Method and apparatus for detecting pseudo noise pattern for remote loopback test

A method for detecting a PN (Pseudo Noise) pattern for a remote loopback test in a communication system, said method comprising the steps of:

• (a) receiving a first n-bit pattern (n is an arbitrary number) which i a part of said PN pattern;
• (b) generating a second n-bit pattern subsequent to said first n-bit pattern from said first n-bit pattern by a predetermined shift and exclusive-OR operation,
• wherein said second n-bit pattern shows a resultant n-bit pattern which should be received after said first n-bit pattern, and said step (b) is repeatedly carried out each time n bits of said first n-bit pattern are received at step (a);
• (c) determining whether or not said resultant n-bit pattern is identical to said second n-bit pattern;
• and
• (d) generating a pattern detection signal when said resultant signal is identical to said second n-bit pattern for a predetermined number of times to activate by said pattern detection signal a predetermined loopback test procedure in the communication system.

An apparatus for detecting a PN (Pseudo Noise) pattern for a remote loopback test in a communication system, said apparatus comprising:

• first means for receiving a fist n-bit pattern (n is an arbitrary number) which is a part of said PN pattern;
• second means for leftwardly shifting said first n-bit pattern by a first predetermined number of bits, so that a second n-bit pattern is generated;
• third means for executing an exclusive-OR operation on said first n-bit pattern and said second n-bit pattern, so that a third n-bit pattern is generated;
• fourth means for rightwardly shifting said third n-bit pattern by a second predetermined number of bits, so that a fourth n-bit pattern is generated;
• fifth means for executing an exclusive-OR operation on said third n-bit pattern and said fourth n-bit pattern, so that a fifth n-bit pattern is generated,
• wherein said fifth n-bit pattern shows a sixth n-bit pattern which should be received after said first n-bit pattern, and said second through fifth means carry out respective operations each time n bits of said first n-bit pattern are received by said first means;
• sixth means for determining whether or not said fifth n-bit pattern is identical to said sixth n-bit pattern;
• and
• seventh means for generating a pattern detection signal when said fifth n-bit pattern is identical to said sixth n-bit pattern for a predetermined number of times to activate by said pattern detection signal a predetermined loopback test procedure in the communication system.

An apparatus for detecting a PN (Pseudo Noise) pattern for a remote loopback test in a communication system, said apparatus comprising:

• first means for receiving a fist n-bit pattern (n is an arbitrary number) which is a part of said PN pattern;
• and
• (b) second means for generating a second n-bit pattern subsequent to said first n-bit pattern from said first n-bit pattern by a predetermined shift and exclusive-OR operation,
• wherein said second n-bit pattern shows a resultant n-bit pattern which should be received after said first n-bit pattern, and said second means repeatedly carries out its operation each time n bits of said first n-bit pattern are received by said first means;
• (c) third means for determining whether or not said resultant n-bit pattern is identical to said second n-bit pattern;
• and
• (d) fourth means for generating a pattern detection signal when said resultant signal is identical to said second n-bit pattern for a predetermined number of times to activate by said pattern detection signal a predetermined loopback test procedure in the communication system.