Device and method for generating and distributing coded symbols in a CDMA communication system
First Claim
1. A channel transmission device for use in a code division multiple access (CDMA) communication system using at least two carriers, comprising:
- a channel encoder for encoding channel data to be transmitted as symbols at a predetermined coding rate;
a channel controller for generating a symbol distribution signal according to a predetermined symbol deleting matrix pattern, wherein the symbol deleting matrix pattern is constructed to distribute the symbols to the at least two carriers with a minimum performance degradation; and
a symbol distributer for receiving the symbols and distributing said received symbols to the at least two carriers according to the symbol distribution signal.
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Accused Products
Abstract
A device and method for generating and distributing convolutional codes such that performance degradation due to a bad link environment may be minimized during channel decoding in a CDMA communication system. The convolutional encoder encodes transmission data at a coding rate of R=1/6 and can be used for a channel encoder. Such a channel encoder can be used in both a DS-CDMA communication system and a multicarrier CDMA communication system. When the channel encoder is used in the multicarrier CDMA communication system, the symbols outputted from multiple constituent encoders for the channel encoder are distributed to multiple carrier channels according to a predetermined rule, and the constituent encoders for the channel encoder can minimize the performance degradation of the overall channel encoder even though an output of a particular constituent encoder is completely off at the transmission channel.
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Citations
15 Claims
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1. A channel transmission device for use in a code division multiple access (CDMA) communication system using at least two carriers, comprising:
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a channel encoder for encoding channel data to be transmitted as symbols at a predetermined coding rate;
a channel controller for generating a symbol distribution signal according to a predetermined symbol deleting matrix pattern, wherein the symbol deleting matrix pattern is constructed to distribute the symbols to the at least two carriers with a minimum performance degradation; and
a symbol distributer for receiving the symbols and distributing said received symbols to the at least two carriers according to the symbol distribution signal. - View Dependent Claims (2, 3, 4)
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4. The channel transmission device as claimed in claim 1, wherein the symbol distributer comprises:
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a first selector for sequentially multiplexing the received symbols; and
a second selector for distributing the multiplexed symbols to the at least two carriers according to the symbol distribution signal.
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5. A channel transmission device for use in a multicarrier code division multiple access (CDMA) communication system using at least two carriers, comprising:
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a channel encoder for encoding channel data to be transmitted as symbols at a predetermined coding rate;
a symbol distributer for receiving the symbols and distributing received symbols to the at least two carriers according to a predetermined symbol deleting matrix pattern, wherein the symbol deleting matrix pattern is constructed to distribute the symbols to the at least two carriers with minimum degradation;
a channel interleaver for channel interleaving the distributed symbols;
a demultiplexer for distributing the interleaved symbols to the carriers;
a plurality of orthogonal modulators for generating orthogonally modulated signals by multiplying the distributed interleaved symbols by orthogonal codes for the corresponding channels;
a plurality of spreaders for receiving the orthogonally modulated signals and generating spread signals by multiplying the received orthogonally modulated signals by a spreading code; and
a plurality of transmitters for receiving the spread signals and transmitting the received spread signals using the at least two carriers. - View Dependent Claims (6, 7, 8)
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8. The channel transmission device as claimed in claim 5, wherein the symbol distributer comprises:
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a first selector for sequentially multiplexing the received symbols; and
a second selector for distributing the multiplexed symbols to the at least two carriers according to the symbol distribution signal.
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9. A channel transmission method for use in a CDMA communication system using at least two carriers, comprising the steps of:
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encoding channel data to be transmitted into symbols at a predetermined coding rate; and
distributing the symbols to the at least two carriers according to a predetermined symbol deleting matrix pattern, wherein the symbol deleting matrix pattern is constructed to distribute the symbols to the at least two carriers with minimum performance degradation. - View Dependent Claims (10, 11)
sequentially multiplexing the received symbols; and
distributing the multiplexed symbols to the at least two carriers according to the symbol distribution signal.
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12. A channel encoding device for use in a code division multiple access (CDMA) system comprising:
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a plurality of delays for delaying an input data bit to generate first to eight delayed data bits;
a first operator for exclusively ORing the input data bit and the third, fifth, sixth, seventh and eighth delayed data bits to generate a first symbol;
a second operator for exclusively ORing the input data bit and the first, second, third, fifth, sixth and eighth delayed data bits to generate a second symbol;
a third operator for exclusively ORing the input data bit and the second, third, fifth and eighth delayed data bits to generate a third symbol;
a fourth operator for exclusively ORing the input data bit and the first, fourth, fifth, sixth, seventh and eighth delayed data bits to generate a fourth symbol;
a fifth operator for exclusively ORing the input data bit and the first, fourth, sixth and eighth delayed data bits to generate a fifth symbol; and
a sixth operator for exclusively ORing the input data bit and the first, second, fourth, sixth, seventh and eighth delayed data bits to generate a sixth symbol.
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13. A channel transmission device for use in a code division multiple access (CDMA) communication system, comprising:
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a channel encoder including, a plurality of delays for delaying an input data bit to generate first to eight delayed data bits;
a first operator for exclusively ORing the input data bit and the third, fifth, sixth, seventh and eighth delayed data bits to generate a first symbol;
a second operator for exclusively ORing the input data bit and the first, second, third, fifth, sixth and eighth delayed data bits to generate a second symbol;
a third operator for exclusively ORing the input data bit and the second, third, fifth and eighth delayed data bits to generate a third symbol;
a fourth operator for exclusively ORing the input data bit and the first, fourth, fifth, sixth, seventh and eighth delayed data bits to generate a fourth symbol;
a fifth operator for exclusively ORing the input data bit and the first, fourth, sixth and eighth delayed data bits to generate a fifth symbol;
a sixth operator for exclusively ORing the input data bit and the first, second, fourth, sixth, seventh and eighth delayed data bits to generate a sixth symbol;
a channel interleaver for receiving the symbols and channel interleaving the received symbols;
an orthogonal modulator for generating an orthogonally modulated signal by multiplying the distributed symbols by an orthogonal code for the channel; and
a spreader for generating a spread signal by multiplying the orthogonally modulated signal by a spreading code. - View Dependent Claims (14)
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15. A channel encoding method for use in a CDMA communication system, comprising the steps of:
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delaying a received input data bit to generate first to eight delayed data bits;
exclusively ORing the received input data bit and the third, fifth, sixth, seventh and eighth delayed data bits to generate a first symbol;
exclusively ORing the received input data bit and the first, second, third, fifth, sixth and eighth delayed data bits to generate a second symbol;
exclusively ORing the received input data bit and the second, third, fifth and eighth delayed data bits to generate a third symbol;
exclusively ORing the received input data bit and the first, fourth, fifth, sixth, seventh and eighth delayed data bits to generate a fourth symbol;
exclusively ORing the received input data bit and the first, fourth, sixth and eighth delayed data bits to generate a fifth symbol; and
exclusively ORing the received input data bit and the first, second, fourth, sixth, seventh and eighth delayed data bits to generate a sixth symbol.
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Specification