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Method and device for space division multiplexing of radio signals transmitted in cellular radio communications

  • US 6,240,098 B1
  • Filed: 02/20/1998
  • Issued: 05/29/2001
  • Est. Priority Date: 08/22/1995
  • Status: Expired due to Term
First Claim
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1. A method for space division multiplexing and demultiplexing of radio signals which are organized in frames and are transmitted in duplex between at least one base station and a plurality of mobile units communicating on a same frequency and time channel using a multipath receiver and transmitter integrated in the at least one base station and coupled to an antenna base, said method for non-gaussian radio signals comprising:

  • estimating spatial information relating to each mobile unit based on a radio signal received from a mobile unit in a single-transmission configuration by the multipath receiver, for reception and transmission frequencies using blind source separation methods, and based on the estimated spatial information;

    isolating by spatial filtering, possibly in a presence of multiple routes in a channel, respective routes to each mobile unit whose power is greater than a predetermined threshold to perform space division demultiplexing; and

    simultaneously transmitting in a direction of a main route of each mobile unit, a signal which is intended for the mobile unit, while protecting each mobile unit from signals transmitted to other mobile units by spatial filtering with cancelling constraints to perform the space division multiplexing.

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