Digital channel selection

Details Digital channel selection Digital channel selection

1997-12-29

2001-06-05

Marcelo, Melvin (Department: 2663)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S344000

Reexamination Certificate

active

06243368

ABSTRACT:

FIELD OF THE INVENTION
This invention relates generally to communications, and more particularly to digital communications.
BACKGROUND OF THE INVENTION
Wireless communication provides tetherless access to mobile users and addresses the requirements of two specific and disjoint domains: voice telephony and indoor data LANs. Cellular telephone networks have extended the domain of telephone service over a wireless last hop, while mobile-IP LANs such as WaveLAN and RangeLAN do the same for indoor users of TCP/IP data networks. Advances with wireless technology and high-speed integrated service wired networking promises to provide mobile users with comprehensive multimedia information access in the near future. For example, Personal Communication Services (PCS) are a broad range of individualized telecommunication services which enable individuals or devices to communicate irrespective of where they are at anytime. Personal Communication Networks (PCN) are a new type of wireless telephone system communicating via low-power antennas. PCNs offer a digital wireless alternative to the traditional wired line.
When transmitting a message signal over a communication channel, both analog and digital transmission methods can be used. Digital methods are preferred due to advantages over analog methods, including: increased immunity to channel noise and interference; flexible operation of the system; common format for the transmission of different kinds of message signals; improved security of communications through the use of digital encryption; and increased capacity.
Cellular and PCS technologies have evolved to utilize digital signals in order to provide higher capacity and improve communication quality. This signal is a composite digital signal which represents a block of adjacent channels. In selecting a channel, the use of multipliers are not desirable, as they are computationaly expensive. Efficient digital channel selection is desirable.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided a method for selecting a digital channel from a composite digital signal comprised of a plurality of digital channels. The method comprises the steps of: assigning two frequency bands of a plurality of frequency bands to each of the plurality of digital channels, in which the two frequency bands overlap such that the digital channel is approximately centered in one of the two frequency bands and is near an edge of another of said two frequency bands; selecting a filter from a group of filters, the selected filter corresponding to the one of two frequency bands, wherein the digital channel is approximately centered; and applying the selected filter to the composite digital signal. An apparatus implementing the method is also described.


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