Transmission method and receiver

A data reception method, comprising:

• receiving a frame, where the frame comprises a header section, a training sequence section, address and rate section, and a payload section, the payload section consisting of a payload field with one or more packets and a cyclic redundancy check field after each packet,
• obtaining synchronisation to the received frame utilising the training sequence section comprising a given number of first fields of equal length and a second field, where the total length of the given number of the first fields is shorter than or equal to the length of the second field, the second field comprising a given Zadoff-Chu symbol sequence, and the first field comprising a part of the same given Zadoff-Chu symbol sequence, wherein the first fields comprise the last symbols of the Zadoff-Chu sequence of the second field and thereby act as a cyclic prefix to the second field,
• selecting the Zadoff-Chu sequence to be used on a connection from a pool of Zadoff-Chu sequences based on the address and rate section and channel identification of the connection,
• calculating the cyclic redundancy check in a cyclic redundancy check calculator,
• providing a feedback from the cyclic redundancy check calculator to a convolutional decoder, and
• decoding the payload in the convolutional decoder utilising the feedback.

A transmitter, comprising

• at least one processor;
• at least one memory including computer program code;
• the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform:
• forming a frame for transmission, where the frame comprises a header section, a training sequence section, address and rate section, and a payload section,
• forming the training sequence section comprising a given number of first fields of equal length and a second field, where the total length of the given number of the first fields is shorter than or equal to the length of the second field, the second field comprising a given Zadoff-Chu symbol sequence, and the first field comprising a part of the same given Zadoff-Chu symbol sequence, wherein the first fields comprise the last symbols of the Zadoff-Chu sequence of the second field and thereby act as a cyclic prefix to the second field, and
• selecting the Zadoff-Chu sequence to be used on a connection from a pool of Zadoff-Chu sequences based on the address and rate section and channel identification of the connection.

A receiver, comprising

• at least one processor;
• at least one memory including computer program code;
• the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to perform:
• receiving a frame, where the frame comprises a header section, a training sequence section, address and rate section, and a payload section, the payload section consisting of a payload field with one or more packets and a cyclic redundancy check field after each packet,
• obtaining synchronisation to the received frame utilising the training sequence section comprising a given number of first fields of equal length and a second field, where the total length of the given number of the first fields is shorter than or equal to the length of the second field, the second field comprising a given Zadoff-Chu symbol sequence, and the first field comprising a part of the same given Zadoff-Chu symbol sequence, wherein the first fields comprise the last symbols of the Zadoff-Chu sequence of the second field and thereby act as a cyclic prefix to the second field,
• selecting the Zadoff-Chu sequence to be used on a connection from a pool of Zadoff-Chu sequences based on the address and rate section and channel identification of the connection,
• calculating the cyclic redundancy check in a cyclic redundancy check calculator,
• providing a feedback from the cyclic redundancy check calculator to a convolutional decoder, and
• decoding the payload in the convolutional decoder utilising the feedback.