The present invention provides linear MMSE equalization with parallel interference
cancellation for symbol determination in a forward link of a CDMA communication
system which has a plurality of code channels in use. Use of the linear MMSE equalization
with parallel interference cancellation of the present invention provides significantly
increased performance. The preferred method linearly filters a received signal
to form a first filtered signal (410), despreads and demodulates the first
filtered signal (415, 420) and provides a plurality of symbol estimates
for all corresponding code channels (430). An estimated transmitted signal
is generated from the plurality of symbol estimates (435), and with a channel
estimate (405), an estimated received signal is generated (440).
A residual signal is determined as a difference between the received signal and
the estimated received signal, is linearly filtered (445), and then combined
with the estimated transmitted signal to form a next, enhanced estimated transmitted
signal (450). This next estimated transmitted signal is despread (455,
460) and utilized to provide a next plurality of symbol estimates, for a selected
code channel of the plurality of channels, for subsequent use in error correction
and decoding, and further use by a subscriber (465, 475).