Data transmission method, transmitter, and receiver

Details Data transmission method, transmitter, and receiver Data transmission method, transmitter, and receiver

1995-03-06

2000-01-11

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Distortion, noise, or other interference prevention,...

455 671, H04B 110

Patent

active

060145501

ABSTRACT:
The invention relates to a data transmission method in a cellular communications system comprising in each cell at least one base station communicating with mobile stations within its coverage area, in which method extra known reference information is added to a transmit signal. To enable smooth estimation of a channel, the amount of added reference information per time unit is varied in response to the radio channel parameters. The invention also relates to a transmitter having means for encoding (41), interleaving (41) and modulating (48) the transmit signal. The transmitter of the invention comprises means (42) for combining known reference symbols with the transmit signal and means (45) for controlling the combination. The invention further relates to a receiver having means for demodulating (51) and decoding (61) a received signal and means (51) for deinterleaving the signal. The receiver of the invention comprises means (52, 66) for removing the known reference symbols from the received signal and means (54) for controlling the removal of the reference symbols.

REFERENCES:
patent: 5031193 (1991-07-01), Atkinson et al.
patent: 5212689 (1993-05-01), Eriksson
patent: 5265128 (1993-11-01), Widmer et al.
patent: 5396653 (1995-03-01), Kivari et al.
patent: 5475713 (1995-12-01), Bremer et al.
patent: 5857147 (1999-08-01), Gadner et al.
TIA/EIA Interim Standard, "Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System" Jul. 1993, Telecommunications Industry Association.
IEEE, 1993, "Coherent Detection With Reference-Symbol Based Channel Estimation For Direct Sequence CDMA Uplink Communications" F. Ling Motorola, Inc.
Finnish Office Action and English Translation thereof, Nokia Mobile Phones Ltd., Application No. 941072.

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