发明名称 |
APPARATUS AND METHOD FOR COMMUNICATING DIGITAL DATA USING TRELLIS CODING WITH PUNCTURED CONVOLUTIONAL CODES |
摘要 |
Punctured binary convolutional codes are used in a trellis coded modulation scheme to achieve spectral efficiencies as high as those of multi-dimensional codes, using simple hardware. A base rate 1/2 binary convolutional code is punctured to rate n/k. The output of the punctured encoder is mapped to a four-way partition of a 2N point two-dimensional QAM constellation. The four-way partition consists of a two-way partition in both the I and Q dimensions. The two-way partitions of each dimension are used to transmit the two level output of the rate n/k binary convolutional coder. (N-2) "uncoded" bits are transmitted by selecting the unique constellation point in a partition group. The code has an average throughput of (N-2)+2n/k bits per symbol. The invention is also applicable to trellis coded amplitude modulation schemes based on 2N possible amplitude levels provided along a one-dimensional constellation.
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申请公布号 |
CA2122753(C) |
申请公布日期 |
1998.12.15 |
申请号 |
CA19942122753 |
申请日期 |
1994.05.03 |
申请人 |
GENERAL INSTRUMENT CORPORATION OF DELAWARE |
发明人 |
HOW, STEPHEN K. |
分类号 |
H03M7/36;H03M13/00;H04L27/34;(IPC1-7):H04L27/34;H04N5/44;H04N7/015 |
主分类号 |
H03M7/36 |
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