Diversity transmission in a mobile radio system

Patent 6636495 Issued on October 21, 2003. Estimated Expiration Date:

July 15, 2019. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

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Inventor

Tangemann, Michael

Assignee

Alcatel

Application

No. 09/353354 filed on 07/15/1999

US Classes:

370/334, Using multiple antennas at a station370/332, Based upon a particular signal quality measurement370/335, Combining or distributing information via code word channels using multiple access techniques (e.g., CDMA)375/299, Plural diversity455/561, Base station detail455/562.1Having specific antenna arrangement

Examiners

Primary: Trost, William
Assistant: Tran, Congvan

Attorney, Agent or Firm

Sughrue Mion, PLLC

International Classes

H01Q 1/24 (20060101)
H01Q 3/26 (20060101)
H04B 7/06 (20060101)
H04B 7/04 (20060101)
H04B 7/02 (20060101)
H04B 7/10 (20060101)

Foreign Application Priority Data

1999-06-24 EP

Abstract

In a known diversity transmission method, two signals with different identifications are transmitted via two spaced antennas. To be able to apply the diversity principle to more than two antennas, a novel method and a novel base station are proposed. The novel base station comprises two transmitting apparatuses and an assignment apparatus connected thereto which establish connections between each of the two transmitting apparatuses and each of the antennas. The base station further comprises a computing and control apparatus that is connected to the assignment apparatus, which divides the antennas into a first antenna group and a second antenna group, and controls the switching of the connections in such a way that the first antenna group is connected to the first transmitting apparatus, and the second antenna group to the second transmitting apparatus. By several different divisions of the antennas into a first antenna group and a second antenna group, the amplitude and phase differences (phi) existing between the signals at the receiver can be compensated for even if more than two antennas are used. It is also possible to determine that grouping of the antennas with which the highest diversity gain is achieved.