CODE WORD MAPPING METHOD SUITABLE FOR MULTI-LEVEL MODULATION

Title:

CODE WORD MAPPING METHOD SUITABLE FOR MULTI-LEVEL MODULATION

Document Type and Number:

Japanese Patent JP3815344

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To solve the problem that error rate characteristics are deteriorated at assigning post-transmission path encoding data to multi-level modulation bits in a conventional radio communication device.
SOLUTION: At executing code word mapping in radio communication equipment, different mapping patterns are set for each S/N, and the output code words of an encoder are not assigned uniformly to the multi-level modulation bits but weighted and assigned according to the error resistivity of the multi- level modulation bits, and the mapping pattern is switched and operated according to the S/N. Thus, it is possible to execute communication with high communication quality by updating the code word mapping method in order to always minimize an error rate according to the conditions or S/N rate of a transmission path.

More Like This:

JP6157716	How to modulate an electric power encoder and data
JPH08293815	COPROCESSOR PERFORMING PLURALITY OF COMMUNICATION TASK ON INTEGRATED CIRCUIT
WO/2017/219434	METHOD AND SYSTEM FOR OPTICAL PERFORMANCE MONITORING

Inventors:

Masayuki Hanaoka
Takashi Yano

Application Number:

JP2002044114A

Publication Date:

August 30, 2006

Filing Date:

February 21, 2002

Export Citation:

Click for automatic bibliography generation Help

Assignee:

株式会社日立製作所

International Classes:

H04L27/00; H03M13/25; H03M13/27; H04L1/00; H04L27/34; (IPC1-7): H04L27/00; H04L1/00; H04L27/34

Domestic Patent References:

JP9023212A
JP4313983A
JP2000201132A
JP7283740A
JP2000165865A

Attorney, Agent or Firm:

Manabu Inoue

Previous Patent: VIEWING APPARATUS AND CHARACTER INFORMATION OUTPUT METHOD

Next Patent: INTERNAL COMBUSTION ENGINE WITH VARIABLE SHIFT VALVE MECHANISM