Importance

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Abstract

A method is disclosed for signal transmission and reception utilizing wideband signals, and, more particularly, the use of time-frequency coded signals to achieve more efficient use of the electromagnetic spectrum. The method can be generally utilized for signal transmission and reception, including personal communication uses such as utilized for land-mobile radio communications. Each user is assigned a unique set of time-frequency coded waveforms for both transmission and reception, and both message and control signals are transmitted and received using the assigned unique set of signals. Message modulation is effected by digitizing the message, such as a speech message, and several types of message digitization, including PCM are set forth. For land-mobile radio service, the geographical area is divided into a series of cells each of which has a base station therein for communication with the mobile units then in the cell. Each mobile unit transmitter utilizes automatic power control to maintain the received signal level at the base station constant regardless of the location of the mobile unit within the cell.

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First Claim