Transmission error protection for tdma digital channels

Details Transmission error protection for tdma digital channels Transmission error protection for tdma digital channels

G - Physics

06

F

363/10

G06F 11/10 (2006.01) H03M 13/00 (2006.01) H04L 1/00 (2006.01)

Patent

CA 1323456

TRANSMISSION ERROR PROTECTION FOR TDMA DIGITAL CHANNELS Abstract of the Disclosure There is provided a method of reducing the effects of transmission errors in a digital cellular mobile radio system in which R-S symbols are transmitted over a radio channel in two bursts, separated in time. This technique provides sufficient R-S error protection to recover the data if one of the bursts is entirely erased due to channel errors. With a TDMA channel format, speech data is sent in bursts over the radio channel. Each transmission bursts contain only half of the R-S symbols for a given R-S code block. The two bursts, comprising a complete R-S block, are separated in time so that a short Raleigh fade in the transmission channel is only likely to affect one of the bursts, allowing the data to be completely recovered from the unaffected burst. In order to provide sufficient error correcting power for this purpose, the R-S algorithm assumes that the number of protection symbols is at least as large as the number of data symbols. Information regarding the likelihood of correctly decoding each of the received radio symbols (e.g. di-bits in the case of 4-phase DPSK transmission) is used to predict those R-S symbols most likely to be in error. Those that are found likely to be in error are marked as erased. This technique improves the recovery rate of the speech information bits. - i -

610910

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