avrora.sim.radio
Class Channel

java.lang.Object
  avrora.sim.radio.Channel

public class Channel

extends java.lang.Object

The Channel class implements a serial channel that represents a communication channel where bits are sent one by one. The channel allows bits to be written into the channel at a particular time and represents their serial transmission over time by an array.

The channel is used in simulating radio transmissions; all transmissions write into the channel, and all samples read from the channel.

Field Summary

protected long	bitPeriod
protected int	bits
protected boolean[]	channelValues
protected boolean[]	channelWritten
protected long	globalTime
protected boolean	invert
protected long	period

Constructor Summary

Channel(int bits, long period, boolean invert)

Method Summary

void	advance() The advance() method advances the channel to the next period.
protected int	channelOffset(long gtime)
boolean	occupied(long start, long end) The occupied() method tests whether this channel has been written to in the window of time specified.
int	read(long time, int bits) The read() method reads the value of the channel at the current time, going back by the number of bits.
void	write(int value, int bits, long time) The write() method writes a value into the channel, with the given bit length at the given global time.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

bits

protected final int bits

period

protected final long period

bitPeriod

protected final long bitPeriod

globalTime

protected long globalTime

invert

protected final boolean invert

channelValues

protected final boolean[] channelValues

channelWritten

protected final boolean[] channelWritten

Constructor Detail

Channel

public Channel(int bits,
               long period,
               boolean invert)

Method Detail

write

public void write(int value,
                  int bits,
                  long time)

The write() method writes a value into the channel, with the given bit length at the given global time.

Parameters:

value - the value to write into the channel

bits - the number of bits to write

time - the global time at which the write takes place

advance

public void advance()

The advance() method advances the channel to the next period.

read

public int read(long time,
                int bits)

The read() method reads the value of the channel at the current time, going back by the number of bits.

Parameters:

time - the global time at which to read the channel

Returns:

a value representing the channel contents at this global time

occupied

public boolean occupied(long start,
                        long end)

The occupied() method tests whether this channel has been written to in the window of time specified.

Parameters:

start - the start of the interval to check

end - the end of the interval to check

Returns:

true if the channel was written to during the specified time interval; false otherwise

channelOffset

protected int channelOffset(long gtime)