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    VARIED SIGNALING CHANNELS FOR A REVERSE LINK IN A WIRELESS COMMUNICATION SYSTEM
    74.
    发明公开
    VARIED SIGNALING CHANNELS FOR A REVERSE LINK IN A WIRELESS COMMUNICATION SYSTEM 有权
    不同信令信道用于在无线通信系统的反向链路

    公开(公告)号：EP1941775A1

    公开(公告)日：2008-07-09

    申请号：EP06839602.7

    申请日：2006-10-27

    申请人： QUALCOMM Incorporated

    发明人： GOROKHOV, Alexei ,  KHANDEKAR, Aamod ,  TEAGUE, Edward Harrison ,  SAMPATH, Hemanth

    IPC分类号： H04Q7/38

    CPC分类号： H04B7/2656

    摘要： Signaling is efficiently sent on a configurable CDMA control segment. To send signaling, transmission parameters for the CDMA control segment for a serving sector are determined. These parameter may indicate the CDMA control segment size, the frames in which the CDMA control segment is sent, the signaling channels to be sent on the CDMA control segment, and so on. The enabled CDMA signaling channels for a terminal and the average transmission interval for each enabled CDMA signaling channel are determined. For each frame in which the CDMA control segment is sent, the signaling channels to be sent on the CDMA control segment in that frame are determined. The signaling for each signaling channel is processed (e.g., encoded, channelized, scaled, and scrambled). The processed signaling for all signaling channels is combined and mapped to a time-frequency region used for the CDMA control segment in the frame.

    ENHANCED FREQUENCY DIVISION MULTIPLE ACCESS FOR WIRELESS COMMUNICATION
    77.
    发明公开
    ENHANCED FREQUENCY DIVISION MULTIPLE ACCESS FOR WIRELESS COMMUNICATION 有权
    无线Komminikation频分多址

    公开(公告)号：EP1884096A2

    公开(公告)日：2008-02-06

    申请号：EP06760244.1

    申请日：2006-05-18

    申请人： QUALCOMM INCORPORATED

    发明人： PALANKI, Ravi ,  KHANDEKAR, Aamod

    IPC分类号： H04L27/26

    CPC分类号： H04L27/2618 ,  H04L5/0007 ,  H04L5/0039 ,  H04L5/0041 ,  H04L5/0046 ,  H04L25/0228 ,  H04L25/03159

    摘要： Enhanced frequency division multiple access (EFDMA) is a multiplexing scheme that sends modulation symbols in the time domain and achieves a lower PAPR than OFDM. An EFDMA symbol occupies multiple subband groups that are spaced apart in a frequency band, with each subband group containing multiple adjacent subbands. To generate an EFDMA symbol, multiple modulation symbols are mapped onto a first sequence of symbols. A transform (e.g., a DFT) is performed on the first sequence to obtain a second sequence of values. The values in the second sequence corresponding to the subbands used for the EFDMA symbol are retained, and the remaining values are zeroed out to obtain a third sequence of values. An inverse transform (e.g., an IDFT) is performed on the third sequence to obtain a fourth sequence of samples. A phase ramp may be applied on the fourth sequence, and a cyclic prefix is appended to form the EFDMA symbol.

    PILOT TRANSMISSION AND CHANNEL ESTIMATION FOR A COMMUNICATION SYSTEM UTILIZING FREQUENCY DIVISION MULTIPLEXING
    78.
    发明公开
    PILOT TRANSMISSION AND CHANNEL ESTIMATION FOR A COMMUNICATION SYSTEM UTILIZING FREQUENCY DIVISION MULTIPLEXING 有权
    导频传输和信道估计用于与频分复用的通信系统

    公开(公告)号：EP1867063A1

    公开(公告)日：2007-12-19

    申请号：EP06737468.6

    申请日：2006-03-07

    申请人： QUALCOMM INCORPORATED

    发明人： PALANKI, Ravi ,  KHANDEKAR, Aamod

    IPC分类号： H04B1/69 ,  H04L27/26

    CPC分类号： H04B1/69 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/0212 ,  H04L25/022 ,  H04L25/023 ,  H04L25/025 ,  H04L27/2613 ,  H04L2025/03624

    摘要： A transmitter generates a pilot having a constant time-domain envelope and a flat frequency spectrum based on a polyphase sequence. To generate a pilot IFDMA symbol, a first sequence of pilot symbols is formed based on the polyphase sequence and replicated multiple times to obtain a second sequence of pilot symbols. A phase ramp is applied to the second pilot symbol sequence to obtain a third sequence of output symbols. A cyclic prefix is appended to the third sequence of output symbols to obtain an IFDMA symbol, which is transmitted in the time domain via a communication channel. The pilot symbols may be multiplexed with data symbols using TDM and/or CDM. A pilot LFDMA symbol may also be generated with a polyphase sequence and multiplexed using TDM or CDM. A receiver derives a channel estimate based on received pilot symbols and using minimum mean-square error, least-squares, or some other channel estimation technique.

    CHANNEL ESTIMATION FOR AN OFDM COMMUNICATION SYSTEM WITH INACTIVE SUBBANDS
    80.
    发明公开
    CHANNEL ESTIMATION FOR AN OFDM COMMUNICATION SYSTEM WITH INACTIVE SUBBANDS 审中-公开
    信道估计和未激活子带的OFDM通信系统

    公开(公告)号：EP1698129A2

    公开(公告)日：2006-09-06

    申请号：EP04815145.0

    申请日：2004-12-20

    申请人： Qualcomm, Incorporated

    发明人： MANTRAVADI, Ashok ,  KHANDEKAR, Aamod ,  TEAGUE, Edward Harrison ,  KADOUS, Tamer

    IPC分类号： H04L25/02

    CPC分类号： H04L25/022 ,  H04L25/0218 ,  H04L25/0232

    摘要： For channel estimation in a spectrally shaped wireless communication system, an initial frequency response estimate is obtained for a first set of P uniformly spaced subbands (1) based on pilot symbols received on a second set of subbands used for pilot transmission and (2) using extrapolation and/or interpolation, where P is a power of two. A channel impulse response estimate is obtained by performing a P-point IFFT on the initial frequency response estimate. A final frequency response estimate for N total subbands is derived by (1) setting low quality taps for the channel impulse response estimate to zero, (2) zero-padding the channel impulse response estimate to length N, and (3) performing an N-point FFT on the zero-padded channel impulse response estimate. The channel frequency/impulse response estimate may be filtered to obtain a higher quality channel estimate.