Method for digital transmission of messages
First Claim
1. In a method for digital transmission of messages in a digital radio relay system using a superframe for digital signals to permit the transmission of additional bits of data, the improvement comprising the steps of:
- (a) creating a predetermined number m of superframes, wherein each superframe comprises two half-frames, each half-frame appearing in the superframe in equal, consecutive, predetermined time periods and each half frame containing one byte for additional bits of data;
(b) combining the m superframes into a multiple frame; and
(c) scrambling the digital signals, including the additional bits of data, of each superframe by adding a periodic bit pattern to the digital signals wherein the scrambling pattern has a period of the length of the multiple frame, wherein the byte of the first half frame contains at least one parity bit, one service bit and a plurality of frame alignment bits in a predetermined sequence, and the byte of the second half frame contains at least one parity bit, one marking bit, one frame alignment bit, and a plurality of service bits in a predetermined sequence.
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Abstract
The invention involves a method for digital transmission of messages in a digital radio relay system which utilizes a superframe so additional information can be transmitted with a digital signal. This method eliminates the simulation of a frame alignment signal by service bits. In this invention m superframes each consisting of two half-frames containing a byte for additional bits and in which a scrambling of the digital signals takes place by adding a periodic bit pattern to the digital signal, are combined to form a multiple frame. The pattern used for scrambling has a period equal to the length of the multiple frame.
74 Citations
7 Claims
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1. In a method for digital transmission of messages in a digital radio relay system using a superframe for digital signals to permit the transmission of additional bits of data, the improvement comprising the steps of:
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(a) creating a predetermined number m of superframes, wherein each superframe comprises two half-frames, each half-frame appearing in the superframe in equal, consecutive, predetermined time periods and each half frame containing one byte for additional bits of data; (b) combining the m superframes into a multiple frame; and (c) scrambling the digital signals, including the additional bits of data, of each superframe by adding a periodic bit pattern to the digital signals wherein the scrambling pattern has a period of the length of the multiple frame, wherein the byte of the first half frame contains at least one parity bit, one service bit and a plurality of frame alignment bits in a predetermined sequence, and the byte of the second half frame contains at least one parity bit, one marking bit, one frame alignment bit, and a plurality of service bits in a predetermined sequence. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification