Linear minimum mean square error equalization with interference cancellation for mobile communication forward links utilizing orthogonal codes covered by long pseudorandom spreading codes
US6956893B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2001 |
| Grant date | Oct 18, 2005 |
| Priority date | — |
| Expiry date | Sep 14, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03605
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention provides linear MMSE equalization with parallel interference cancellation for symbol determination in a forward link of a CDMA communication system which has a plurality of code channels in use. Use of the linear MMSE equalization with parallel interference cancellation of the present invention provides significantly increased performance. The preferred method linearly filters a received signal to form a first filtered signal (410), despreads and demodulates the first filtered signal (415, 420) and provides a plurality of symbol estimates for all corresponding code channels (430). An estimated transmitted signal is generated from the plurality of symbol estimates (435), and with a channel estimate (405), an estimated received signal is generated (440). A residual signal is determined as a difference between the received signal and the estimated received signal, is linearly filtered (445), and then combined with the estimated transmitted signal to form a next, enhanced estimated transmitted signal (450). This next estimated transmitted signal is despread (455, 460) and utilized to provide a next plurality of symbol estimates, for a selected code channel of the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.