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AssigneeKoninklijke Philips Electronics N.V.
InventorsConstant P.M.J. Baggen, Arie G.C. Koppelaar, Ewa B. Hekstra
Estimating the term…
In a transmission system with a transmitter (4) coupled to a receiver (6) a main signal (SPEECH INPUT) encoded according to a coding property is transmitted together with an auxiliary signal (AUX). In order to transmit the auxiliary signal without needing additional space in the transmission frame, it is proposed to transmit the auxiliary signal by changing the coding property according to a predetermined sequence. This is done by means of the sequencer (13). In the receiver (6) the decoding of the predetermined sequence is performed by a decoder (31).
Transmission system comprising a transmitter for transmitting a main signal and an auxiliary signal via a transmission channel to a receiver, said transmitter being arranged for receiving the main signal and the auxiliary signal, characterized in that the transmitter comprises an encoder for encoding the main signal in a way described by a coding property, in that the receiver comprises a decoder for decoding the main signal in a way described by the coding property, in that the transmitter comprises coding property sequencing means for changing the coding property according to a predetermined sequence dependent on the auxiliary signal, and in that the receiver comprises a sequence detector for detecting said predetermined sequence in the coding property.
Transmitter being arranged for transmitting a main signal and an auxiliary signal characterized in that the transmitter comprises an encoder for encoding the main signal in a way described by a coding property, and in that the transmitter comprises coding property sequencing means for changing the coding property according to a predetermined sequence dependent on the auxiliary signal.
Receiver being arranged for receiving a main signal and an auxiliary signal, characterized in that the receiver comprises a decoder for decoding the main signal in a way described by a coding property, and in that the receiver comprises sequence detection means for detecting predetermined sequences in the coding property for receiving the auxiliary signal.
Method for transmitting a main signal and an auxiliary signal to a receiver, which is arranged for receiving the main signal and the auxiliary signal, characterized in that the method comprises encoding the main signal in a way described by a coding property, in that the method comprises decoding the main signal in a way described by the coding property, in that the method comprises changing the coding property according to a predetermined sequence dependent on the auxiliary signal, and in that the method comprises detecting said predetermined sequence in the coding property.
Method for transmitting a main signal and an auxiliary signal characterized in that the method comprises encoding the main signal in a way described by a coding property, and in that the method comprises changing the coding property according to a predetermined sequence dependent on the auxiliary signal.
Method for receiving a main signal and an auxiliary signal, characterized in that the method comprises decoding the main signal in a way described by a coding property, and in that the method comprises detecting predetermined sequences in the coding property for receiving the auxiliary signal.
Signal comprising a main signal component and an auxiliary signal component, characterised in that the main signal component is encoded according to a coding property, and in the coding property changes according to predetermined sequences in order to carry the auxiliary component.
Dependencies are inferred from the claim text.
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Systems characterized by the type of code used: unequal error protection
Unequal or adaptive error protection, e.g. by providing a different level of protection according to significance of source information or by…:…
Error control coding in combination with rate matching: by puncturing
Systems modifying transmission characteristics according to link quality, e.g. power backoff: by adapting the channel coding
Term end not estimated
The present invention relates to a transmission system comprising a transmitter coupled via a transmission channel to a receiver, said transmitter being arranged for transmitting a main signal and an auxiliary signal to a receiver, which is arranged for receiving the main signal and the auxiliary signal.
The present invention also relates to a transmitter and a receiver for use in such a transmission system. The invention further relates to a transmission method, and a signal.
In transmission systems it is often desired to transmit in addition to a main signal an auxiliary signal. The main signal can e.g. be a speech signal to be transmitted via a radio link of a mobile telephone system. The auxiliary signal can be e.g. a control signal for requesting a reconfiguration of a the receiver to adapt it to a change of the signal it should receive.
The present invention will now be explained with reference to the drawing figures.
FIG. 1 shows a transmission system according to the invention.
FIG. 2 shows a frame structure use in the transmission system according to FIG. 1.
The transmission system according to FIG. 1, comprises three important elements being the TRAU (Transcoder and Rate Adapter Unit) 2, the BTS (Base Transceiver Station) 4 and the Mobile Station 6. The TRAU 2 is coupled to the BTS 4 via the A-bis interface 8. The BTS 4 is coupled to the Mobile Unit 6 via an Air Interface 10.
A main signal being here a speech signal to be transmitted to the Mobile Unit 6, is applied to a speech encoder 12. A first output of the speech encoder 12 carrying an encoded speech signal, also referred to as source symbols, is coupled to a channel encoder 14 via the A-bis interface 8. A second output of the speech encoder 12, carrying a background noise level indicator BD is coupled to an input of a system controller 16. A first output of the system controller 16 carrying a coding property, being here a downlink rate assignment signal RD is coupled to the speech encoder 12 and, via the A-bis interface, to coding property setting means 15 in the channel encoder 14 and to a further channel encoder being here a block coder 18. A second output of the system controller 16 carrying an uplink rate assignment signal RU is coupled to a second input of the channel encoder 14. The two-bit rate assignment signal RU is transmitted bit by bit over two subsequent frames. The rate assignment signals RD and RU constitute a request to operate the downlink and the uplink transmission system on a coding property represented by RD and RU respectively.
It is observed that the value of RD transmitted to the mobile station 6 can be overruled by the coding property sequencing means 13 which can force a predetermined sequence of coding properties, as represented by the rate assignment signal RU, onto the block encoder 18 the channel encoder 14 and the speech encoder 13. This predetermined sequence can be used for conveying additional information to the mobile station 6, without needing additional space in the transmission frame. It is possible that more than one predetermined sequence of coding properties is used. Each of the predetermined sequences of coding properties corresponds to a different auxiliary signal value.