What is decode and forward relay?
Decode-and-Forward (DF): In this relaying scheme, the relay decodes the source message in one block and transmits the re-encoded message in the following block. The achievable rate of DF is known as .
What is amplify and forward relay?
Amplify-and-Forward (AF) is a simple cooperative strategy for ad-hoc networks with critical power constraints. It involves an amplification of the received signal in the analogue domain at the relays without further signal processing.
What is af relay?
Most common relaying strategies are decode-and-forward (DF) and amplify-and-forward (AF). While a DF relay decodes, re-modulates and retransmit the received signal, an AF one simply amplifies and retransmit the signal without decoding.
What is amplify and forward protocol?
Amplify and forward relaying protocol design with optimum power and time allocation. Abstract: Parameter optimization such as power and time allocation plays an important role in emerging cooperative relaying protocol designs, especially when the environment is congested and contested.
What is a 4 channel relay?
The 4 Channel Relay Module is a convenient board which can be used to control high voltage, high current load such as motor, solenoid valves, lamps and AC load. It is designed to interface with microcontroller such as Arduino, PIC and etc. It also comes with a LED to indicate the status of relay.
What is a 2 channel relay?
The relay has two outputs-normally open and normally closed (NO and NC). Connecting a circuit or device between one of these two pins, the common pin on the relay output, and a power source will allow you to toggle power to a circuit or device.
What is 6V relay?
The 6v relay is an electromechanical switching device which controls the AC devices through the DC power. Features of Relay 6V: Max Current: 5A AC/DC (max). Max Voltage: 250V AC/30V DC. Nominal Voltage: 6V.
What is the difference between 1 channel and 2-channel relay?
A 1-channel relay board can switch one load, a 2-channel relay board can switch two loads independently.
How does latching relay work?
A latching relay is a two-position electrically-actuated switch. It is controlled by two momentary-acting switches or sensors, one that ‘sets’ the relay, and the other ‘resets’ the relay. The latching relay maintains its position after the actuating switch has been released, so it performs a basic memory function.
How does a relay decode and forward a signal?
The relay decodes and re-encodes the received signal, then it forwards it to the destination. This processing of the signal at the relay is also know as making a hard decision, as the information sent by the relay does not include any additional information about the reliability of the source-relay link.
Which is an example of a decode and forward protocol?
The decode-and-forward relay protocol is a protocol defined for wireless cooperative communications. An example of a wireless communication network in which cooperation improves the performance of the system is the relay network. The relay decodes and re-encodes the received signal, then it forwards it to the destination.
What is the DF relay function in BPSK?
For BPSK modulation the DF relay function is where sgn is the sign function. Notice that this relay function depends only on the received signal , and does not incorporate any information about the quality of the S-R channel, or about how accurate the relay decoding is.