Patent ID: 7492839
Filing Date: 2009-02-17
Classification: H03M,H04L

Abstract:
1. A method of estimating at least one transmitted MSK symbol by a Viterbi equalizer at a wireless receiver, the transmitted MSK symbols being alternately real and imaginary, the Viterbi states possible at the stages corresponding to real symbols constituting a first set of states, the Viterbi states possible at the stages corresponding to imaginary symbols constituting a second set of states, the method comprising the steps of: a. obtaining only the imaginary parts of the autocorrelation values of the channel impulse response corresponding to a time delay of odd number of stages; b. obtaining only the real parts of the autocorrelation values of the channel impulse response corresponding to a time delay of even number of stages; c. pre-computing an estimated ISI term for all Viterbi states using the real and imaginary parts obtained at steps (a) and (b); d. advancing the Viterbi trellis by a stage comprising the steps of: