No description, website, or topics provided.
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Type Name Latest commit message Commit time
Failed to load latest commit information.
logatec

The Wireless Testbed Academy contains source code that can be run on open wireless experimental testbeds. The following open experimentation/testing facilities are supported:

# Experiment description

The channel gain experiment shows how the gain between a transceiver and a receiver can be measured on a real testbed such as the ones mentioned above. Simple cognitive radio source code

##Methodology for measuring the gain between two nodes

We consider a system formed by a single transmitter-receiver pair: TXi - RXj

``````    	+------+          +------+
| TXi  | --hij--> | RXj  |
+------+          +------+
|		         |
|                 |
_|_               _|_

Fig. 1 hij - the channel gain between
``````

The procedure for measuring the channel gain is as follows:

• First, the receiver RXj measures the received power Pnoise knowing that the transmitter TXi is silent.

• Secondly, the receiver measures the received power PRXj knowing that the transmitter is transmiting with a given power PTXi

• The gain is then computed according to the formula:

``````    hij = (PRXj - Pnoise) / (PTXi) where:

- PTXi [W] is the power transmitted by transmitter i
- Pnoise [W] is the noise power.

+------+                          +------+
| TXi  | ----------hij----------> | RXj  |
+------+                          +------+

Fig.2 Ideal situation, where in the system there is no noise power

hij = PRXj / PTXi

+------+                   +-----+        +------+
| TXi  | ----------hij-----| ADD |------> | RXj  |
+------+                   +-----+        +------+
^
|
|
+-------+
| noise |
+-------+

Fig.3 Real situation, where the noise signal adds to the transmitted signal

hij = (PRXj - Pnoise) / (PTXi)
``````

# Steps to follow in order to measure the gain between two nodes:

1. Measure the noise power. No signal should be generated by the transmitter during this step.
2. Generate a signal.