[특허]Apparatus and method for communicating digital data using trellis coding with punctured convolutional codes

Apparatus and method for communicating digital data using trellis coding with punctured convolutional codes 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H04L-005/12 H03M-013/12
출원번호	US-0054642 (1993-05-05)
발명자 / 주소	How Stephen K. (San Diego CA)
출원인 / 주소	GI Corporation (Hatboro PA 02)
인용정보	피인용 횟수 : 111 인용 특허 : 0

초록 ▼

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 ½binary 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.

대표청구항 ▼

Apparatus for processing digital data for transmission using trellis coded quadrature amplitude modulation (QAM) based on a 2N point two dimensional QAM constellation where N is an integer greater than one, at a symbol rate of FS QAM symbols per second, comprising: means for splitting an original information data stream provided at a data rate of ((N-2)+2n/k)FS bits per second into a first “uncoded”information stream having a data rate of (N-2)FS bits per second and a second “coded”information stream having a data rate of (2n/k)FS bits per second, where n/k is a punctured rate of a binary convolutional code and has a value less than one; means for encoding said second information stream using said punctured rate n/k binary convolutional code; means for buffering the encoded second information stream to provide two encoded bits per QAM symbol; means for buffering the first information stream to provide (N-2) uncoded bits per QAM symbol; and means responsive to said buffered first and second information streams for providing successive QAM symbols, each QAM symbol consisting of orthogonal in-phase (I) and quadrature-phase (Q) components derived from two of the buffered encoded bits and (N-2) of the buffered uncoded bits, said two buffered encoded bits designating one of four symbol groups provided in said QAM constellation for partial identification of said QAM symbols.

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Apparatus and method for communicating digital data using trellis coding with punctured convolutional codes 원문보기

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Apparatus and method for communicating digital data using trellis coding with punctured convolutional codes 원문보기

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