Method for modifying a bit sequence in an ARQ retransmission, receiver and transmitter therefor
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsAlexander Golitschek Edler Von Elbwart, Eiko Seidel, Christian Wengerter
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Abstract
An ARQ transmission method in a communication system, wherein data packets comprising modulation symbols are transmitted based on an automatic repeat request and subsequently combined with previously received data packets. The symbols of the transmitted data packets are modulated in a mapping entity employing at least a first and second signal constellation. The method further comprises the step of obtaining the second signal constellation from the first signal constellation by exchanging a logical bit position and/or inverting a logical bit. The invention further relates to a corresponding transmitter and receiver.
Claims14
An ARQ transmission method in a communication system, wherein data packets comprising modulation symbols are transmitted based on an automatic repeat request and subsequently combined with previously received data packets, comprising the steps of:
- modulating the symbols of the transmitted data packets in a mapping entity employing at least a first and second signal constellation;
- and
- obtaining the second signal constellation from the first signal constellation by exchanging bit positions and/or inverting a logical bit value.
The transmission method according to one of claims, wherein a pattern which determines the interleaving and inverting process is stored at the receiver and the transmitter of the communication system.
A transmitter of an ARQ communication system for transmitting data packets consisting of modulation symbols, employing at least a first and second signal constellation, comprising:
- a mapping entity for modulating data bits onto symbols employing a predetermined signal constellation;
- a logical bit inverter for inverting data bits prior to supplying same to the mapping entity, and/or
- an interleaver for exchanging the positions of data bits within a symbol prior to supplying same to the mapping entity.
A receiver of an ARQ communication system for receiving data packets consisting of modulation symbols modulated with at least a first and second signal constellation comprising:
- a demapping entity for demodulating the received symbols modulated with a predetermined signal constellation;
- a logical bit inverter for inverting data bits output from the demapping entity;
- and
- a de-interleaver for exchanging the positions of data bits within a symbol after outputting same from the mapping entity.
Dependencies are inferred from the claim text.