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## avrora.sim.radio.freespace
Class FreeSpaceAir

    java.lang.Object
      avrora.sim.radio.freespace.FreeSpaceAir

All Implemented Interfaces:
  RadioAir

public class FreeSpaceAir
extends java.lang.Object
implements RadioAir

Implementation of the free space radio propagation model

Nested Class Summary
`protected class` | `FreeSpaceAir.MeetEvent`

Field Summary
`static int` | `bitPeriod`
`static int` | `bitPeriod2`
`static int` | `bytePeriod` The amount of cycles it takes for one byte to be sent.
`protected java.util.HashSet` | `radios`

Constructor Summary
`FreeSpaceAir(Topology top)` new free space air

Method Summary
`void` | `addRadio(Radio r)` The `addRadio()` method adds a new radio to this radio model.
`Synchronizer` | `getSynchronizer()` The `getSynchronizer()` method gets the synchronizer for this air implementation.
`byte` | `readChannel(Radio r)` The `readChannel()` method reads the value of the channel at the current time so that the last 8 bits transmitted (where the bits are 0 if there are no transmissions) are returned.
`void` | `removeRadio(Radio r)` remove radio
`int` | `sampleRSSI(Radio r)` see simple air for more
`void` | `transmit(Radio r, Radio.Transmission f)` transmit packet

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### radios

    protected final java.util.HashSet radios

### bytePeriod

    public static final int bytePeriod

  The amount of cycles it takes for one byte to be sent.

  See Also:
    Constant Field Values

### bitPeriod

    public static final int bitPeriod

See Also:
  Constant Field Values

### bitPeriod2

    public static final int bitPeriod2

See Also:
  Constant Field Values

Constructor Detail

### FreeSpaceAir

    public FreeSpaceAir(Topology top)

  new free space air

Method Detail

### addRadio

    public void addRadio(Radio r)

  Description copied from interface: `RadioAir`
  The `addRadio()` method adds a new radio to this radio model.

  Specified by:
    `addRadio` in interface `RadioAir`
  Parameters:
    `r` - the radio to add to this air implementation

### removeRadio

    public void removeRadio(Radio r)

  remove radio

  Specified by:
    `removeRadio` in interface `RadioAir`
  Parameters:
    `r` - the radio to remove from this air implementation
  See Also:
    `RadioAir.removeRadio(avrora.sim.radio.Radio)`

### transmit

    public void transmit(Radio r,
                         Radio.Transmission f)

  transmit packet

  Specified by:
    `transmit` in interface `RadioAir`
  Parameters:
    `r` - the radio transmitting this packet
    `f` - the radio packet transmitted into the air
  See Also:
    `RadioAir.transmit(avrora.sim.radio.Radio, avrora.sim.radio.Radio.Transmission)`

### sampleRSSI

    public int sampleRSSI(Radio r)

  see simple air for more

  Specified by:
    `sampleRSSI` in interface `RadioAir`
  Parameters:
    `r` - the radio sampling the RSSI value
  Returns:
    an integer value representing the received signal strength indicator
  See Also:
    `RadioAir.sampleRSSI(avrora.sim.radio.Radio)`

### readChannel

    public byte readChannel(Radio r)

  Description copied from interface: `RadioAir`
  The `readChannel()` method reads the value of the channel at the current time so that the last 8 bits transmitted (where the bits are 0 if there are no transmissions) are returned.

  Specified by:
    `readChannel` in interface `RadioAir`
  Parameters:
    `r` - the radio sampling the channel
  Returns:
    the last 8 bits transmitted in the channel

### getSynchronizer

    public Synchronizer getSynchronizer()

  Description copied from interface: `RadioAir`
  The `getSynchronizer()` method gets the synchronizer for this air implementation.

  Specified by:
    `getSynchronizer` in interface `RadioAir`
  Returns:
    a reference to the synchronizer for this radio model.

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