Mobile communication terminal and transmission-bit-rate detection method

A transmission-bit-rate detection method for detecting a transmission bit rate from a received encoded data, the method comprising:

• estimating the transmission bit rate and outputting an estimated transmission-bit-rate of the received encoded data;
• repeatedly decoding the received encoded data at the estimated transmission bit rate until detecting that the estimated transmission bit rate is correct;
• outputting a decoded data at the correct estimated transmission bit rate;
• and
• re-encoding the decoded data and outputting re-encoded data.

A communication terminal that receives an encoded data transmitted from a base station an detects a transmission bit rate selected at the base station, comprising:

• a demodulator that receive and demodulates the encoded data;
• a rate estimation unit that estimates a transmission bit rate and outputs an estimated transmission bit rate of the receive encoded data;
• a decoding unit that decodes the received encoded data at the estimated transmission bit rate and outputs a first decode data;
• and
• a re-encoding unit that re-encodes the first decoded data and outputs re-encoded data,
• wherein the decoding unit repeatedly decodes the received encoded data until the rate estimation unit detects a correct estimated transmission bit rate, and thereby the decoding unit outputs a second decoded data at the correct estimated transmission bit rate.

An LSI circuit for receiving encoded data transmitted from a base station and detecting a transmission bit rate selected at the base station, the LSI circuit comprising:

• a rate estimation unit that estimates a transmission bit rate and outputs an estimated transmission bit rate of the receive encoded data;
• a decoding unit that repeatedly decodes the received encoded data at the estimated transmission bit rate until the rate estimation unit detects a correct estimated transmission bit rate, and thereby outputs a decoded data at the correct estimated transmission bit rate;
• and
• a re-encoding unit that re-encodes the decoded data and outputs re-encoded data.

An LSI circuit for receiving encoded data transmitted from a base station and detecting a transmission bit rate selected at the base station, the LSI circuit comprising:

• a rate estimation unit that estimates a transmission bit rate and outputs an estimated transmission bit rate of the receive encoded data;
• a decoding unit that decodes the received encoded data at the estimated transmission bit rate and outputs a first decoded data;
• and
• a re-encoding unit that re-encodes the first decoded data and outputs re-encoded data,
• wherein the decoding unit repeatedly decodes the received encoded data until the rate estimation unit detects a correct estimated transmission bit rate, and thereby the decoding unit outputs a second decoded data at the correct estimated transmission bit rate.

A transmission-bit-rate detection method for detecting a transmission bit rate from a received encoded data, the method comprising:

• estimating the transmission bit rate and outputting an estimated transmission bit rate of the received encoded data;
• decoding the received encoded data at the estimated transmission bit rate and outputting a first decoded data;
• and
• re-encoding the first decoded data and outputting re-encoded data,
• wherein the received encoded data is repeatedly decoded until the estimated transmission bit rate is detected a correct and wherein the second decoded data is outputted at the correct estimated transmission bit rate.

A mobile communication terminal which receives an encoded data transmitted from a base station an detects a transmission bit rate selected at the base station, the communication terminal comprising:

• a rate estimation unit that estimates a transmission bit rate and outputs an estimated transmission bit rate;
• a decoding unit that decodes the received encoded data at the estimated transmission bit rate and outputs a decoded data;
• and
• a re-encoding unit that re-encodes the decoded data and outputs re-encoded data;
• wherein the decoding unit outputs the decoded data on the basis of the re-encoded data,
• wherein said decoding unit comprises:
• an operation unit that calculates branch metrics for executing a Viterbi decoding of the received encoded data;
• and
• a Viterbi decoder that executes the Viterbi decoding at the estimated transmission bit rate based on the branch metrics,
• wherein said rate estimation unit comprises a first part which determines the estimated transmission bit rate as a proper transmission bit rate when the estimated transmission bit rate is detected to be correct and change the estimated transmission bit rate when the estimated transmission bit rate is detected not to be correct, and a second part which makes said decoding unit repeatedly to execute said Viterbi decoding until the estimated transmission bit rate is detected to be correct,
• wherein said rate estimation unit multiplies or divides the estimated transmission bit rate by two when the estimated transmission bit rate is detected not to be correct and makes said decoding unit repeatedly to execute said Viterbi decoding until a changed estimated transmission bit rate is detected to be correct.

A transmission-bit-rate detection method for detecting a transmission bit rate from a received encoded data, the method comprising:

• estimating a transmission it rate and outputting an estimated transmission-bit-rate;
• decoding the received encoded data at the estimated transmission bit rate;
• outputting a decoded data;
• and
• re-encoding the decoded data and outputting re-encoded data,
• wherein the decoding outputs the decoded data on the bases of the re-encoded data,
• wherein the decoding comprises:
• calculating branch metrics for executing a Viterbi decoding of said received encoded data;
• and
• executing said Viterbi decoding at the estimated transmission bit rate based on said branch metrics,
• wherein said estimating comprises:
• determining the estimated transmission bit rate as a proper transmission bit rate when the estimated transmission it rate is detected to be correct;
• changing the estimated transmission bit rate when the estimated transmission bit rate is detected not to be correct;
• and
• performing said decoding repeatedly to execute said Viterbi decoding until the estimated transmission bit rate is detected to be correct,
• wherein the changing multi lies or divides the estimated transmission bit rate by two when the estimated transmission it rate is detected not to be correct and performs said decoding repeatedly to execute said Viterbi decoding until a changed estimated transmission bit rate is detected to be correct.

A transmission-bit-rate detection method for detecting a transmission bit rate from a received encoded data, comprising:

• estimating the transmission bit rate and outputting an estimated transmission bit rate;
• decoding the received encoded data at the estimated transmission bit rate and outputting a first decoded data;
• and
• re-encoding the first decoded data and outputting re-encoded data,
• wherein the decoding outputs a second decoded data on the basis of the re-encoded data,
• wherein the estimating comprises:
• determining the estimated transmission bit rate as a proper transmission bit rate when the estimated transmission it rate is detected to be correct;
• and
• multiplying or dividing the estimated transmission bit rate by two when the estimated transmission bit rate is detected not to be correct and repeatedly executing a Viterbi decoding until the estimated transmission bit rate is detected to be correct.

A transmission-bit-rate detection method for detecting a transmission bit rate from a received encoded data, comprising:

• estimating the transmission bit rate and outputting an estimated transmission bit rate;
• decoding the received encoded data at the estimated transmission bit rate and outputting a first decoded data;
• and
• re-encoding the first decoded data and outputting re-encoded data,
• wherein the decoding outputs a second decoded data on the basis of the re-encoded data,
• wherein the estimating multiplies or divides the estimated transmission bit rate by two when the estimated transmission it rate is detected not to be correct and repeatedly executes a Viterbi decoding until the estimated transmission bit rate is detected to be correct.