Code division multiplex signal receiving method
US5638376A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1995 |
| Grant date | Jun 10, 1997 |
| Priority date | — |
| Expiry date | Aug 28, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/71052
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A determinant, which represents the relationship between a sequence of code division multiplexed transmission symbol vectors b(k) from L communicators and a sequence of despread output vectors y(k) of received signals taking into account the cross correlation between spreading code sequences of transmitted signals, is limited within the range of .+-.g symbol duration about symbol timing k, and despread outputs of received signals within the limited range are inputted into a 2g+1-stage shift register. On the other hand, partial correlation matrixes R.sup.k+h (1), R.sup.k+h (0) and R.sup.k+h (-1) for each symbol duration within the limited range are calculated by a partial correlation computing part with respect to h=-g, . . . , g, then a correlation matrix R.sup.k between the spreading code sequences corresponding to the L communicators is derived from the partial correlation matrixes in an inverse matrix computing part and an inverse correlation matrix R.sub.k.sup.-1 of the correlation matrix is calculated. The inverse correlation matrix R.sub.k.sup.-1 and a sequence Y.sup.k of the despread outputs y(k) from the shift register are multiplied by a multiplier to obtain an estimated s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.