Title :
CRC-based techniques for combined burst synchronization and error detection in TDMA PCS systems
Author :
Hammons, A. Roger, Jr.
Author_Institution :
Hughes Network Syst. Inc., Germantown, MD, USA
Abstract :
The TDMA architecture of the PACS system for personal communications services (PCS) is novel in that, while the downlink includes a synchronization field (SYC) to aid timing acquisition, the uplink does not. Instead, PACS uses coset coding at the transmitter to aid uplink synchronization. Bellcore has recommended a two-step CRC-based algorithm for joint burst synchronization and slot error detection. In this paper, we study an alternate method in which successive error-detection syndromes are serially computed using a slight modification of the customary polynomial-division shift register. Effectively eliminating one of the two steps in the Bellcore algorithm, this method produces a hardware implementation of lower complexity and less processing delay. Furthermore, unlike the Bellcore method, it is compatible with the use of shortened cyclic codes
Keywords :
computational complexity; cyclic codes; error detection; personal communication networks; shift registers; synchronisation; time division multiple access; Bellcore algorithm; CRC-based techniques; PACS system; TDMA PCS systems; burst synchronization; complexity; coset coding; cyclic redundancy check; downlink; error detection; hardware implementation; personal communications services; polynomial-division shift register; processing delay; shortened cyclic codes; slot error detection; synchronization field; timing acquisition; two-step CRC-based algorithm; uplink; Delay effects; Downlink; Hardware; Personal communication networks; Picture archiving and communication systems; Polynomials; Shift registers; Time division multiple access; Timing; Transmitters;
Conference_Titel :
Vehicular Technology Conference, 1996. Mobile Technology for the Human Race., IEEE 46th
Print_ISBN :
0-7803-3157-5
DOI :
10.1109/VETEC.1996.503492
