发明名称 |
System and method for improving receiver sensitivity of a DD-OFDM system without using frequency guard band |
摘要 |
A system and method for improving receiver sensitivity of an DD-OFDM system without using frequency guard band. The method having: interleaving input data to the DD-OFDM system to generate interleaved data; encoding the input data with a first recursive systematic convolutional code to generate a first recursive systematic convolutional encoded data; encoding the interleaved data with a second recursive systematic convolutional code to generate a second recursive systematic convolutional encoded data; puncturing the first recursive systematic convolutional encoded data and the second recursive systematic convolutional encoded data to generate a parity sequence; and combining the input data with the parity sequence to generate coded DD-OFDM data; wherein the parity sequence is generated by using different puncturing rates for different OFDM subcarriers, so as to obtain higher spectral efficiency. |
申请公布号 |
US8897645(B2) |
申请公布日期 |
2014.11.25 |
申请号 |
US201013991068 |
申请日期 |
2010.12.01 |
申请人 |
ZTE (USA) Inc. |
发明人 |
Yu Jianjun |
分类号 |
H04J4/00;H04L1/00;H03M13/29;H03M13/31;H03M13/00;H04L1/04;H04L27/26;H04B10/04 |
主分类号 |
H04J4/00 |
代理机构 |
Brooks Kushman P.C. |
代理人 |
Brooks Kushman P.C. |
主权项 |
1. A system for improving receiver sensitivity of an optical Direct Detection-Orthogonal frequency division modulation (DD-OFDM) system without using frequency guard band, comprising:
an interleaver configured to interleave input data to the DD-OFDM system to generate interleaved data; a first recursive systematic convolutional encoder configured to encode the input data with a first recursive systematic convolutional code to generate a first recursive systematic convolutional encoded data; a second recursive systematic convolutional encoder configured to encode the interleaved data with a second recursive systematic convolutional code to generate a second recursive systematic convolutional encoded data; a puncturing device configured to puncture the first recursive systematic convolutional encoded data and the second recursive systematic convolutional encoded data to generate a parity sequence; and a combiner configured to combine the input data with the parity sequence to generate coded DD-OFDM data; wherein the puncturing device is configured to use different puncturing rates for different OFDM subcarriers to generate the parity sequence, so as to obtain higher spectral efficiency. |
地址 |
Iselin NJ US |