Title:
METHOD AND SYSTEM FOR ADAPTIVE MODULATED TRANSMISSION
Document Type and Number:
Japanese Patent JP3240262
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve error rate and information transmission efficiency by easily applying an adaptive modulating method, even to a TDMA-FDD system at different upper and lower frequencies to be used by demodulating a signal, corresponding to a reception time slot from a TDMA processing part.
SOLUTION: A timing signal showing the reception time slot of a present station is applied from a TDMA processing part 5 to an adaptive demodulation part 4. Thus, the demodulation part 4 extracts the signal of a time slot designated by that timing signal from orthogonal signals I and Q outputted from an RF part 2. Afterwards, that modulating system is detected, the data are demodulated and sent to the TDMA processing part 5 and an MI (modulating system request signal) for MS transmission from a base station is sent to a control part 6. Thus, by shortening a frame cycle, the state change in a propagation path between two transmission frames is sufficiently reduced and even in the case of the TDMA-FDD system of which the frequencies to be used for up and down are made different, the adaptive modulating system can be easily applied, so that the error rate and information transmission efficiency can be improved.
Inventors:
Masashi Naito
Application Number:
JP19617196A
Publication Date:
December 17, 2001
Filing Date:
July 25, 1996
Export Citation:
Assignee:
Hitachi Kokusai Electric Co., Ltd.
International Classes:
H04L27/00; H04B7/26; H04J3/00; (IPC1-7): H04B7/26; H04J3/00; H04L27/00
Domestic Patent References:
| JP6152494A | ||||
| JP8274756A |
Other References:
【文献】Norihiko MORINAGA,et.al.”Intelligent Radio Communication Techniques for advanced Wireless Communications Systems”IEICE Trans.COMMUN.VOL.E79-B,No.3,March 1996
Attorney, Agent or Firm:
Yoshihiro Takasaki
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