Patent ID: 7529323
Filing Date: 2009-05-05
Classification: H04L

Abstract:
1. A receiver for demodulating a received signal generated by a modulator providing quaternary precoding and quaternary continuous phase modulation of a binary bit sequence, the receiver for providing an estimate of the bit sequence, the receiver comprises a demodulator comprising, a bank of filters for providing a matched filter response of pulse-amplitude modulation components of the received signal, the received signal being a quaternary continuous phase modulation signal, a sampler for sampling the matched filter response for providing samples, and a generator for generating log-likelihood-ratio-based soft bit metrics ρ wherein, the generator outputs ρ and where u (i) for i∈{i 1 , i 2 , j 1 , j 2 } are quaternary data sequences achieving the respective maximums and {a (i) 1,k , a (i) 2,k } are bit values associated with the quaternary data sequences for an index k, NT being an observation window where N is a number of symbols and T is a symbol time, r(t) being the received signal, S( ) being a waveform corresponding to a path in a constraint trellis.