Apparatus and method for communication

Details Apparatus and method for communication Apparatus and method for communication

2007-10-30

2007-10-30

Trinh, Sonny (Department: 2618)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C375S267000, C455S101000

Reexamination Certificate

active

10545002

ABSTRACT:
An eigen value expansion section103calculates eigen values and eigen vectors in a correlation matrix or covariance matrix of input signals. When the ratio between a maximum eigen value and other eigen values is equal to or lower than a threshold, an assignment method selection section104selects a code assignment method whereby systematic bits are transmitted with their respective eigen vectors. As a result, a communication apparatus100transmits a systematic bit X with the respective eigen vectors. On the other hand, when the ratio between a maximum eigen value and other eigen values is greater than the threshold, the assignment method selection section104selects a code assignment method whereby systematic bits are transmitted with only the eigen vector having the maximum eigen value. As a result, the communication apparatus100transmits the systematic bit X with only the eigen vector having the maximum eigen value. This makes it possible to obtain an effect of improving sufficient communication quality even when the difference between the maximum eigen value and other eigen values is large in a communication system which combines a turbo code and MIMO.

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