Communications Toolbox

Functions by Category

Table 3-1: Signal Sources 

Function	Purpose
randerr	Generate bit error patterns
randint	Generate matrix of uniformly distributed random integers
randsrc	Generate random matrix using prescribed alphabet
wgn	Generate white Gaussian noise

Table 3-2: Signal Analysis Functions 

Function	Purpose
biterr	Compute number of bit errors and bit error rate
eyediagram	Generate an eye diagram
scatterplot	Generate a scatter plot
symerr	Compute number of symbol errors and symbol error rate

Table 3-3: Source Coding 

Function	Purpose
compand	Source code mu-law or A-law compressor or expander
dpcmdeco	Decode using differential pulse code modulation
dpcmenco	Encode using differential pulse code modulation
dpcmopt	Optimize differential pulse code modulation parameters
lloyds	Optimize quantization parameters using the Lloyd algorithm
quantiz	Produce a quantization index and a quantized output value

Table 3-4: Error-Control Coding 

Function	Purpose
bchpoly	Produce parameters or generator polynomial for binary BCH code
convenc	Convolutionally encode binary data
cyclgen	Produce parity-check and generator matrices for cyclic code
cyclpoly	Produce generator polynomials for a cyclic code
decode	Block decoder
encode	Block encoder
gen2par	Convert between parity-check and generator matrices
gfweight	Calculate the minimum distance of a linear block code
hammgen	Produce parity-check and generator matrices for Hamming code
rsdecof	Decode an ASCII file that was encoded using Reed-Solomon code
rsencof	Encode an ASCII file using Reed-Solomon code
rspoly	Produce Reed-Solomon code generator polynomial
syndtable	Produce syndrome decoding table
vitdec	Convolutionally decode binary data using the Viterbi algorithm

Table 3-5: Lower-Level Functions for Error-Control Coding 

Function	Purpose
bchdeco	BCH decoder
bchenco	BCH encoder
rsdeco	Reed-Solomon decoder
rsdecode	Reed-Solomon decoding using the exponential format
rsenco	Reed-Solomon encoder
rsencode	Reed-Solomon encoding using the exponential format

Table 3-6: Modulation and Demodulation 

Function	Purpose
ademod	Analog passband demodulator
ademodce	Analog baseband demodulator
amod	Analog passband modulator
amodce	Analog baseband modulator
apkconst	Plot a combined circular ASK-PSK signal constellation
ddemod	Digital passband demodulator
ddemodce	Digital baseband demodulator
demodmap	Demap a digital message from a demodulated signal
dmod	Digital passband modulator
dmodce	Digital baseband modulator
modmap	Map a digital signal to an analog signal
qaskdeco	Demap a message from a QASK square signal constellation
qaskenco	Map a message to a QASK square signal constellation

Table 3-7: Special Filters 

Function	Purpose
hank2sys	Convert a Hankel matrix to a linear system model
hilbiir	Design a Hilbert transform IIR filter
rcosflt	Filter the input signal using a raised cosine filter
rcosine	Design a raised cosine filter

Table 3-8: Lower-Level Functions for Special Filters 

Function	Purpose
rcosfir	Design a raised cosine FIR filter
rcosiir	Design a raised cosine IIR filter

Table 3-9: Channel Functions 

Function	Purpose
awgn	Add white Gaussian noise to a signal

Table 3-10: Galois Field Computation 

Function	Purpose
gfadd	Add polynomials over a Galois field
gfconv	Multiply polynomials over a Galois field
gfcosets	Produce cyclotomic cosets for a Galois field
gfdeconv	Divide polynomials over a Galois field
gfdiv	Divide elements of a Galois field
gffilter	Filter data using polynomials over a prime Galois field
gflineq	Solve the linear equation Ax = b over a prime Galois field
gfminpol	Find the minimal polynomial of an element of a Galois field
gfmul	Multiply elements of a Galois field
gfplus	Add elements of a Galois field of characteristic two
gfpretty	Display a polynomial in traditional format
gfprimck	Check whether a polynomial over a Galois field is primitive
gfprimdf	Provide default primitive polynomials for a Galois field
gfprimfd	Find primitive polynomials for a Galois field
gfrank	Compute the rank of a matrix over a Galois field
gfrepcov	Convert one GF(2) polynomial representation to another
gfroots	Find the roots of a polynomial over a prime Galois field
gfsub	Subtract polynomials over a Galois field
gftrunc	Minimize the length of a polynomial representation
gftuple	Simplify or convert the format of elements of a Galois field

Table 3-11: Utilities 

Function	Purpose
bi2de	Convert binary vectors to decimal numbers
de2bi	Convert decimal numbers to binary vectors
erf	Error function
erfc	Complementary error function
istrellis	Check if the input is a valid trellis structure
marcumq	Generalized Marcum Q function
oct2dec	Convert octal numbers to decimal numbers
poly2trellis	Convert convolutional code polynomials to trellis description
vec2mat	Convert a vector into a matrix

Reference

Alphabetical List of Functions