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    • 5. 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。
    • 6. 发明申请
    • SYMBOL DE-MAPPING METHODS IN MULTIPLE-INPUT MULTIPLE-OUTPUT SYSTEMS
    • 多输入多输出系统中的符号去映射方法
    • US20080025430A1
    • 2008-01-31
    • US11844200
    • 2007-08-23
    • John Sadowsky
    • John Sadowsky
    • H04L1/02
    • H04L25/03216H04L25/03222H04L25/03229H04L25/067H04L27/3488H04L27/38H04L2025/0342H04L2025/03426
    • In a multiple-input multiple-output (MIMO) system, multiple receive antennas produce a received signal vector, Y, which includes an element for each of the receive antennas. In an embodiment of a de-mapping method performed within a MIMO receiver, a quadrature phase shift keying (QPSK) search is performed within a search space that includes the full constellation of symbol points. Based on the results of the QPSK search, the search space is reduced to fewer than all of the quadrants, and the received signal vector data is scaled and transformed to the reduced search space. A lower-level QPSK search is performed, and the process is repeated until the modulation order is reduced to a QPSK constellation. Hard or soft decisions corresponding to the search results may then be passed to a decoder.
    • 在多输入多输出(MIMO)系统中,多个接收天线产生接收信号向量Y,其包括用于每个接收天线的元件。 在MIMO接收机内执行解映射方法的实施例中,在包括符号点的全部星座的搜索空间内执行正交相移键控(QPSK)搜索。 基于QPSK搜索的结果,搜索空间减少到比所有象限少,并且接收的信号向量数据被缩放并变换到缩小搜索空间。 执行较低级的QPSK搜索,并且重复该处理,直到调制阶数减小到QPSK星座。 然后可以将对应于搜索结果的硬判决或软判决传递给解码器。