Distributed base station, communication system, and signal transmission method thereof
First Claim
1. A distributed base station serving mobile stations, comprising:
- a plurality of spatially diverse antenna-RF processing units remote from one another, each of the antenna-RF processing units having an antenna array formed by multiple antennas; and
a central processing unit remotely connected with said multiple antenna-RF processing units, each of the antenna RF processing units having an antenna array formed by multiple antennas, said central processing unit comprising;
a MIMO coding unit for MIMO coding of data of each of the mobile stations so that data of each of the mobile stations generates multi-path data symbols;
a baseband beam-forming unit for multiplying each path data symbol of the multipath data symbols of each of the mobile stations by a weighted coefficient vector corresponding to this path data symbol, to obtain beam-forming data of each path data symbol of each of the mobile stations; and
an overlapping unit for, with respect to each antenna in said antenna RF processing units, overlapping beam-forming data of the respective mobile stations for this antenna and feeding the overlapped beam-forming data to this antenna for transmission, wherein the overlapping unit of the baseband beam-forming unit multiplies each path data symbol of each given mobile station by only two weighted coefficient vectors corresponding to two selected antenna-RF processing units selected by the given mobile station to obtain beam-forming data of each path data symbol of each of the mobile stations.
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Abstract
The present invention discloses a distributed base station serving mobile stations, which comprises multiple antenna-RF processing units and a central processing unit remotely connected with said multiple antenna-RF processing units. Each of the antenna-RF processing units has an antenna array formed by multiple antennas. Said central processing unit comprises: an MIMO coding unit for MIMO coding of data of each of the mobile stations so that data of each of the mobile stations generates multi-path data symbols; a beam-forming unit for multiplying each path data symbol of the multi-path data symbols of each of the mobile stations by a weighted coefficient vector corresponding to this path data symbol, to obtain beam-forming data of each path data symbol of each of the mobile stations; and an overlapping unit for, with respect to each antenna in said antenna-RF processing units, overlapping beam-forming data of the respective mobile stations for this antenna and feeding the overlapped beam-forming data to this antenna for transmission. The present invention further discloses a communication system having the above distributed base station and the corresponding signal transmission method.
40 Citations
18 Claims
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1. A distributed base station serving mobile stations, comprising:
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a plurality of spatially diverse antenna-RF processing units remote from one another, each of the antenna-RF processing units having an antenna array formed by multiple antennas; and a central processing unit remotely connected with said multiple antenna-RF processing units, each of the antenna RF processing units having an antenna array formed by multiple antennas, said central processing unit comprising; a MIMO coding unit for MIMO coding of data of each of the mobile stations so that data of each of the mobile stations generates multi-path data symbols; a baseband beam-forming unit for multiplying each path data symbol of the multipath data symbols of each of the mobile stations by a weighted coefficient vector corresponding to this path data symbol, to obtain beam-forming data of each path data symbol of each of the mobile stations; and an overlapping unit for, with respect to each antenna in said antenna RF processing units, overlapping beam-forming data of the respective mobile stations for this antenna and feeding the overlapped beam-forming data to this antenna for transmission, wherein the overlapping unit of the baseband beam-forming unit multiplies each path data symbol of each given mobile station by only two weighted coefficient vectors corresponding to two selected antenna-RF processing units selected by the given mobile station to obtain beam-forming data of each path data symbol of each of the mobile stations. - View Dependent Claims (2, 3, 4, 5, 6, 12, 13, 15, 17, 18)
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7. A method of signal transmission between a distributed base station and mobile stations, wherein said distributed base station comprises multiple antenna-RF processing units remote from one another and a central processing unit remotely connected with said multiple antenna-RF processing units, the method comprising the following steps:
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an MIMO coding step for MIMO coding of data of said base station for each of the mobile stations to divide data of each of the mobile stations into multi-path data symbols; a baseband beam-forming data obtaining step for multiplying each path data symbol of the multipath data symbols of each of the mobile stations by a weighted coefficient vector corresponding to this path data symbol to obtain beam-forming data of each path data symbol of each of the mobile stations, wherein the baseband beam-forming data obtaining step includes multiplying each path data symbol of each given mobile station by only two weighted coefficient vectors corresponding to two selected antenna-RF processing units selected by the given mobile station to obtain beam-forming data of each path data symbol of each of the mobile stations; and an overlapping step for, with respect to each antenna in a plurality of spatially diverse remote antenna-RF processing units, overlapping beam-forming data of the respective mobile stations for this antenna and feeding the overlapped beam-forming data to this antenna for transmission. - View Dependent Claims (8, 9, 10, 11, 14, 16)
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Specification