Orthogonal frequency division multiplexing having tones with overlaid data and pilot symbols
    2.
    发明申请
    Orthogonal frequency division multiplexing having tones with overlaid data and pilot symbols 审中-公开
    具有重叠数据和导频符号的音调的正交频分复用

    公开(公告)号:US20080225689A1

    公开(公告)日:2008-09-18

    申请号:US11717540

    申请日:2007-03-13

    IPC分类号: H04J11/00

    CPC分类号: H04L5/0048 H04L5/0007

    摘要: In one embodiment, an OFDM transmitter generates sets of frequency-domain data symbols from a stream of digital data. For each set of frequency-domain data symbols generated, the transmitter generates a corresponding set of frequency-domain pilot symbols. Each corresponding set of data symbols and pilot symbols are then multiplexed onto a set of frequency tones, such that, at least one tone is occupied by both a data symbol and a pilot symbol. For each tone having both a pilot symbol and data symbol, the pilot symbol and data symbol are added together to form an overlaid data and pilot (ODP) tone. Each set of tones having at least one ODP tone is then transmitted to an inverse fast Fourier transform (IFFT) processor that transforms each set of tones into an ODP OFDM symbol. Each ODP OFDM symbol is then prepared for transmission using digital-to-analog conversion, cyclic prefix insertion, and RF modulation.

    摘要翻译: 在一个实施例中,OFDM发射机从数字数据流生成多个频域数据符号。 对于生成的每组频域数据符号,发射机产生相应的一组频域导频符号。 然后将每个对应的数据符号和导频符号集合复用到一组频率音调上,使得至少一个音调由数据符号和导频符号两者占据。 对于具有导频符号和数据符号的每个音调,将导频符号和数据符号相加在一起以形成叠加数据和导频(ODP)音调。 然后将具有至少一个ODP音调的每组音调发送到将每组音调转换为ODPOFDM符号的快速傅里叶逆变换(IFFT)处理器。 然后,使用数模转换,循环前缀插入和RF调制来准备每个ODP OFDM符号进行传输。