US 6,556,618 B1Granted

Transmitter, receiver and method in a telecommunication system for generating PN sequences for a plurality of user channels

AssigneeTelefonaktiebolaget LM Ericsson

InventorsGerd Mörsberger, Gian Huaman-Bollo, Helmut Leuschner

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Abstract

In a telecommunication system where a plurality of user channels are processed in a time-slotted manner, a transmitter and receiver can perform bit error rate measurements for a plurality of user channels by only using one PN-generator (T-PN) and one state memory (ISM). Whenever the beginning of a new time-slot is detected, a last-stored phase state is read out from the state memory (ISM). When detecting the end of the respective time-slot, the phase state then present in the PN-generator (T-PN) is stored into the state memory (ISM) to be used for re-initialization of the PN-generator (T-PN) for the same time-slot in a succeeding frame. Thus, one PN-generator (T-PN) is enough for generating PN-sequences for a great number of user channels.

Claims41

Dependent claims

A transmitter (TX) of a telecommunication system (TELE) in which a plurality of user channels (US1, US2) are processed using a time-slot multiplexing of user data (US1, US2) in respective transmission frames (FR), comprising:

(a) one single transmitter PN generator (T-PN) including a number (N) of shift registers (SH1-SHN) for generating PN sequences of a predetermined number of bits (2n−1), wherein said predetermined number of bits (2n−1) is larger than the number of bits which can be transmitted for each user channel in a respective time slot;
(b) a PN generator phase state memory (ISM) for storing phase states (PST) of said PN generator (T-PN) for each user channel, a phase state being defined as a bit sequence respectively stored in said shift registers of said PN generator;
(c) a timing means (TM) for detecting a start timing and an end timing of each time slot of each user channel;
(d1) a read/write means (R/W) for writing phase states read out from said memory into said PN generator (T-PN) and for writing phase states read out from said PN generator (T-PN) to said memory;
and
(d2) said read/write means (R/W)
reading out a phase state for a particular user channel from said memory and writing the read out phase state into said PN generator, when said timing means detects a start timing of a time slot in said frames assigned to said particular user channel;
and
reading out the phase state of said PN generator (T-PN) and writing the read out phase state into said memory, when said timing means detects the end of the time slot belonging to said particular user channel.

6 more elements

A receiver (RX) of a telecommunication system (TELE) in which a plurality of user channels (US1, US2) are processed using a time-slot multiplexing of user data (US1, US2) in respective transmission frames (FR), comprising:

a) one single receiver PN generator (R-PN) including a number (N) of shift registers (SH1-SHN) for generating PN sequences of a predetermined number of bits (2n−1), wherein said predetermined number of bits (2n−1) is larger than the number of bits which can be transmitted for each user channel in a respective time slot;
b) a PN generator phase state memory (ISM) for storing phase states (PST) of said PN generator (R-PN) for each user channel, a phase state being defined as a N bit sequence respectively stored in said shift registers of said PN generator;
c) a timing means (TM) for detecting a start timing and an end timing of each time slot of each user channel;
d1) a read/write means (R/W) for writing phase states read out from said memory into said PN generator and for writing phase states read out from said PN generator (R-PN) to said memory;
and
d2) said read/write means (R/W)
reading out a phase state for a particular user channel from said memory and writing the read out phase state into said PN generator (R-PN), when said timing means detects a start timing of a time slot in said frames assigned to said particular user channel;
and
reading out a phase state for a particular user channel from said memory and writing the read out phase state into said PN generator (R-PN), when said timing means detects a start timing of a time slot in said frames assigned to said particular user channel;
and
reading out the phase state of said PN generator (R-PN) and writing the read out phase state into said memory, when said timing means detects the end of the time slot belonging to said particular user channel.

8 more elements

A telecommunication system (TELE) in which a plurality of user channels (US1, US2) are processed using a time-slot multiplexing of user data (US1, US2) in respective transmission frames (FR), comprising:

at least one transmitter (TX), comprising:
a) one single transmitter PN generator (T-PN) including a number (N) of shift registers (SH1-SHN) for generating PN sequences of a predetermined number of bits (2n−1), wherein said predetermined number of bits is larger than the number of bits which can be transmitted for each user channel in a respective time slot;
b) a transmitter PN generator phase state memory (ISM) for storing phase states (PST) of said transmitter PN generator (T-PN) for each user channel, a phase state being defined as a bit sequence respectively stored in said shift registers of said transmitter PN generator (T-PN);
c) a transmitter timing means (TM) for detecting a start timing and an end timing of each time slot of each user channel;
d) a transmitter read/write means (R/W) for writing phase states read out from said transmitter memory into said transmitter PN generator and for writing phase states read out from said transmitter PN generator (T-PN) to said transmitter memory;
and
d2) said transmitter read/write means (R/W)
reading out a phase state of a particular user channel from said transmitter memory and writing the read out phase state into said transmitter PN generator (T-PN), when said transmitter timing means detects a start timing time slot in said frames assigned to said particular user channel;
and
reading out the phase state of said transmitter PN generator (T-PN) and writing said read out phase state into said transmitter memory, when said transmitter timing means detects the end of the time slot belonging to said particular user channel;
and
at least one receiver (RX), comprising:
a) one single receiver PN generator (R-PN) including a number (N) of shift registers (SH1-SHN) for generating PN sequences of a predetermined number of bits (2N−1), wherein said predetermined number of bits (2N−1) is larger than the number of bits which can be transmitted for each user channel in a respective time slot;
b) a receiver PN generator phase state memory (ISM) for storing phase states (PST) of said receiver PN generator (R-PN) for each user channel, a phase state being defined as a N bit sequence respectively stored in said shift registers of said receiver PN generator (R-PN);
c) a receiver timing means (TM) for detecting a start timing and an end timing of each time slot of each user channel;
d1) a receiver read/writer means (R/W) for writing phase states read out from said receiver memory into said receiver PN generator (R-PN) and for writing phase states read out from said receiver PN generator (R-PN) to said receiver memory;
and
d2) said receiver read/write means (R/W)
reading out a phase state of a particular user channel from said receiver memory and writing the read out phase state into said receiver PN generator (R-PN), when said receiver timing means detects a start timing a time slot in said frames assigned to said particular user channel;
and
reading out the phase state of said receiver PN generator (R-PN) and writing the read out phase state into said receiver mernory, when said receiver timing means detects the end of the time slot belonging to said particular user channel.

18 more elements

A method for generating PN sequences of a predetermined number (2N−1) of bits for a plurality of user channels in a telecommunication system, in which said plurality of user channels (US1, US2) are processed using a time-slot multiplexing of user data (US1, US2) in respective transmission frames (FR), by means of a single transmitter PN generator (T-PN) or a single receiver PN generator (R-PN) including a number (N) shift registers (SH1-SHN), wherein said predetermined number of bits of said PN sequence is larger than the number of bits of said PN sequence which can be transmitted for each user channel in a respective time slot, comprising the following steps:

a) loading (ST1) said single transmitter PN generator (T-PN) or said single receiver PN generator (R-PN) with user channel specific phase state (PST) stored in a PN generator phase state memory (ISM) when a start timing of the time slot assigned to the specific user channel in the frame is detected, said phase state being defined as N bit sequence;
b) building (ST2) the PN sequence for the specific user channel during the specific time slot;
and
c) writing (ST3) the phase state (PST) obtained in said single transmitter PN generator (T-PN) or said single receiver PN generator (R-PN) at the end of said specific time slot into said PN generator phase state memory (ISM) as a new user channel specific phase state (PST);
wherein
d) the sequence of steps a), b), c) is repeated (ST4) for each specific user channel in its specific time slot.

3 more elements

Dependencies are inferred from the claim text.