摘要:
The present invention provides methods for selecting the coarse frequency offset estimation in an orthogonal frequency division multiplexing system that may include: searching within a predefined subset for a set of frequency offset candidates; selectively searching outside the predefined subset for additional frequency offset candidates; and combining one or more ICDC method and CIR based method to select the coarse frequency offset.
摘要:
A method codes multiple data streams in multiple-input, multiple-output communications systems. In a transmitter, an input bitstream is encoded as codewords b in multiple layers. Each layer is modulated. A quasi-block diagonal, low-density parity-check code is applied to each layer, the quasi-block diagonal, parity-check code being a matrix H, the matrix H including one row of blocks for each subcode, and one row of blocks for each layer such that Hb=0 for any valid codeword. The layers are then forwarded to transmit antennas as a transmitted signal x.
摘要:
The present invention provides methods for selecting the coarse frequency offset estimation in an orthogonal frequency division multiplexing system that may include: searching within a predefined subset for a set of frequency offset candidates; selectively searching outside the predefined subset for additional frequency offset candidates; and combining one or more ICDC method and CIR based method to select the coarse frequency offset.
摘要:
This invention relates to methods for determining symbol timing shift for a received signal, comprising the steps of: demodulating a received signal; removing a phase reference sequence from the demodulated signal to generate a channel frequency response; converting said channel frequency response to the time domain to generate a channel impulse response; determining a detection threshold; determining a first path and a last path as a function of the detection threshold; and calculating a timing shift as a function of the first path and the last path.
摘要:
This invention provides methods for reducing the bit width of soft information, while maintaining a large dynamic range by applying compression and expansion. In particular, this invention provides methods for time de-interleaving of soft information, comprising the steps of: quantizing the soft information into a first soft information having a first pre-defined number of bits; compressing the first soft information into a second soft information having a second pre-defined number of bits; time de-interleaving the second soft information; and decompressing the time de-interleaved second soft information.
摘要:
A method minimizes a rate for feeding back channel state information from a receiver to a transmitter in a multi-input, multi-output communications systems. A temporal autocorrelation function of the channel between the transmitter and the receiver is determined. A spatial covariance information is estimated of the channel. Then, the minimum rate for feeding back channel state information from the receiver to the transmitter is based on actual channel state information and the estimated spatial covariance information and the temporal autocorrelation function.
摘要:
A method transmits transmitting training frames in a MIMO system. A long sequence of training frames is transmitted from a station B to a station A via a channel of the MIMO system, in which the station A includes NA antennas and N—SS RF chains and the station B includes NB antennas and NB—SS RF chains, and a number of frames in the long sequence of training frames is at least equal to A short sequence of training frames is transmitted from the station A to the station B via the channel in response to receiving the long sequence of training frames. A number of frames in the short training sequence is at least equal to
摘要翻译:一种在MIMO系统中发送训练帧的方法。 训练帧的长序列经由MIMO系统的信道从站B发送到站A,其中,站A包括NA天线,并且N - SUB 2> SUB> SS SUB> RF链,并且站B包括N个B个天线和N B个天线,并且N B个< SUB> SS RF链,并且训练帧的长序列中的多个帧至少等于A响应于接收,经由信道从站A向站B发送短序列的训练帧 训练框架的长序列。 短训练序列中的多个帧至少等于
摘要:
This invention relates to methods for determining coarse symbol timing and mode detection by using CP correlation-based techniques. In particular, this invention relates to methods for determining symbol timing, frame timing, and system mode for signal acquisition, comprising the steps of: detecting symbol timing and system mode based on cyclic prefix correlation; and determining a null symbol as a function of a pre-defined number of consecutive symbols and using said null symbol to determine frame timing.
摘要:
A method transmits training frames in a MIMO system. A long sequence of training frames is transmitted from a station B to a station A via a channel of the MIMO system, in which the station A includes NA antennas and NA—SS RF chains and the station B includes NB antennas and NB—SS RF chains, and a number of frames in the long sequence of training frames is at least equal to where is a lower bound operator. A short sequence of training frames is transmitted from the station A to the station B via the channel in response to receiving the long sequence of training frames. A number of frames in the short training sequence is at least equal to
摘要翻译:一种方法在MIMO系统中发送训练帧。 训练帧的长序列经由MIMO系统的信道从站B发送到站A,其中站A包括NA天线和NA SS-射频链,并且站B包括 NB天线和NB sub2> SS RF链,并且训练帧的长序列中的多个帧至少等于下界运算符的位置。 响应于接收到长的训练帧序列,经由信道将短序列的训练帧从站A发送到站B. 短训练序列中的多个帧至少等于
摘要:
A method minimizes a rate for feeding back channel state information from a receiver to a transmitter in a multi-input, multi-output communications systems. A temporal autocorrelation function of the channel between the transmitter and the receiver is determined. A spatial covariance information is estimated of the channel. Then, the minimum rate for feeding back channel state information from the receiver to the transmitter is based on actual channel state information and the estimated spatial covariance information and the temporal autocorrelation function.