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    • 7. 发明申请
    • SPARSE CHANNEL ESTIMATION FOR ORTHOGONAL FREQUENCY DIVISION MULTIPLEXED SIGNALS
    • 正交频分多路复用信号的稀疏信道估计
    • US20070223610A1
    • 2007-09-27
    • US11750039
    • 2007-05-17
    • Eric Jacobsen
    • Eric Jacobsen
    • H04K1/10
    • H04L25/0234H04L27/2647
    • A computationally efficient channel estimation technique for use within an orthogonal frequency division multiplexing (OFDM) communication system determines coefficients of a channel transfer function by calculating the dot products of a pilot vector and a plurality of interpolation vectors. One dot product is preferably calculated for each subcarrier of interest within the system. The pilot vector is extracted from an OFDM symbol received from a communication channel. In a preferred approach, a number of interpolation vectors are precalculated and stored within a communication device for subsequent use during channel estimation and equalization operations. The technique is highly flexible and can be implemented using, for example, a variable user block size or a variable pilot vector size.
    • 在正交频分复用(OFDM)通信系统中使用的计算有效的信道估计技术通过计算导频矢量和多个插值向量的点积来确定信道传递函数的系数。 对于系统内的感兴趣的每个子载波,优选地计算一个点积。 从从通信信道接收的OFDM符号中提取导频向量。 在优选的方法中,预先计算多个内插向量并将其存储在通信设备中,以便在信道估计和均衡操作期间随后使用。 该技术是高度灵活的,并且可以使用例如可变用户块大小或可变导频矢量大小来实现。
    • 10. 发明申请
    • Forward error correction coding in communication networks
    • 通信网络中的前向纠错编码
    • US20050111345A1
    • 2005-05-26
    • US10723133
    • 2003-11-25
    • Eric JacobsenJohn Sadowsky
    • Eric JacobsenJohn Sadowsky
    • H04L1/00H04L1/18H04L27/26H04J11/00
    • H04L1/005H04L1/0041H04L1/0057H04L27/2602
    • Methods, apparatus and systems are disclosed for block encoding/decoding information wireless networks having narrow decoding latency restrictions. A method includes identifying a length of information to be sent in a block code and encoding the information to be sent in the block code into one or more codewords, where the number of codewords and the amount of information encoded within each codeword is adjusted based on the identified length and to achieve a similar codeword error probability for each codeword considering available decoding time for decoding a last codeword is less than available decoding time for decoding a first codeword. In certain implementations low density parity check (LDPC) encoding may be used in combination with OFDM to provide reliable communications in a high throughput WLAN.
    • 公开了用于具有窄解码延迟限制的块编码/解码信息无线网络的方法,装置和系统。 一种方法包括识别要在块码中发送的信息的长度,并将要在块码中发送的信息编码成一个或多个码字,其中码字的数量和在每个码字内编码的信息量基于 考虑用于解码最后一个码字的可用解码时间,识别的长度并且为每个码字实现类似的码字错误概率小于用于解码第一码字的可用解码时间。 在某些实施方式中,低密度奇偶校验(LDPC)编码可以与OFDM组合使用以在高吞吐量WLAN中提供可靠的通信。