Method, apparatus and computer program for controlling a receiver
US9036681B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 4, 2013 |
| Grant date | May 19, 2015 |
| Priority date | — |
| Expiry date | Oct 4, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/7105
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Linear symbol level equalisation is used to estimate a transmitted symbol vector xn(0) in an nth observation window yn of signals received from multiple users each using a different spreading code. An iterative conjugate gradient algorithm resolves a column vector z that satisfies Az=b, A being a square matrix and b being a column vector. The matrix vector product Apk used in each respective kth iteration of the algorithm is computed using at least one fast transform. The receiver or detector estimates a posterior mean {circumflex over (x)}LMMSE,n(0) from the computed column vector z, then utilises the estimated posterior mean to determine the transmitted symbol vector xn(0). The posterior mean {circumflex over (x)}LMMSE,n(0) may be estimated from matrix A and vector b. Different examples have the square matrix A with an inner or an outer product form; and have the fast transform as a fast Walsh-Hadamard transform and/or a fast (inverse) Fourier transform.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.