Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Patent
1997-03-11
1998-08-25
Safourek, Benedict V.
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
370465, 370347, 375200, 375206, H04N 7167
Patent
active
057990131
ABSTRACT:
A method and device are disclosed that utilize a spread spectrum coding process for processing a signal having first and second time portions to achieve unequal error protection of the time portions by variably modulating the power of one segment relative to the second segment. In such a signal, the first segment contains information that is more significant, i.e., more sensitive to error, than the second segment and the power modulator increases the average power of the signal during the first time portion relative to the average power of the signal during the second time portion. Preferably, the power increase of the first time portion is proportional to the power decrease of the second time portion so as to maintain overall system power requirements. The method and device are particularly suited for a digital cellular telephone systems such as DS-CDMA. In such a system, the signal is spread by a single spreading sequence. Also disclosed is a decoding device and method for decoding the signal processed by the above coder utilizing a first decoder to decode the first time portion and a second decoder to decode the second time portion.
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Seshadri Nambirajan
Sundberg Carl-Erik Wilhelm
Lucent Technologies - Inc.
Rao Seema S.
Safourek Benedict V.
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