Abstract
A radio system is so designed as to allow each of a pair of transceivers to assess the quality of the link, and to modify the signal constellation accordingly. Each transceiver monitors the quality of the channel by assessing the strength of the received signal, or the bit error rate, or both. The system is specifically adapted to time division duplex (TDD) transmission over fast fading channel. In each block of data, the first bit is a QPSK (4QAM) signal, which indicates which constellation is to be used.
Technologies
Mobility and handover
Product
User Equipment (UE/Terminal)
Use Cases
Wireless communication
Services
Maps and Location based Services
Claim
1. A radio system comprising a pair of stations at least one of which has a radio transceiver having;a radio receiver for receiving signals from the other station; means for assessing a quality of the received radio signals; means for selecting a transmission modulation state on the basis of the assessment of the quality of the received signals; a radio transmitter for transmitting signals to the other station using a modulation scheme having a plurality of modulation states; means for adjusting the transmitting state of the radio transmitter to be the selected modulation state; and signalling means for including in the signals to be transmitted to the other station an indication of the selected modulation state.', 'a radio receiver for receiving signals from the other station;', 'means for assessing a quality of the received radio signals;', 'means for selecting a transmission modulation state on the basis of the assessment of the quality of the received signals;', 'a radio transmitter for transmitting signals to the other station using a modulation scheme having a plurality of modulation states;', 'means for adjusting the transmitting state of the radio transmitter to be the selected modulation state; and', 'signalling means for including in the signals to be transmitted to the other station an indication of the selected modulation state.
2. A radio system as claimed in claim 1 wherein the signalling means has means for adjusting the modulation state of the radio transmitter to transmit the indication of the selected modulation state in a predetermined one of the modulation states.
3. A radio system as claimed in claim 1 wherein the radio system operates using time division duplex operation.
4. A radio system as claimed in claim 1, wherein the modulation scheme of the transmitter is quadrature amplitude modulation.
5. A radio system as claimed in claim 1 wherein the means for assessing the quality of the received radio signals assess either or both the received signal strength or bit error rate of those signals.
6. A radio system as claimed in claim 1 wherein each station has a said radio transceiver.
7. A radio transceiver for the transmission and reception of digital signals wherein a transmitter of the transceiver varies the number of binary digits encoded onto each symbol for transmission in accordance with measured received signal strength, the measured bit error rate (BER) or some combination of these which are received by a receiver of said transceiver.
8. A radio transceiver comprising a transmitter and a receiver wherein the signal strength received by said receiver is averaged over a predetermined time period and the number of bits/symbol to be used in subsequent transmissions by said transmitter is determined according to this average.
9. A radio transceiver comprising a transmitter and a receiver wherein errors in decoded digital signals received by said receiver are identified using an error detection system, and the number of bits/symbol to be used in subsequent transmissions by said transmitter is based on the number and distribution of the errors detected
10. A radio system according to claim 1 wherein the radio communication is bi-directional but instantaneously uni-directional, and said signals comprise data placed in packets or blocks wherein the initial symbols in each block are reserved for signalling the number of bits/symbol used in the block
11. A radio transceiver comprising:a radio receiver for receiving radio signals; means for assessing a quality of the received radio signals; means for selecting a transmission modulation state on the basis of the assessment of the quality of the received signals; a radio transmitter for transmitting signals using a modulation scheme having a plurality of modulation states; means for adjusting the transmitting state of the radio transmitter to be the selected modulation state; and signalling means for including in the signals to be transmitted an indication of the selected modulation state.', 'a radio receiver for receiving radio signals;', 'means for assessing a quality of the received radio signals;', 'means for selecting a transmission modulation state on the basis of the assessment of the quality of the received signals;', 'a radio transmitter for transmitting signals using a modulation scheme having a plurality of modulation states;', 'means for adjusting the transmitting state of the radio transmitter to be the selected modulation state; and', 'signalling means for including in the signals to be transmitted an indication of the selected modulation state.']
Associated Portfolios
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SUMMARY
ClaimChart-US5828695-STO
Patent number:US5828695
Claim Chart Type : SEP Claim Chart
Price: 200 €
Note:
The information in blue was extracted from the third parties (Standard Setting Organisation, Espacenet)
The information in grey was provided by the patent holder
The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.