IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0332968
(1989-04-04)
|
우선권정보 |
FR-0004682 (1988-04-08) |
발명자
/ 주소 |
- Albrieux Vincent (Paris FRX) Soufflet Didier (Montrouge FRX)
|
출원인 / 주소 |
- LMT Radioprofessionnelle (Boulogne-Billancourt FRX 03)
|
인용정보 |
피인용 횟수 :
112 인용 특허 :
1 |
초록
▼
A demodulator to demodulate a complex signal formed by two carriers, in quadrature, the spectrum of which is spread by a pseudo-random signal, and which are modulated by an M-ary, Walsh, code comprises: a chain of registers to store 256 bits of a pseudo-random signal; a multiplexer to temporally mul
A demodulator to demodulate a complex signal formed by two carriers, in quadrature, the spectrum of which is spread by a pseudo-random signal, and which are modulated by an M-ary, Walsh, code comprises: a chain of registers to store 256 bits of a pseudo-random signal; a multiplexer to temporally multiplex the processing of the two carriers; a chain of correlation macro-cells having a systolic structure enabling temporal multiplexing and having intermediate outputs providing for partial correlation values on 16 chips; a device for the computation of linear combinations of the functions of partial correlation, to compute two functions of correlation corresponding to two carriers for each M-ary code; a demultiplexing and computation device to compute the module of the function of correlation for each of the Walsh codes which may modulate the signal to be demodulated; a device for the selection of the greatest value of the correlation functions and for the selection of the corresponding piece of data.
대표청구항
▼
An asynchronous, digital correlator to correlate a binary reference signal (REF) with a complex signal formed by a first carrier and second carrier (I, Q), modulated by a pseudo-random function and by an M-ary orthogonal encoding, said two carriers being sampled and digitized, said correlator compri
An asynchronous, digital correlator to correlate a binary reference signal (REF) with a complex signal formed by a first carrier and second carrier (I, Q), modulated by a pseudo-random function and by an M-ary orthogonal encoding, said two carriers being sampled and digitized, said correlator comprising: a multiplexer to transmit, alternately, a value (I) of the first carrier, and a value (Q) of the second carrier, with a period equal to half their sampling period; a first digital filter adapted to the pseudo-random function (PN), comprising a chain of registers to store L consecutive bits of the reference signal (REF) and a chain of M correlation macro-cells receiving the sequence of multiplexed values of the first carrier and the second carrier (I and Q), each macro-cell computing the value (CPI0,..., CPI15) of a first function, called a partial correlation function, between N bits of the reference signal and N values of the first carrier (I), and then computing the value (CPQ0,..., CPQ15) of a second function, called a partial correlation function, between N bits of the reference signal and N values of the second carrier (Q), N being equal to L/M; a second digital filter adapted to at least one of the M-ary encoding codes and having computation means to determine the value of at least one linear combination of the values of the first functions of partial correlation (CPI0,... CPI15); and then to determine the value of a linear combination of the values of the second functions of partial correlation (CPQ0,..., CPQ15), the coefficients of the linear combination being unchanged and being equal to ±1; and having means to demultiplex the values of the two linear combinations (FIi, FQi), and to determine the modulus (Fi) of a vector having, as its components, the values of these two linear combinations (FIi, FQi).
※ AI-Helper는 부적절한 답변을 할 수 있습니다.