Antenna Diversity Arrangement and Method
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Abstract
The invention relates to an antenna diversity arrangement and a radio base station in a frequency divided mobile cellular system with sectorized cells. Space diversity or polarization diversity is provided by providing at least two branches. In accordance with the invention an operator frequency band is divided into a plurality of bands for transmitting and receiving. All sectors are branch wise combined in a respective tower mounted amplifier. TX signals within the TX bands belonging to a TMA are diplexed and simultaneously transmitted on the sectors. RF signals received on one branch of a sector are combined with RF signals received on the corresponding sector in the other branches. The RX signals so combined are fed to the radio base station on a single feeder together with the TX signals fed in the opposite direction from transceivers of the base station to the same TMA. A sector may be assigned two or more TX frequencies. Frequency hopping within each TX band may optionally be provided (synth hopping). If two or more TX frequencies are assigned to a sector synth hopping may be combined with frequency hopping between the TX bands assigned to the sector in the A branch as well as the TX bands assigned to the corresponding sector in the B branch.
22 Citations
36 Claims
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1-18. -18. (canceled)
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19. A method for reducing the number of feeders between a radio base station and a diversity antenna system at a base station site of a frequency divided mobile cellular system with sectorized cells, the diversity antenna system comprising combinations of antennas for transmitting and receiving in a respective cell sector, each such antenna combination comprising at least two branches for providing diversity, an operator of said cellular system being assigned a predefined operator frequency band which in its turn is divided into a plurality of bands, each for transmitting and receiving, the method comprising the step of assigning each sector one RX band and one TX band, and the further steps of
further possibility to divide the assigned TX bands into one or more sub bands so as to provide two or more diversity branches, branch-wise diplexing the TX bands assigned to the sectors of a branch so that in each sector of a branch signals are transmitted on the TX band assigned to this sector, sector-wise combining signals received in a sector'"'"'s own assigned RX band with signals received in the other sectors at the same branch, transmitting the diplexed TX signals and receiving the combined RX signals in all sectors of a branch on a single feeder.
- 27. An antenna diversity arrangement at a radio base station of a frequency divided mobile cellular system with sectorized cells, the diversity antenna arrangement comprising combinations of antennas for transmitting and receiving in a respective cell sector, each such antenna combination comprising at least two branches for providing diversity, an operator of said cellular system being assigned a predefined operator frequency band which in its turn is divided into a plurality of bands for transmitting and receiving, each sector being assigned one RX band and one TX band, the antenna diversity arrangement further comprising in each branch TX and RX filters and low noise amplifiers, a tower mounted amplifier provided for each branch, the tower mounted amplifier for an individual branch comprising for each one of the sectors TX- and RX-filters, a tower mounted amplifier of a branch comprising a splitter for splitting the respective TX bands assigned to the sectors of said branch, and a combiner for combining the signals received in a sector'"'"'s own assigned RX band with signals received in the other sectors at the same branch, and a single feeder connected to a respective tower mounted amplifier for transmission of all TX and RX signals of the branch to which the tower mounted amplifier belongs.
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34. A radio base station at a base station site of a frequency divided mobile cellular system with sectorized cells, the radio base station adapted for use with a diversity antenna system comprising combinations of antennas for transmitting and receiving in a respective cell sector, each such antenna combination comprising at least two branches for providing diversity, an operator of said cellular system being assigned a predefined operator frequency band which in its turn is divided into a plurality of bands, each for transmitting and receiving, feeders extending between the diversity antenna system and the radio base station, each sector being assigned one TX band and one RX band, wherein a tower mounted amplifier is provided for each branch, the tower mounted amplifier for an individual branch comprising for each one of the sectors TX filters and RX filters, a tower mounted amplifier of a branch comprising a splitter for splitting the respective TX bands assigned to the sectors of said branch, and a combiner for combining the signals received in a sector'"'"'s own assigned RX band with signals received in the other sectors at the same branch, and a single feeder connected to a respective tower mounted amplifier for transmission of all TX and RX signals of the branch to which the tower mounted amplifier belongs, a radio base station filter unit provided in each branch, the RBS filter units being connected to respective feeders as well as to transceivers provided in the radio base station, an RBS filter unit of a branch comprising a band pass RX filter passing at least the operator'"'"'s frequency band and individual TX filters, each TX filter being associated with a respective sector of the branch to which the RBS filter unit belongs.
Specification