JPL's Wireless Communication Reference Website

List of Symbols.

List of Symbols

The editors of this CD ROM attempt to comply to a consistent notation and use of symbols throughout this CD ROM. This task is particularly appreciated by the readers, but it was sometimes received a little less enthousiastically by authors of proposed contributions to this CD ROM. As you will see in the table, double use of certain symbols appeared unavoidable, unless we added lengthy subscripts which would lead to a cluttered mathematical notation. We tolerated such double usage if confusion is unlikely, thus, if it is unlikely that both uses would occur in the same page.

The following list is not complete. If you are a prospective author, please consult the Editor-in-Chief.

Symbol Definition Unit Remarks
B Erlang B Blocking Probabilitynone 0 = B = 1
B Average duration of a busy cycle in CSMA or ISMAnone
Bc Coherence BandwidthHz
BT Transmit BandwidthHz
c speed of lightm/s3 108 m/s
C Frequency Reuse Cluster Sizenone
C0 Amplitude of line-of-sight or dominant component in Rician fadingnone, volts, amperes, ..
d Propagation distance (see for instance Free Space Loss, Path Loss) meters
D Delay
d Delay between channel sensing and transmitter power up in CSMA, ISMAnone, relative to packet duration
f, fc Carrier frequency Hertz (sec-1) fc > 0
fD Doppler spread. The maximum Doppler shift experienced in a multipath channel. Hertz (sec-1) fD = 0
G Offered (or attempted) packet traffic in random access network, ALOHAPackets per slot
G(r) Offered (or attempted) packet traffic per unit area in random access network, ALOHAPackets per slot per area
hr, hr Receive / Transmit antenna Heightmeters
I0() Modified Bessel function of first kind and zero order (see Rice PDF.)
J0() Bessel function of first kind and zero order (see amplitude correlation.)
K Rician K-factor
Ratio of power in dominant (LOS) component over power in scattered waves.
none K = 0
Rayleigh fading: K=0
m Nakagami m-factor
nonem = 1
Rayleigh fading: m=1
n(t) noise signalnone, volts, amperes, ..
N0 Spectral Power Density of AWGN noise watts/Hz
p Persistency parameter in CSMA
Pb Bit Error Rate
p0, pi Instantaneous received signal power from terminal 0, i none (normalized to unity average power from cell boundary), watts
0, i Local-mean received signal power from terminal 0, i none (normalized to unity power from cell boundary), watts
r
  • distance (see also d)
  • signal amplitude (see also r)
  • normalized to cell size or meters
  • normalized or volts, volts/meter, amperes, etc.
S Successful packet traffic / Throughput in random access network, ALOHAPackets per slot
S(r) Successful packet traffic / Throughput per unit area in random access network, ALOHAPackets per slot per area
TRMS RMS delay spread seconds
 Greek Symbols
r, r, r(t) signal amplitude depending on application: normalized, volts, volt/meter, amperes, etc.
s2 variance, variance of inphase and quadrature component of Rayleigh fading amplitude, local-mean power.



JPL's Wireless Communication Reference Website 1999.