Forward link device of multicarrier communication system and method for realizing the same

• US 6,993,062 B1
• Filed: 11/17/1998
• Issued: 01/31/2006
• Est. Priority Date: 11/17/1997
• Status: Expired due to Term

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Yoon, Soon-Young, Kang, Hee-Won, Kim, Young-Ky, Ahn, Jae-Min, Kong, Seung-Hyun, Yie, Kwang-Wook
• Primary Examiner(s): Ghayour, Mohammed
• Assistant Examiner(s): Kumar, Pankaj
• Application Number:
  US09/193,213
• Time in Patent Office: 2,632 Days
• Field of Search: 375/130, 375/140, 375/141, 375/146, 375/259, 375/295, 375/377, 370/335, 370/342, 341/173
• US Class Current: 375/130
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0068 by puncturing
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 5/0021 in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
• CPC Class Codes: H04L 5/0028 Variable division signaling therefor H04L5/0092
• CPC Class Codes: H04L 5/0033 each allocating device acting autonomously, i.e. without negotiation with other allocating devices
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority

Abstract

A forward link device of a multicarrier CDMA communication system with an overlay scheme in which a multicarrier system and an IS-95 system share same frequency bands. In the forward link device, four encoders encode input data of corresponding rates with a 1/3 coding rate, respectively. A first repeater repeats two times full rate symbols output from the first encoder, and second to fourth repeaters repeat symbols output from the second to fourth encoders, respectively, according to a predetermined number of times, to match the number of corresponding output symbols to the number of full rate symbols. First to fourth interleavers interleave the symbols output from the first to fourth repeaters, respectively, to uniformly distribute the symbols of the same data bit to the carriers.

Claims

1. A method for realizing a forward link of a CDMA (Code Division Multiple Access) communication system which outputs multicarrier transmission signals on each channel of the communication system, comprising the steps of:

repeating full rate symbols such that a number of encoded symbols for each input data bit is at least twice the number of carriers;

repeating symbols of other rates to match a number of the symbols to the number of the full rate symbols; and

interleaving the repeated symbols such that the encoded symbols of the same input data bit are uniformly distributed among the carriers.

8. The method as claimed in claim 1, wherein said step of repeating encoded symbols of other rates is performed a predetermined number of times.

2. A method for realizing a forward link of a CDMA (Code Division Multiple Access) communication system which outputs multicarrier transmission signals on each channel of the communication system, comprising the steps of:

encoding transmission data of at least two different rates with a predetermined coding rate to generate symbols of respective rates;

repeating full rate symbols such that a number of encoded symbols for each input data bit are at least twice the number of carriers, and repeating symbols of the other rates such that the symbols of the other rates are equal in number to the full rate symbols; and

interleaving the repeated symbols such that the encoded symbols of the same input data bit are uniformly distributed among the carriers.

3. A method for realizing a forward link of a CDMA (Code Division Multiple Access) communication system which outputs multicarrier transmission signals on each channel of the communication system, comprising the steps of:

encoding transmission data of a plurality of rates with a predetermined coding rate such that a number of full rate encoded symbols for each input data bit is at least twice a number of carriers;

repeating symbols such that the symbols of each rate is equal in number to the full rate symbols; and

interleaving the repeated symbols such that the encoded symbols of the same input data bit are uniformly distributed among the carriers.

4. A forward link device of a CDMA communication system which outputs multicarrier transmission signals on each channel of the communication system, the forward link comprising:

a plurality of encoders for encoding input data of corresponding rates into symbols with corresponding coding rates, respectively;

a plurality of repeaters including a first repeater for repeating full rate symbols and other repeaters for repeating symbols of other rates, wherein the first repeater repeats the full rate symbols such that the number of the full rate encoded symbols for each input data bit is at least twice the number of carriers, wherein the other repeaters repeat the symbols output from the corresponding encoders to be equal in number to the full rate symbols; and

a plurality of interleavers for interleaving the repeated symbols to uniformly distribute the encoded symbols of the same input data bit output from the repeaters among the carriers.

5. A forward link device of a CDMA communication system which outputs multicarrier transmission signals on each channel of the communication system, the forward link comprising:

encoders for encoding input data of corresponding rates into symbols with a corresponding coding rate, respectively, the coding rate being determined such that the number of full rate encoded symbols for each input data bit is at least twice the number of carriers;

repeaters for repeating symbols output from the corresponding encoders to be equal in number to the full rate symbols; and

interleavers for uniformly distributing the repeated symbols of the same input data bit among the carriers.

9. The apparatus as claimed in claim 5, wherein a number of said repeaters is less than a number of said encoders.

6. A forward link device of a multicarrier CDMA communication system outputting multicarrier transmission signals on each channel of the communication system by overlaying three carriers extending over 5 MHz on same frequency bands as an IS-95 system, the forward link comprising:

first to fourth encoders for encoding input data of corresponding rates with a 1/3 coding rate, respectively;

a plurality of repeaters including a first repeater for repeating each input data two times full rate symbols output from the first encoder and second to fourth repeaters for repeating each of the input symbols output from the second to fourth encoders, respectively, to match the number of corresponding output symbols to the number of full rate symbols; and

first to fourth interleavers for interleaving the repeated symbols output from the first to fourth repeaters, respectively, to uniformly distribute the encoded symbols of the same input data bit among the carriers.

7. A forward link device of a multicarrier CDMA communication system outputting multicarrier transmission signals on each channel of the communication system by overlaying three carriers extending over 5 MHz on same frequency bands as an IS-95 system, the forward link comprising:

first to fourth encoders for encoding input data of first to fourth rates with a 1/6 coding rate, respectively;

first to fourth for repeating symbols output from the second to fourth encoders, respectively, to match the number of corresponding output symbols to the number of full rate symbols output from the first encoder; and

first to fourth interleavers for interleaving the repeated symbols output from the first encoder and the second to fourth repeaters, respectively, to uniformly distribute the encoded symbols for each input data bit among the carriers.

10. A base station system transmitting information data to a mobile station through multiple transmitting carrier frequencies on each channel of the communication system, the system comprising:

a channel encoder for encoding the information data to a plurality of encoded symbols;

an interleaver, coupled to the channel encoder, for interleaving the encoded symbols; and

a demultiplexer, coupled to the interleaver, for distributing the encoded symbols output from the interleaver to the multiple transmitting carrier frequencies, wherein encoded symbols corresponding to each information bit are uniformly distributed among each of the multiple transmitting carrier frequencies.