Method and apparatus for transmitting communication signals using transmission space diversity and frequency diversity
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsDavid Anthony Smith, Håkan Gunnar Olofsson, Knut Magnus Almgren
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Abstract
A transmitter diversity assembly and an associated method for a radio transmitter. When coupled to a radio transmitter to form a portion thereof, signal diversity is created to overcome multi-path fading. A plurality of antennas are freely selectable to be coupled to receive bursts of a communication signal, modulated to be transmitted on any of selected carriers. By altering the carriers upon which the bursts of the communication signal are transmitted and the spatially-separated antennas used to transduce the bursts of the communication signal, both transmission space diversity and frequency diversity is created.
Claims18
A frequency hopping method for transmitting a communication signal generated at a communication station upon selected communication channels of a set of communication channels, said communication signal comprising a plurality of bursts, said method comprising the steps of:
- selecting a first antenna from a set of antennas for a first burst;
- determining a first frequency for said first burst;
- transducing said first burst via only said first antenna and at said first frequency;
- selecting a second antenna from said set of antennas for a second burst based, at least in part, on said first antenna;
- determining a second frequency for said second burst based, at least in part, on said first frequency;
- transducing said second burst via only said second antenna and at said second frequency;
- and
- wherein said steps of selecting a second antenna and determining a second frequency are further based, at least in part, on a history of antennas of said set of, antennas and a history of frequencies via which and at which, respectively, said communication signal has previously been transduced.
A frequency hopping method for transmitting a communication signal generated at a communication station upon selected communication channels of a set of communication channels, said communication signal comprising a plurality of bursts, said method comprising the steps of:
- selecting a first antenna from a set of antennas for a first burst;
- determining a first frequency for said first burst;
- transducing said first burst via only said first antenna and at said first frequency;
- selecting a second antenna from said set of antennas for a second burst based, at least in part, on said first antenna;
- determining a second frequency for said second burst based, at least in part, on said first frequency;
- and
- wherein a difference between said first and second frequencies approximately exceeds a coherence bandwidth in order to create frequency diversity while transducing said communication signal.
A frequency hopping method for transmitting a communication signal generated at a communication station upon selected communication channels of a set of communication channels, said communication signal comprising a plurality of bursts, said method comprising the steps of:
- selecting a first antenna from a set of antennas for a first burst;
- determining a first frequency for said first burst;
- transducing said first burst via only said first antenna and at said first frequency;
- receiving information regarding a fading characteristic of a communication channel corresponding to said first antenna and said first frequency;
- selecting a second antenna from said set of antennas for a second burst based, at least in part, on said information regarding said fading characteristic;
- determining a second frequency for said second burst based, at least in part, on said information regarding said fading characteristic;
- transducing said second burst via only said second antenna and at said second frequency;
- and
- wherein said steps of selecting a second antenna and determining a second frequency are further based, at least in part, on a history of information regarding fading characteristics of at least one communication channel of said set of communication channels.
A frequency hopping method for transmitting a communication signal generated at a communication station upon selected communication channels of a set of communication channels, said communication signal comprising a plurality of bursts, said method comprising the steps of:
- selecting a first antenna from a set of antennas for a first burst;
- determining a first frequency for said first burst;
- transducing said first burst via only said first antenna and at said first frequency;
- receiving information regarding a fading characteristic of a communication channel corresponding to said first antenna and said first frequency;
- selecting a second antenna from said set of antennas for a second burst based, at least in part, on said information regarding said fading characteristic;
- determining a second frequency for said second burst based, at least in part, on said information regarding said fading characteristic;
- and
- wherein a difference between said first and second frequencies approximately exceeds a coherence bandwidth in order to create frequency diversity while transducing said communication signal.
A frequency hopping method for transmitting a communication signal generated at a communication station upon selected communication channels of a set of communication channels, said communication signal comprising a plurality of bursts, said method comprising the steps of:
- selecting a first antenna from a set of antennas for a first burst;
- determining a first frequency for said first burst;
- transducing said first burst via only said first antenna and at said first frequency;
- receiving information regarding a fading characteristic of a communication channel corresponding to said first antenna and said first frequency;
- selecting a second antenna from said set of antennas for a second burst based, at least in part, on said information regarding said fading characteristic;
- determining a second frequency for said second burst based, at least in part, on said information regarding said fading characteristic;
- receiving at least one burst of said plurality of bursts of said communication signal on said communication channel at a remote communication station on a single antenna of said remote communication station;
- determining a signal quality of said at least one burst;
- and
- transmitting said signal quality of said at least one burst from said remote communication station.
A communication station for transmitting a communication signal upon selected communication channels of a set of communication channels, said communication signal comprising a plurality of bursts, comprising:
- means for selecting a first antenna from a set of antennas for a first burst;
- means for determining a first frequency for said first burst;
- means for transducing said first burst via only said first antenna and at said first frequency;
- means for selecting a second antenna from said set of antennas for a second burst based, at least in part, on said first antenna;
- means for determining a second frequency for said second burst based, at least in part, on said first frequency;
- means for transducing said second burst via only said second antenna and at said second frequency;
- and
- wherein said means for selecting a second antenna and said means for determining a second frequency are further operated based, at least in part, on a history of antennas of said set of antennas and a history of frequencies via which and at which, respectively, said communication signal has previously been transduced.
A communication station for transmitting a communication signal upon selected communication channels of a set of communication channels, said communication signal comprising a plurality of bursts, comprising:
- means for selecting a first antenna from a set of antennas for a first burst;
- means for determining a first frequency for said first burst;
- means for transducing said first burst via only said first antenna and at said first frequency;
- means for selecting a second antenna from said set of antennas for a second burst based, at least in part, on said first antenna;
- means for determining a second frequency for said second burst based, at least in part, on said first frequency;
- and
- wherein a difference between said first and second frequencies approximately exceeds a coherence bandwidth in order to create frequency diversity while transducing said communication signal.
Dependencies are inferred from the claim text.