Range extension within a communication system

Details Range extension within a communication system Range extension within a communication system

1999-03-02

2001-01-02

Hunter, Daniel S. (Department: 2749)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

48, C375S213000, C370S342000

Utility Patent

active

06169887

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to communication systems and, in particular, to extending the range of a base site in a cellular communication system.
BACKGROUND OF THE INVENTION
In current Code Division, Multiple Access (CDMA) communication systems, receivers (channel elements) restrict a search and demodulation window to 512 chips. More particularly, a remote unit accessing a CDMA communication system can have a round-trip delay of no more than 416 micro seconds (512 chips), or equivalently, a maximum distance of 62 kilometers (km) from the base station. Remote units with a larger delay than 512 chips will not be within a base station's search window, and will not be acquired by the base station.
Although the above restriction on round-trip delay is adequate for most urban areas, there exists locations where a maximum cell size of greater than 62 km is desired. For example, along coastal areas, or within very sparsely populated locations, it may be economically unfeasible to have small cell sizes. Therefore a need exists for a base station that has an extended cell size. Additionally, it would be beneficial if existing CDMA equipment can be inexpensively modified to provide such coverage.


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