Digital radio receivers

A digital radio receiver arranged to:

• a) receive an incoming radio signal comprising an incoming symbol sequence;
• b) select a portion of the incoming symbol sequence;
• c) determine a first error between the selected portion of the incoming symbol sequence and a first predetermined symbol sequence using a difference metric;
• d) determine using the difference metric a set of second errors between the selected portion of the incoming symbol sequence and a respective set of second predetermined symbol sequences, each formed by prepending different length portions of a predetermined preamble symbol sequence to a beginning of the first predetermined symbol sequence;
• and
• e) determine a minimum error from the first error and the set of second errors;
• wherein, if the first error is not the minimum error, the radio receiver is arranged to select a different portion of the incoming symbol sequence and repeating steps c) to e);
• and
• if the first error is the minimum error, the radio receiver is arranged to decode a following portion of the incoming symbol sequence to produce a data payload.

A digital radio receiver arranged to:

• a) receive an incoming radio signal comprising an incoming symbol sequence;
• b) select a portion of the incoming symbol sequence;
• c) determine a first error between the selected portion of the incoming symbol sequence and a first predetermined symbol sequence;
• d) determine a most-likely coded address corresponding to the selected portion of the incoming symbol sequence;
• e) determine a fit error between the selected portion of the incoming symbol sequence and the most-likely coded address;
• e) determine an offset between the first error and the fit error and compare said offset to an offset threshold;
• if the offset is greater than the offset threshold, select a different portion of the incoming symbol sequence and repeat steps c) to e);
• and
• if the offset is less than or equal to the offset threshold, decode a following portion of the incoming symbol sequence to produce a data payload.