Apparatus and method for receiving signal in communication system supporting Gaussian frequency shift keying modulation scheme

摘要

An apparatus and a method are provided for receiving a signal in a communication system supporting a Gaussian frequency shift keying (GFSK) modulation scheme. The method includes receiving the signal; and estimating a codeword vector by performing a signal detecting operation based on a GFSK-maximum likelihood sequence estimation (MLSE) scheme, which is based on a GFSK modulation scheme and an MLSE scheme, on the received signal. States of a Viterbi trellis that are used in the GFSK-MLSE scheme are determined based on the GFSK modulation scheme.

主权项

1. A method for receiving a signal by an signal receiving apparatus in a communication system supporting a Gaussian frequency shift keying (GFSK) modulation scheme, the method comprising:
receiving, by the signal receiving apparatus, the signal from a signal transmitting apparatus; and estimating, by the signal receiving apparatus, a codeword vector of the received signal by performing a signal detecting operation based on a GFSK-maximum likelihood sequence estimation (MLSE) scheme, which is based on a GFSK modulation scheme and an MLSE scheme, on the received signal,
wherein states of a Viterbi trellis that are used in the GFSK-MLSE scheme are determined based on the GFSK modulation scheme,
wherein performing the signal detecting operation comprises compensating for a frequency offset and a modulation index offset from a modulation index that is used in the GFSK scheme to estimate the codeword vector,
wherein compensating for the frequency offset and the modulation index offset comprises:updating a negative offset estimation value or determining a branch metric based on a negative offset estimation value for states in which a negative phase difference occurs, which are used in the GFSK-MLSE scheme; andupdating a positive offset estimation value or determining a branch metric based on a positive offset estimation value for states in which a positive phase difference occurs, which are used in the GFSK-MLSE scheme.