Synchronisation and estimation of a transmission channel

An arrangement for estimating a transmission channel in a digital communications system including a receiver for receiving signal bursts of a communications signal via the transmission channel, the receiver comprising a channel estimation-based equalizer having an equalizer window, the arrangement comprising:

• means for receiving a signal burst of the communications signal over the transmission channel, the signal burst including a sequence of training symbols;
• means for determining a desired synchronization position (p) of the sequence of training symbols with respect to the received signal burst;
• wherein the means for determining a desired synchronization position is adapted to:
• determine a number of estimates of the transmission channel as a function of the synchronization position and a size of the equalizer window (m);
• and
• determine a desired synchronization position and a desired size of the equalizer window by calculating an error measure (ε) based on the received signal burst and the determined estimates for a number of selected values of the synchronization position and of the size of the equalizer window, where the values of the size of the equalizer window are selected between predetermined upper (mu) and lower (ml) bounds.

A receiver for receiving signal bursts of a communications signal via a transmission channel in a digital communications system, the receiver comprising a channel estimation-based equalizer having an equalizer window and an arrangement for estimating the transmission channel, the arrangement comprising:

• means for receiving a signal burst of the communications signal over the transmission channel, the signal burst including a sequence of training symbols;
• means for determining a desired synchronization position (p) of the sequence of training symbols with respect to the received signal burst;
• wherein the means for determining a desired synchronization position is adapted to:
• determine a number of estimates of the transmission channel as a function of the synchronization position and a size of the equalizer window (m);
• and
• determine a desired synchronization position and a desired size of the equalizer window by calculating an error measure (ε) based on the received signal burst and the determined estimates for a number of selected values of the synchronization position and of the size of the equalizer window, where the values of the size of the equalizer window are selected between predetermined upper (mu) and lower (ml) bounds.

A method of estimating a transmission channel in a digital communications system including a receiver for receiving signal bursts of a communications signal via the transmission channel, the receiver comprising a channel estimation-based equalizer having an equalizer window, the method comprising:

• receiving a signal burst of the communications signal over the transmission channel, the signal burst including a sequence of training symbols;
• determining a desired synchronization position of the sequence of training symbols with respect to the received signal burst from a number of estimates (h) of the transmission channel corresponding to a number of selected values of the synchronization position (p);
• and
• wherein the step of determining a desired synchronization position further comprises determining an upper (pu) and a lower (pl) bound for the synchronization position based on at least a desired synchronization position determined for a previously received signal burst;
• and selecting the number of selected values of the synchronization position between the determined upper and lower bounds for the synchronization position.

An arrangement for estimating a transmission channel in a digital communications system including a receiver for receiving signal bursts of a communications signal via the transmission channel, the receiver comprising a channel estimation-based equalizer having an equalizer window, the arrangement comprising:

• means for receiving a signal burst of the communications signal over the transmission channel, the signal burst including a sequence of training symbols;
• means for determining a desired synchronization position of the sequence of training symbols with respect to the received signal burst from a number of estimates (h) of the transmission channel corresponding to a number of selected values of the synchronization position (p);
• means for determining an upper and a lower bound for the synchronization position based on at least a desired synchronization position determined for a previously received signal burst;
• and
• wherein the means for determining a desired synchronization position is further adapted to select the number of selected values of the synchronization position between the determined upper and lower bounds for the synchronization position.

A receiver for receiving signal bursts of a communications signal via a transmission channel in a digital communications system, the receiver comprising a channel estimation-based equalizer having an equalizer window and an arrangement for estimating the transmission channel, the arrangement comprising:

• means for receiving a signal burst of the communications signal over the transmission channel, the signal burst including a sequence of training symbols;
• means for determining a desired synchronization position of the sequence of training symbols with respect to the received signal burst from a number of estimates (h) of the transmission channel corresponding to a number of selected values of the synchronization position (p);
• means for determining an upper and a lower bound for the synchronization position based on at least a desired synchronization position determined for a previously received signal burst;
• and
• wherein the means for determining a desired synchronization position is further adapted to select the number of selected values of the synchronization position between the determined upper and lower bounds for the synchronization position.