Patent ID: 8223897
Filing Date: 2012-07-17
Classification: H04L

Abstract:
1. A method for use in a communications receiver that is adapted to process a received communication signal, wherein the received communication signal provides a channel-distorted version of a communication signal that has been encoded in accordance with at least an in-phase component signal (x I (t) signal), wherein for at least two discrete sample times, t, in each of a plurality of symbol intervals, including a k th symbol interval (kT≦t<(k+1)T), where L is a positive integer and L≦7, T is a symbol interval duration, k and j are integer counting variables, p Q Q (t)=m Q Q (t) h(t) is a compact pulse shape whose length is no longer than (L+1)T, h(t) is a finite impulse response filter whose impulse response has a length no longer than LT, m Q Q (t) is a state transition signal of a first real-valued baseband message signal (m I (t) signal) from a state Q(k−j+1) to a state Q(k−j+2), the m 1 (t) signal follows a first trajectory through an amplitude trellis in accordance with a binary data sequence that has been trellis encoded therein, and the first trajectory passes through a first particular sequence of trellis states, Q 0 , Q 1 , . . . Q k , at discrete times, kT, the method comprising: receiving the received communication signal from a channel, extracting at least an in-phase baseband component signal (Z computing, for the k implementing a trellis decoding algorithm using at least the k