Fundamentals
Isotropic Source
Antenna Gain
Directivity
Eirp
Antenna Parameters by Inspection
Radiation Pattern
Propagation Channels
Gaussian Channel
Rayleigh Fading Channel
Path Loss Calculations
Fresnel Zone
Rain Margins and the Crane Rain Model
Satellite Link Budget
Wet Antenna Effects
The Wet Antenna Feed-Horn Radome
The Wet Reflector Antenna Surface Case
Dielectric Behavior of Water
Signal Loss Results
Water Sheet Thickness
Man-Made Interference
Microwave Oven Measurement Setup
Microwave Oven Interference Measurement Results
Microwave Oven Interference Model
Transceiver Pass band Design
Frequency Plan
Intermodulation Product Analysis
Second-Order Intermodulation
Third-Order Intermodulation
Spurious Free Dynamic Range
Thermal Noise and Noise Figure
Transceiver Gain Chain Margin
Eye Diagram
ð/4 `Shifted QPSK Signal Simulation
Transmit Spectrum Regrowth
Phase Distortion and Group Delay
Battery Requirements
Frequency Source and Synthesizer
Implementations
Phase-Lock Loops
Classifications of Phase-Lock Loops
Type I Second-Order
Type II Second-Order
Type II Third-Order
Type II Fourth-Order
Type III Third-Order
Linear Analysis of Phase-Lock Loop
Reference Spurious Emission Leak-Through
Frequency-Lock Loop
Phase Noise Analysis
Assessment of Phase Noise
Phase Noise Variance
Phase Noise Variance Computation
Ber Performance Degradation Analysis
VSAT Reference Frequency Source
VSAT Reference Extraction
Actual Performance Assessment
Spurious Tone Interference
Spur Level Analysis
Direct Digital Synthesis
Phase Quantization
Amplitude Quantization
Sine Wave Representation
Modem Design Analyses and Implementations
Reversed-Time Matched Filter Design
ZOZO and Other Tests
USDBS-1 Transponder Channel Test Filter
A Low-Cost BPSK Demodulator Design for LEO
Design Backgrounds
Demodulator Design Approach
Integrate and Dump Filter
Differential Coding
A High-Performance Analog 20 Msps QPSK
Demodulator ASIC Design
Analog Demodulator Integrated Circuit Design
Design of a High-Performance Digital VSAT
Modem Design
VSAT Application Background
Key Performance Specifications
A VSAT Modem Design Implementation
Signal Soft Decision, Carrier Recovery,
and AGC Loops Implementation
Bit Recovery Loop Implementation
Transmit Burst Control
Processor Functions
Closing Remarks on VSAT Modem Design
Implementation of Differential Detection
Demodulation
Differential Detection with Imperfect Time Delay
A GMSK Modem Used in CDPD Application
Background
GMSK Modulator
Modulator Implementation
Limiter Discriminator Demodulator
Forward Error Correction Codec
Genesis of Forward Error Correction Codes
Basic Selection of Coding Schemes
CDPD Reed Solomon Channel Coding
Galois Field GF(26) Arithmetics
CDPD Reed Solomon Encoder
A CDPD Reed Solomon Decoder
CDPD Scrambler
Prony's Method
Harmonic Solution Using Prony's Method
Introduction to Radio Regulatory Requirements
FCC Part 15 Regulation Requirements
FCC Part 15, Section 15.107
FCC Part 15, Section 15.107 Measurement Setup
FCC Part 15, Section 15.109
FCC Part 15, Section 15.109A
FCC Part 15, Section 15.109B
FCC Part 15, Subpart C
FCC Part 15, Section 15.205
FCC Part 15, Section 15.209
FCC Part 15, Section 15.207
Field Strength and Transmitted Power Relationship
Electromagnetic Compatibility
ANSI/IEEE Standard C95.1-1992
Notice of Proposed Rule Making Submission
An NPRM Submission Example
FCC Rule-Making Order
NII SUPERNet Report and Order Cover Sheet
FCC Order Extracts Related to MSS Feeder Link
FCC Order Extracts Related to
Interference Potentials
Listing of Ku-Band Geostationary Satellites
Ku-Band Geostationary Satellites
Listing of C-Band Geostationary Satellites
C-Band Geostationary Satellites
Listing of U.S. Cities and Rain Zones
Mathcad Data Files
Mathematical Formulas
Scattering Two-Port Relationship
Impedance Two-Port Relationship
Admittance Two-Port Relationship
Trigonometric Identities
Series Expansions
Laplace Transform Pairs
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