[특허]System for reducing the affects of signal fading on received signals

System for reducing the affects of signal fading on received signals 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04B-007/02 H04L-001/02
출원번호	US-0652419 (1991-02-07)
우선권정보	SE-0000566 (1990-02-16)
발명자 / 주소	Bckstrm Tomas O. (Kista) Kahre Ragnar E. (Kvlinge) Stiernvall Jan-Erik (Sollentuna SEX)
출원인 / 주소	Telefonaktiebolaget L M Ericsson (Stockholm SEX 03)
인용정보	피인용 횟수 : 46 인용 특허 : 0

초록 ▼

Signals in synchronizing sequences and data sequences are transmitted over a fading channel to a Viterbi-receiver. The signals are received by antennas and sampled to received antenna signals (sin,r(k)). Part channel estimates (hest,r) for the individual antennas are formed. For Viterbi-analysis, assumed input signals (sa,r(Dij,k)) for the data sequence are produced with the aid of the part channel estimates (hest,r). Part metric values (mr(Dij, k)) are formed as a difference between the received antenna signal (s, in,r(k)) and corresponding assumed input signals (sa,r(Dij, k)) for Viterbi state transitions (Dij). For one state transition there is formed a metric value such as the sum of a metric value ((M(Tj, k-1)) for an old state (Tj) at a preceding sampling time point (k-1) increased with a weighted (Kr) sum of the part metric values (mr(Dij, k)) belonging to individual part channel estimates (hest,r). Corresponding metric values are formed for all state transitions to the new state (Ti) and the smallest of these metric values is chosen in accordance with the Viterbi-algorithm.

대표청구항 ▼

A system for reducing the affects of signal fading on a receiver, comprising: plural, mutually spaced apart antennas, for receiving radio signals including a sequence of digital symbols over a communications channel; means for sampling signals generated by said antennas; means for generating partial estimates corresponding to and based on said antenna signals and an associated set of assumed symbols; and means for processing said antenna signals to generate over a number of state transitions a sequence of estimated symbols corresponding to said receiving digital symbols, said processing means including: means for calculating each state transition a set of postulates based on said antenna signals and said partial estimates; means for determining partial confidence factors corresponding to each partial estimate and said postulates; means for calculating each state transition between an old and a new state, a current confidence factor from a preceding confidence factor corresponding to said old state and weighted sum of said partial confidence factors; and means for analyzing said current confidence factors and for selecting an optimal, current confidence factor at said transition to said new state.

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