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Communication system, receiver, transmitter, and communication method

A communication system and receiver technology, applied in the field of communication systems, can solve problems such as communication frame redundancy

Inactive Publication Date: 2005-06-29
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the above-mentioned conventional communication method, since the preamble and the user code are arranged in the communication frame to perform synchronization control and user detection, there is a problem of redundancy of the communication frame

Method used

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  • Communication system, receiver, transmitter, and communication method
  • Communication system, receiver, transmitter, and communication method
  • Communication system, receiver, transmitter, and communication method

Examples

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Embodiment approach 1

[0047] FIG. 1 is a diagram showing a communication system according to the present invention, that is, an LDPC (Low-Density Parity-Check) encoding / decoding system. In Fig. 1, 1 is an encoder, 2 is a modulator, 3 is a communication path, 4 is a demodulator, and 5 is a decoder.

[0048] Here, before explaining the communication method according to the present invention, the flow of encoding and decoding in the case of using LDPC codes will be described.

[0049] First, in the encoder 1 on the transmission side, an inspection matrix H is generated by a predetermined method described later. Therefore, the generator matrix G is obtained based on the following conditions.

[0050] G: k×n matrix (k: information length, n: code word length)

[0051] GH T =0(T is transpose matrix)

[0052] Thereafter, in encoder 1, a message (m 1 m 2 ...m k ), using the generator matrix G above to generate the codeword C.

[0053] C=(m1 m 2 ...m k )G

[0054] =(c 1 c 2 ... c n ) (but H(c ...

Embodiment approach 2

[0121] In Embodiment 2, a user detection method in a communication device according to the present invention will be described.

[0122] FIG. 15 is a diagram showing the system configuration of Embodiment 2, where 11 is a transmitter, and 12 and 13 are receivers. In this embodiment, LDPC codes are provided with diversity, and each code is assigned to a user to detect the user.

[0123] As described in the above-mentioned synchronous control, since at the receiving side, if the generation matrix G of the LDPC code at the sending side is not in a 1-to-1 correspondence with the check matrix H at the corresponding receiving side, decoding cannot be performed, so here, FIG. 9 exemplifies The overall of is changed as shown in Fig. 16 and Fig. 17 to diversify the inspection matrix.

[0124] Specifically, the weight distribution shown in FIG. 16 is performed for user A, and the weight distribution shown in FIG. 17 is performed for user B. For example, in the transmitter:receiver rat...

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Abstract

The composition of the communication system of the present invention includes: a transmitter for performing LDPC encoding; and a receiver for performing LDPC decoding on the received data of a codeword length sampled from a predetermined sampling start point by using the "Sum-Product algorithm", and using it as the decoding result The sum of the absolute value of the posterior probability logarithm likelihood ratio of each output is used for synchronous control and user detection.

Description

technical field [0001] The present invention relates to a communication system that can perform synchronization control and user detection without using specific code elements such as preamble codes and user codes, and particularly relates to a communication system that can use a check matrix corresponding to a generation matrix during encoding to perform synchronization control And user detection communication device, receiver, transmitter and communication method. Background technique [0002] Hereinafter, conventional synchronization establishment methods and user detection methods will be described. First, a conventional synchronization establishment method will be described. For example, on the transmitting side, N signals (preambles) whose phases are inverted are transmitted (see the upper and middle stages of FIG. 19 ). On the other hand, on the receiving side, phase inversion in the preamble is detected, a synchronization signal is output at this timing (see the lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H03M13/11H03M13/45H04J3/26H04L7/00
CPCH03M13/1111H03M13/118H03M13/1194H03M13/2957H03M13/33H04L1/0046H04L1/005H04L1/0057
Inventor 松本涉
Owner MITSUBISHI ELECTRIC CORP