Terminal of a code division multiple access cellular communication system, and a transmit and receive data processing method thereof

Claim 1

A terminal of a code division multiple access digital cellular communication system, comprising: a demodulating unit for performing 4-bit soft decision of a signal having a variable data rate received from a base station, thereby to output demodulating data therefrom; a speech encoding unit for encoding speech data for transmitting; a digital signal processing unit for de-interleaving said demodulating data according to an interrupt signal generated every time unit previously set, determining a bit rate by utilizing said de-interleaved data and Viterbi-decoding said de-interleaved data, thereby to output said Viterbi-decoded data as first data therefrom, and repeatedly channel-encoding and interleaving data outputted from said speech encoding unit, thereby to output said interleaved data as second data therefrom; a first buffer for temporarily buffering said data demodulated by said demodulating unit and then inputting said buffered data to said digital signal processing unit; a second buffer for temporarily buffering data encoded by said speech encoding unit and then inputting said buffered data to said digital signal processing unit; a speech decoding unit for speech-decoding said first data, thereby to restore said speech-decoded data as speech information; and a modulating unit for modulating said second data for transmitting said modulated data to said base station.

Claim 5

A method for processing transmit and receive data in a terminal of a code division multiple access cellular communication system, comprising the steps of: performing 4-bit soft decision for a signal having a variable data rate received from a base station, thereby to demodulate said 4-bit soft decision signal; de-interleaving said demodulated signal, thereby to arrange said de-interleaved signal in a sequence of initial transmit data; repeatedly counting respective symbols of said de-interleaved data as many times previously set and comparing said counted symbols with a reference value previously set, thereby to determine a receive data bit rate; Viterbi-decoding data recorded at said determined data bit rate, restoring said Viterbi decoded data as speech information; repeatedly channel-encoding and interleaving speech-encoded data to be transmitted to said base station; and modulating said interleaved data as data for transmitting, wherein said de-interleaving, said receive data bit rate determining, said Viterbi decoding, said encoding, and said interleaving are repeatedly and sequentially carried out within a period of around 20 msec.

Claim 6

A method for processing transmit and receive data in a terminal of a code division multiple access cellular communication system, comprising the steps of: performing 4-bit soft decision for a signal having a variable data rate received from a base station, thereby to demodulate said 4-bit soft decision signal; de-interleaving said demodulated signal, thereby to arrange said de-interleaved signal in a sequence of initial transmit data; repeatedly counting respective symbols of said de-interleaved data as many times previously set and comparing said counted symbols with a reference value previously set, thereby to determine a receive data bit rate; Viterbi-decoding data recorded at said determined data bit rate, restoring said Viterbi decoded data as speech information; repeatedly channel-encoding and interleaving speech-encoded data to be transmitted to said base station; and modulating said interleaved data as data for transmitting, wherein said de-interleaving, said receive data bit rate determining, said Viterbi decoding, said encoding, and said interleaving are repeatedly and sequentially carried out within a period of around 20 msec.

Claim 7

A method for processing transmit and receive data in a terminal of a code division multiple access cellular communication system, comprising the steps of: performing 4-bit soft decision for a signal having a variable data rate received from a base station, thereby to demodulate said 4-bit soft decision signal; de-interleaving said demodulated signal, thereby to arrange said de-interleaved signal in a sequence of initial transmit data; repeatedly counting respective symbols of said de-interleaved data as many times previously set and comparing said counted symbols with a reference value previously set thereby to determine a receive data bit rate; Viterbi-decoding data recorded at said determined data bit rate, restoring said Viterbi decoded data as speech information; repeatedly channel-encoding and interleaving speech-encoded data to be transmitted to said base station; and modulating said interleaved data as data for transmitting wherein said receive data bit rate determining is comprised of: checking an equal state of respective 8 symbols of receive data in a state of initializing a count and a repeat time, thereby to detect a transmit error; increasing said count and said repeat time by 1 in said equal state of respective 8 symbols, and comparing a counting result value with a 1200 bps reference value previously set in the case that said repeat time is 48, so that said counting result value is determined to be a 1200 bps receive data bit rate if said counting result value is larger than said 1200 bps reference value; checking an equal state of respective 4 symbols of said receive data in said state of initializing said count and said repeat time, thereby to detect a transmit error; increasing said count and said repeat time by 1 in said equal state of respective 4 symbols, and comparing a counting result value with a 2400 bps reference value previously set in the case that said repeat time is 96, so that said counting result value is determined to be a 2400 bps receive data bit rate if said counting result value is larger than said 2400 bps reference value; checking an equal state of respective 2 symbols of said receive data in said state of initializing said count and said repeat time, thereby to detect a transmit error; and increasing said count and said repeat time by 1 in said equal state of respective 2 symbols, and comparing a counting result value with a 4800 bps reference value previously set in the case that said repeat time is 192, so that said counting result value is determined to be a 4800 bps receive data bit rate if said counting result value is larger than said 4800 bps reference value said counting result value is a 9600 bps receive bit rate if said counting result value is less than a 4800 bps reference value.

Claim 8

A method for processing transmit and receive data in a terminal of a code division multiple access cellular communication system, comprising the steps of: performing 4-bit soft decision for a signal having a variable data rate received from a base station, thereby to demodulate said 4-bit soft decision signal; de-interleaving said demodulated signal, thereby to arrange said de-interleaved signal in a sequence of initial transmit data; repeatedly counting respective symbols of said de-interleaved data as many times previously set and comparing said counted symbols with a reference value previously set thereby to determine a receive data bit rate; Viterbi-decoding data recorded at said determined data bit rate, restoring said Viterbi decoded data as speech information; repeatedly channel-encoding and interleaving speech-encoded data to be transmitted to said base station; and modulating said interleaved data as data for transmitting wherein said receive data bit rate determining is comprised of: checking an equal state of respective 8 symbols of receive data in a state of initializing a count and a repeat time, thereby to detect a transmit error; increasing said count and said repeat time by 1 in said equal state of respective 8 symbols, and comparing a counting result value with a 1200 bps reference value previously set in the case that said repeat time is 48, so that said counting result value is determined to be a 1200 bps receive data bit rate if said counting result value is larger than said 1200 bps reference value; checking an equal state of respective 4 symbols of said receive data in said state of initializing said count and said repeat time, thereby to detect a transmit error; increasing said count and said repeat time by 1 in said equal state of respective 4 symbols, and comparing a counting result value with a 2400 bps reference value previously set in the case that said repeat time is 96, so that said counting result value is determined to be a 2400 bps receive data bit rate if said counting result value is larger than said 2400 bps reference value; checking an equal state of respective 2 symbols of said receive data in said state of initializing said count and said repeat time, thereby to detect a transmit error; and increasing said count and said repeat time by 1 in said equal state of respective 2 symbols, and comparing a counting result value with a 4800 bps reference value previously set in the case that said repeat time is 192, so that said counting result value is determined to be a 4800 bps receive data bit rate if said counting result value is larger than said 4800 bps reference value said counting result value is a 9600 bps receive bit rate if said counting result value is less than a 4800 bps reference value.