Source: http://www.google.com/patents/US6700881?dq=6,788,314
Timestamp: 2016-07-28 15:14:16
Document Index: 261635871

Matched Legal Cases: ['art 351', 'art 351', 'art 352', 'art 352', 'art 441', 'art 442', 'arts 1021', 'arts 1021', 'arts 1026', 'arts 1021']

Patent US6700881 - Rate control device and method for CDMA communication system - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA traffic channel transmission device for a CDMA communication system using a plurality of coding rates and orthogonal codes, determines a present channel condition and adaptively selects a coding rate and an orthogonal code according to the determination. In the device, a channel receiver receives a...http://www.google.com/patents/US6700881?utm_source=gb-gplus-sharePatent US6700881 - Rate control device and method for CDMA communication systemAdvanced Patent SearchPublication numberUS6700881 B1Publication typeGrantApplication numberUS 09/260,213Publication dateMar 2, 2004Filing dateMar 1, 1999Priority dateMar 2, 1998Fee statusPaidAlso published asCA2287321A1, CA2287321C, CN1130856C, CN1256821A, DE69936023D1, DE69936023T2, EP0979562A1, EP0979562B1, US7227836, US20030128674, WO1999045660A1Publication number09260213, 260213, US 6700881 B1, US 6700881B1, US-B1-6700881, US6700881 B1, US6700881B1InventorsSeung-Hyun Kong, Young-Ky Kim, Jae-Min Ahn, Soon-Young YoonOriginal AssigneeSamsung Electronics Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (14), Referenced by (147), Classifications (26), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetRate control device and method for CDMA communication system
A first signal mapping part 351 converts levels of the binary data output from the first mixer 341 by converting data “0” to “+1” and data “1” to “−1”. A first orthogonal modulator 361 includes a first orthogonal code generator (not shown) which generates a first orthogonal code for orthogonally modulating the first encoded data according to the orthogonal code number and length signals Wno and Wlength output from the decision block 213. The first orthogonal modulator 361 multiples the first orthogonal code generated according to the orthogonal code number and length signals Wno and Wlength by the data output from the first signal mapping part 351 to generate a first orthogonal modulation signal. Here, it is assumed that the Walsh code is used for the orthogonal code and a Walsh code of length 256 is used for the data encoded at the first coding rate of 1/3.
A second signal mapping part 352 converts levels of the binary data output from the second mixer 342 by converting data “0” to “+1” and data “1” to “−1”. A second orthogonal modulator 362 includes a second orthogonal code generator (not shown) which generates a second orthogonal code for orthogonally modulating the second encoded data according to the orthogonal code number and length signals Wno and Wlength output from the decision block 213. The second orthogonal modulator 362 multiples the second orthogonal code generated according to the orthogonal code number and length signals Wno and Wlength by the data output from the second signal mapping part 352 to generate a second orthogonal modulation signal. Here, it is assumed that the Walsh code is used for the orthogonal code and a Walsh code of length 128 is used for the data encoded at the second coding rate of 1/6.
The first orthogonal demodulator 431 includes a first orthogonal code generator for generating a first orthogonal code according to the orthogonal code number and length signals Wno and Wlength, output from the decision block 213. When connected to the selector 420, the first orthogonal demodulator 431 generates the first orthogonal code according to the orthogonal code number and length signals Wno and Wlength and multiplies the despread data by the first orthogonal code to output a first orthogonal demodulation signal. Here, it is assumed that a Walsh code is used for the orthogonal code and a Walsh code of length 256 is used for the data encoded at the 1/3 coding rate. A first signal demapping part 441 demaps the 4-level signal output from the first orthogonal demodulator 431 into binary data by converting data “+1” to “0” and data “−1” to “1”.
The second orthogonal demodulator 432 includes a second orthogonal code generator for generating a second orthogonal code according to the orthogonal code number and length signals Wno and Wlength output from the decision block 213. When connected to the selector 420, the second orthogonal demodulator 432 generates the second orthogonal code according to the orthogonal code number and length signals Wno and Wlength and multiplies the despread data by the second orthogonal code to output a second orthogonal demodulation signal. Here, it is assumed that a Walsh code is used for the orthogonal code and a Walsh code of length 128 is used for the data encoded at the 1/6 coding rate. A second signal demapping part 442 demaps the 4-level signal output from the second orthogonal demodulator 432 into binary data by converting data “+1” to “0” and data “−1” to “1”.
Table 2G shows the channel assignment message for ASSIGN_MODE=“101”,
MSG_TYPE(“00000100”)
MSG_TYPE(“00001000”)
if ASSIGN_MODE=“000”, the additional record fields shall be:
if ASSIGN_MODE=“001”, the additional record fields shall be:
if ASSIGN_MODE=“010”, the additional record fields shall be:
if ASSIGN_MODE=“011”, the additional record fields shall be:
if ASSIGN_MODE=“100”, the additional record fields shall be:
if ASSIGN_MODE=“101”, the additional record fields shall be:
MSG_TYPE(“00010010”)
The term “rate” used in connection with FIGS. 7A, 7B and 8 refers to the coding rate and/or the length of the orthogonal code. A “first rate change condition” means a condition for switching from the higher rate to the lower rate, and a “second rate change condition” means a condition for switching from the lower rate to the higher rate. For example, the first rate change condition for changing the higher rate to the lower rate means that the channel environment is changed from, for example, a state where the 1/3 coding rate and the orthogonal code of length 256 are used to a state where the 1/6 coding rate and the orthogonal code of length 128 are used. Likewise, the second rate change condition for changing the lower rate to the higher rate means that the channel environment is changed from, for example, a state where the 1/6 coding rate and the orthogonal code of length 128 are used to a state where the 1/3 coding rate and the orthogonal code of length 256 are used. In the present embodiment, when the higher coding rate is used, the longer orthogonal code is assigned, and when the lower coding rate is used, the shorter orthogonal code is assigned, to maintain a constant data rate.
A first demultiplexer 1011 demultiplexes data output from the first mixer 341 to the respective carriers in sequence. Signal mapping parts 1021-1023 map levels of the binary data output from the first demultiplexer 1011 by converting data “0” to “+1” and data “1” to “−1”. Orthogonal modulators 1031-1033, in the same number as that of the carriers, each include a first orthogonal code generator (not shown) which generate a first orthogonal code for orthogonally modulating the first encoded data according to the orthogonal code number and length Wno and Wlength output from the decision block 213. The orthogonal modulators 1031-1033 multiply the first orthogonal code generated according to the orthogonal code number and length Wno and Wlength by the data output from the signal mapping parts 1021-1023, respectively, to generate a first orthogonal modulation signal. Here, it is assumed that the Walsh code is used for the orthogonal code and a Walsh code of length 256 is used for the data encoded at the first coding rate of 1/3.
A second demultiplexer 1012 demultiplexes data output from the second mixer 342 to the respective carriers in sequence. Signal mapping parts 1026-1028 map levels of the binary data output from the second demultiplexer 1012 by converting data “0” to “+1” and data “1” to “−1”. Orthogonal modulators 1036-1038, in the same number as that of the carriers, each include a second orthogonal code generators (not shown) which generate a second orthogonal code for orthogonally modulating the second encoded data according to the orthogonal code number and length Wno and Wlength output from the decision block 213. The orthogonal modulators 1036-1038 multiply the second orthogonal code generated according to the orthogonal code number and length Wno and Wlength by the data output from the signal mapping parts 1021-1023, respectively, to generate second orthogonal modulation signals. Here, it is assumed that the Walsh code is used for the orthogonal code and a Walsh code of length 128 is used for the data encoded at the second coding rate of 1/6.
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