Patent
Method and apparatus for testing a digital communication channel
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TLDR
In this article, a system and method for testing signal transmission quality within a digital communication system is proposed, in which a test sequence of digital data transmitted over the communication channel is received at a receiving station, within which a replica of the test sequence is also generated.Abstract:
A system and method for testing signal transmission quality within a digital communication system is disclosed herein The system may be incorporated within a digital cellular communication system in which information is exchanged over spread spectrum communication channels, among a plurality of mobile users, via at least one cell-site The system contemplates testing a digital communication channel by transmitting a test sequence of digital data over the communication channel The test sequence of digital data transmitted over the communication channel is received at a receiving station, within which is also generated a replica of the test sequence of digital data The accuracy of transmission over the communication channel is then determined by comparing the replica of the test sequence of digital data to the test sequence of data received over the communication channel The system allows the test sequence of digital data to be transmitted at one of a set of known data rates, with the receive station being disposed to identify the data rate associated with each test sequence of digital data In a preferred implementation transmission of the test sequence involves generating a first plurality of data packets, which collectively comprise the test sequence of digital data Each data packet is assigned one of a multiplicity of data rates in accordance with a first pseudorandom process, and is then transmitted at the data rate assigned theretoread more
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References
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Patent
Digital signal quality evaluation circuit using synchronization patterns
TL;DR: In this paper, the bit error rate of received digital signals in terminals of a mobile communication system is measured, where each station receives signals in successive data frames which includes a synchronization pattern and stores a version of the synchronization pattern.
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Method of determining automatically the rate of data signals in a modem
TL;DR: In this paper, a method of determining the data rate of signals received on a communication line is disclosed, which analyzes the training signals which normally precede each data transmission to determine whether they contain a preselected pattern of phase reversals.
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Apparatus and method for determining line rates
TL;DR: In this article, the bit rate of an incoming signal is determined by counting the number of fast reference clock cycles which fit within each pulse of the incoming signal for a statistically significant number of pulses and providing indications thereof to the logic circuit.