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US 8,428,653 B2Granted
Hot-spot wireless access exploiting shadowing diversity of distributed antennas
AssigneeMitsubishi Electric Research Laboratories, Inc.
InventorsYe Li, Jinyun Zhang
Life of this patent
Estimating the term…
Abstract
The embodiments of the invention describe method and system for maximizing capacity of a distributed antenna system. A relaying antenna is selected to maximize a signal-to-leakage ratio (SLR) ratio of the distributed antenna system. Further, the capacity of the system is improved by allocating a signal power based on a pseudo-capacity criterion such that an average pseudo capacity of the distributed antenna system is maximized.
Claims8
A method for maximizing capacity of a distributed antenna system, comprising:
- selecting a relaying antenna from a set of antennas of a distributed antenna system to relay a signal to a mobile device;
- allocating a signal power based on a pseudo-capacity criterion such that an average pseudo capacity of the distributed antenna system is maximized;
- and
- relaying the signal from the relaying antenna to the mobile device with the allocated signal power, wherein the average pseudo capacity Cpc is
- C
- pc
- =
- 1
- T
-
- ∑
- k
- =
- 1
- T
-
- log
- 2
- (
- 1
- +
- β
- m
- k
-
- k
-
- p
- k
- ∑
- i
- ≠
- k
-
- β
- m
- i
-
- k
-
- p
- i
- +
- σ
- N
- 2
- )
- ,
- where T is total number of mobile devices using same frequency in the distributed antenna system:
- σ2N is an average power of the AWGN:
- mk is an index of the antenna m in the set of antennas used by the mobile device k;
- βmk is the power gain between the antenna m and the mobile device k;
- pk is a signal power at the antenna mk to relay signal to the mobile device k.
50 more elements
Dependencies are inferred from the claim text.