System object: comm.GoldSequence
Package: comm
Generate a Gold sequence
Y = step(H)
Y = step(H,RESET)
Note
Starting in R2016b, instead of using the step method
to perform the operation defined by the System object™, you can
call the object with arguments, as if it were a function. For example, y
= step(obj) and y = obj() perform equivalent
operations.
Y = step(H) outputs a frame of the Gold
sequence in column vector Y. Specify the frame
length with the SamplesPerFrame property. The object
uses two PN sequence generators to generate a preferred pair of sequences
with period N = 2^n-1. Then the object XORs these sequences to produce
the output Gold sequence. The value in n is the degree of the generator
polynomials that you specify in the FirstPolynomial and SecondPolynomial properties.
Y = step(H,RESET) uses RESET as
the reset signal when you set the ResetInputPort property
to true. The data type of the RESET input must
be double precision or logical. RESET can be a
scalar value or a column vector with length equal to the number of
samples per frame specified in the SamplesPerFrame property.
When the RESET input is a non-zero scalar, the
object resets to the initial conditions that you specify in the FirstInitialConditions and SecondInitialConditions properties.
It then generates a new output frame. A column vector RESET input
allows multiple resets within an output frame. A non-zero value at
the ith element of the vector causes a reset at the ith output sample
time.
Note
obj specifies the System object on
which to run this step method.
The object performs an initialization the first time the step method
is executed. This initialization locks nontunable
properties and input specifications, such as dimensions,
complexity, and data type of the input data. If you change a nontunable
property or an input specification, the System object issues an
error. To change nontunable properties or inputs, you must first call
the release method to unlock the object.