October, 2009doc.: IEEE 802.22-09/0192r1
IEEE P802.22
Wireless RANs
Date: 2009-10-20
Author(s):
Name / Company / Address / Phone / email
Chang-Joo Kim / ETRI / Korea / +82-42-860-1230 /
Myung-Sun Song / ETRI / Korea / +82-42-860-5046 /
Jung-Sun Um / ETRI / Korea / +82-42-860-4844 /
Gwang-Zeen Ko / ETRI / Korea / +82-42-860-4862 /
Sung-Hyun Hwang / ETRI / Korea / +82-42-860-1133 /
The convolutional encoder using tail bit is defined in the draft v2.0. Relating to this, comment ID 864 and 867aresubmitted and it was decided to limit the standard to tail biting by a motion in September 2009. Therefore, the section of convolutional encoder in the draft shall be modified.The resolutions are below with red.
Resolutions
Line 16 in the page 346
Figue 166 Partitioning of a data burst into data blocks
Line 7 in the page 347
8.7.2.1.1Convolutional coding
The data burst is encoded using a rate – ½ binary convolutional encoder. The constraint length of this coder is equal to 7 and its generator polynomials are 171o and 133o for outputs A and B respectively. Figure 168 is a graphical description of the generator polynomials. Output A and output B represent the first and second output bits respectively of this encoder.
The convolutional coder shall be initialized at the beginning of the control headers and at the beginning of eachPSDU datablockburst. Tail biting shall be used with both control headersand the PSDU data. , while tail bits (6 in number) shall be used with the burst or PSDU data. This implies that for the case of control headers, the encoder memory is initialized with the last 6 bits in the headers andfor the case of PSDU data, the encoder memory is initialized to an all zeros statewith the last 6 bits in each PSDU data burst.
Submissionpage 1Chang-Joo, Kim, ETRI