Data Detection Method and Data Detector for Signals Transmitted Over a Communication Channel With Inner-Symbol Interference

摘要

A data detection method, having the steps of: a. receiving a signal transmitted over a communication channel, the signal being representative of at least a stream of interfering symbols xk, each representing one or more bits of a transmitted message; b. filtering the received signal through at least a filter bank having at least a first filter representative of a linear response of the channel and a second filter representative of a non-linear response of the channel, and sampling the filtered signals at the symbol rate, thus obtaining respective sequences of filtered samples rk(1) rk(3); and c. jointly computing the a posteriori probabilities of N>1 consecutive symbols xk. A data detector for carrying out such a method, and a method of transmitting data over a nonlinear channel, optimizing spectral efficiency when data detection is performed using such a method is also provided.

主权项

1. A data detection method, comprising the steps of:
a. receiving a signal transmitted over a communication channel, said signal being representative of at least a stream of interfering symbols xk, each representing one or more bits of a transmitted message; b. filtering the received signal through at least a filter bank comprising at least a first filter representative of a linear response of said channel and a second filter representative of a non-linear response of said channel, and sampling the filtered signals at the symbol rate, thus obtaining respective sequences of filtered samples rk(1),rk(3); and c. jointly computing the a posteriori probabilities of N>1 consecutive symbols xk by applying the sum-product algorithm to a probability mass function expressed by the product of N terms, each being associated to a symbol xk and being proportional to the product of an indicator function, an a priori probability, a first function representing the inter-symbol interference due to the Q symbols which precede said symbol xk and of a second function representing the inter-symbol interference due to the (L−Q) symbols immediately preceding said Q symbols which precede symbol xk; where:
L is an integer greater than zero, representing the memory of the communication channel;Q is an integer greater than zero and not greater than L, serving as a design parameter;thus realizing simultaneous soft-input-soft-output detection of a packet of N symbols of the transmitted message.