CDMA Reference Blockset

IS-95A Rev Ch Walsh Correlator

Correlate the input sequence with a bank of Walsh sequences for the reverse Access and Traffic channels

Library

IS-95A Base Station Receiver

Description

This block correlates the input sequence with a bank of Walsh sequences for the reverse Access and Traffic channels. The number of correlators is 2^W, where W is the Walsh order parameter. The Walsh sequences used in the correlators are mutually orthogonal.

The input comprises the received Walsh symbol(s), where each Walsh symbol is of the same length as a Walsh sequence. The block correlates each input Walsh symbol with all possible Walsh sequences.

The output of the correlator comprises the output of all correlators for all Walsh symbols input. Therefore, the first 2^Woutput values correspond to the correlation results for the first input Walsh symbol with all the Walsh sequences, the second 2^Woutput values correspond to the correlation results for the second input Walsh symbol with all the Walsh sequences, and so forth.

Inputs

Real vector representing the input sequence to be correlated. The vector size is Number of input symbols * 2^W.

Outputs

Real vector representing the output of 2^W Walsh correlators. The vector size is a multiple of 2^W. The default vector size is 2⁶.

Dialog Box

Parameters

Walsh order

Real integer that specifies the order of the Walsh code.

Number of input symbols

Integer scalar that specifies the number of input Walsh symbols.

See Also

IS-95A Rev Ch Walsh Modulation and Spreading
IS-95A Rev Ch Walsh Demodulator
IS-95A Rev Ch Rake Finger

IS-95A Rev Ch Viterbi Decoder

IS-95A Rev Ch Walsh Demodulator