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公开(公告)号：AU4876400A
公开(公告)日：2001-02-01
申请号：AU4876400
申请日：2000-07-21
Applicant: LUCENT TECHNOLOGIES INC
Inventor： KRISHNAMOORTHY RAJEEV , LI XIAODONG , NARAYANASWAMY SHANKAR , RUPP MARKUS , VISWANATHAN HARISH
Abstract: In a wireless communication system, the constellation mapping scheme employed may be changed on a per-time-slot basis, i.e., from time slot to time slot, so that the constellation used to encode the symbols of each time slot may be different for each time slot within a single frame and may be different for a particular time slot in different consecutive frames. In other words, several constellation mapping schemes are available, with each providing the ability to transmit a different number of bits per symbol, and the particular constellation mapping scheme employed for any time slot need be selected for that time slot only. The ability to use any particular constellation mapping scheme is dependent on the current channel quality. The particular constellation mapping used for the user data of the time slot may be indicated in the preamble of the time slot. To this end, each time slot may have its own preamble that is mapped with a constellation mapping scheme which is a) known Ù priori, b) may be the same for all time slots, and c) may be different from the constellation mapping scheme used to encode user data in the time slot. A receiver can determine the constellation mapping used for each time slot from solely from the preamble of the time slot.
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公开(公告)号：CA2313817A1
公开(公告)日：2001-01-27
申请号：CA2313817
申请日：2000-07-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI XIAODONG , VISWANATHAN HARISH , RUPP MARKUS , NARAYANASWAMY SHANKAR , KRISHNAMOORTHY RAJEEV
Abstract: In a wireless communication system, the constellation mapping scheme employ ed may be changed on a per-time-slot basis, i.e., from time slot to time slot, so that the constellation used to encode the symbols of each time slot may be different for each time slot within a single frame and may be different for a particular time slot i n different consecutive frames. In other words, several constellation mapping schemes ar e available, with each providing the ability to transmit a different number of bits per symbol, and the particular constellation mapping scheme employed for any time slot need be selected for that time slot only. The ability to use any particular constellation mapping scheme is dependent on the current channel quality. The particular constellation mappi ng used for the user data of the time slot may be indicated in the preamble of the time slot. To this end, each time slot may have its own preamble that is mapped with a constellation mapping scheme which is a) known à priori, b) may be the same for all time slots, and c) may be different from the constellation mapping scheme used to encode user data in the time slot. A receiver can determine the constellation mapping used for each time slot from solely from the preamble of the time slot.
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公开(公告)号：CA2244327A1
公开(公告)日：1999-02-20
申请号：CA2244327
申请日：1998-07-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ROSENTHAL EUGENE J , NARAYANASWAMY SHANKAR
Abstract: A portable or other electronic device has two or more display devices or scr eens that can be used to display different subsets of image signals. The effect is that the d evice simulates the display capabilities of devices having much larger screens. The device has an open o r active configuration, in which the multiple screens are available for displaying image signals, an d a closed or inactive configuration, in which some or all of the multiple screens are folded toget her or otherwise stowed away to reduce the size of the device for storage and/or carrying. By simula ting large-display operations, electronic devices according to the present invention are capabl e of presenting more useable information to the user than is otherwise possible using prior art d evices having a single small screen.
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