Wireless Communication Techniques: OFDM, Diversity, and Propagation
Wireless Communication Techniques
1️⃣ Orthogonal Frequency Division Multiplexing (OFDM)
Definition:
OFDM is a multi-carrier modulation (MCM) technique where the total bandwidth is divided into multiple orthogonal subcarriers to reduce Inter-Symbol Interference (ISI) and enhance data transmission efficiency.
Block Diagram:
Transmitter:
Input Data → Serial-to-Parallel → Modulation (QAM/PSK) → IFFT → Cyclic Prefix Addition → Parallel-to-Serial → TransmissionReceiver:
Received Signal → Serial-Electrical Line Clearance: Safety Distances & Grounding
Post Neutral Grounding
The neutral conductor of airline distribution networks of utilities will be connected to ground at the processing center or power generating plant. Also, in the distribution patterns TT and TN type, driver neutral and protection scheme for TN-S, must be grounded elsewhere, and at least once every 500 meters of line length.
General Conditions for Crossing Lines
1.2 Crossing Other AC Electrical Lines
When bare conductor lines are established on different supports, the distance between
Read MoreHygiene and Skin Lesions
Hygiene and Cleanliness
Hygiene and cleanliness are concepts aimed at preventing disease and preserving health.
Postural Hygiene
Proper posture to avoid injuries during daily activities or work.
Occupational Hygiene
Conservation measures for health in the workplace.
The Necessity of Hygiene as Basic Health
Virginia Henderson framed hygiene within the basic needs of individuals. Maslow set physiological needs, including thermoregulation, as a priority. The skin plays an important, essential role when in
Read MoreEssential Guide to ISO Standards, Audits, and Material Handling
Environmental Audit (ISO 14000)
An Environmental Audit is a systematic evaluation of an organization’s compliance with environmental regulations, policies, and performance standards. It helps businesses identify environmental risks, improve sustainability, and ensure regulatory compliance.
ISO 14000 & Environmental Audits
ISO 14000 is a set of international standards for Environmental Management Systems (EMS) developed by the International Organization for Standardization (ISO).
The most crucial
Read MoreJournal Entries and Accounting Scenarios Explained
Accounting Transactions
Initial Balances:
Box: 8,000, Bank: 53,000, Merchandise: 16,000, Effects C BC: 3,400, Clients: 14,000, Furniture: 8,000, Machinery: 10,000, Element Tran: 90,000, HP receivable: 7,000, SS Creditors Agency: 3,000, Suppliers: 17,500, C purposes P: 12,900, Creditors: 8,000, Capital: 254,000
Transaction 1
Supplier to deliver 1,500 € (+ tax) on account of a purchase within 15 days.
Journal Entry:
Advance to Supplier: 500 (407), TAX SOPRTE: 750, Bank: 1575 (572)
Transaction 2
Purchase
Read MorePhotosynthesis: Unveiling the Z-Scheme and Light Reactions
Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy from the sun into chemical energy in the form of glucose (a type of sugar) and oxygen. This process is crucial for the sustenance of life on Earth, as it is responsible for producing the oxygen we breathe and providing the primary source of food for many organisms.
Photosynthesis takes place in the chloroplasts of plant cells, specifically in structures called thylakoids, which are disk-like membranes
Read MoreCryptography, Socket Programming, and Python OOP Concepts
Cryptography, Socket Programming, and Python OOP
| Base64 Encoding | Base64 Decoding |
|---|---|
import base64 #encoding |
import base64 #decoding |
Ciphers and Encoding
|
Hume’s Principles: Empiricism, Ideas, and Reality
Hume: Key Principles
Hume’s Empirical Principle: There is nothing in the mind that has not first occurred through the senses.
Principle of Immanence: The senses are merely conduits, transmitting images without creating a direct contact between the mind and the object.
Principle of “Copy”: All our ideas are copies of our impressions. It is impossible to think of something we have not felt before, either internally or externally.
Principle of Association of Ideas: Ideas are not isolated in the mind. Imagination
Read MoreThe Spanish Civil War: A Summary of Events
The Spanish Civil War
Military Developments
Stages of the Conflict
The rebel army held the strategic initiative from the outset. The first day consolidated fronts in the Sierra de Madrid, Andalusia, and Aragon, which remained relatively stable throughout the conflict.
1) The Madrid Campaign
The rebels awaited the transfer of the Army of Africa. The loyalist fleet controlled the Strait of Gibraltar, but German and Italian aid allowed rebel troops to land. They gradually occupied parts of Andalusia and
Read MoreBasketball Rules: Court Specs and Foul Types
Basketball Definition
Basketball is a game played between two teams of five players each on a regulation court. The objective is to score points by shooting a ball through a hoop elevated 3.05 meters above the ground, primarily by bouncing the ball while moving.
Dimensions and Materials
Court Specifications
- Dimensions: 28 meters in length and 15 meters in width (minimum 26m x 14m).
- Minimum Ceiling Height: 7 meters.
- Lines: All lines must be 5 cm wide and drawn in the same color (preferably white).
Backboards
- Size: