Process in coherent mobile radio receiver

Abstract

Abstract In the mobile radio system, the transmission of signals over the different channels (1,2,3) occurs in the form of time slots with data bits. Each time slot contains a first time in interval (to-t1) for a practice sequence (S) contg. synchronisation data, and a second such interval (y1-t2) for a data sequence contg. control and data information. The two sequences are filtered in a smoother for compensating the imperfection of the channel in the spread. The filter coefficients of the smoother are adjusted in accordance with a specific algorithm, and dependent upon the fault arising on comparison of the received practice sequence with a known reference sequence in the receiver. The transmitted practice sequence detected in the receiver, together with the received data sequence (D), is stored for a specific time interval (to-t2) corresp. to the first and second time intervals. During the following time interval (t2-t6) the practice sequence is fed outwards during two consecutive time intervals (t2-t5) before the data sequence to the smoother filter. This enables comparison to be effected at least twice withthe reference sequence.

Inventors

• 👤 B O P Gudmundson

Bibliographic Details