Space division multiple access radio communication system and method for allocating channels therein
US5909649A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 7, 1997 |
| Grant date | Jun 1, 1999 |
| Priority date | — |
| Expiry date | Jan 7, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/08
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In the preferred embodiment, a Space Division Multiple Access (SDMA) radio communication system (100) utilizes a base station (101) having a plurality of antenna elements (103) used to transmit and receive to multiple radio communication devices (107, 109) on a same frequency and time channel. A different set of beam forming weights is applied to communications for each radio communication device (107, 109) in such a way as to minimize the interference between the radio communication devices signals. A set of distance metrics is calculated utilizing the sets of weights for each pair of radio communication units sharing a channel. When any distant metric is less than a pre determined threshold value, one of the radio communication devices (107, 109) is reallocated to a new channel or a handover instruction is performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.