Cyclic training sequence generating method, communication system and communication method
AssigneeNtt Docomo, Inc.
InventorsZhongshan Zhang, Hidetoshi Kayama
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Abstract
A method for generating a cyclic training sequence comprises the following steps: generating randomly the first information block with the length N, copying the last L samples of the first information block to the beginning of the block as the first CP, generating the second information block with the length N by using the first information block of the training symbol in a circle manner in which the last d samples of the first information block are shifted to the position before the rest (N−d) samples and the N samples thus rearranged forms the second information block, copying the last L samples of the second information block to the beginning of the block as the second CP to form the integrated cyclic training sequence.
Claims6
A method for generating a cyclic training sequence with a first training symbol and a second training symbol sequentially, the first training symbol including a first CP and a first information block sequentially and the second training symbol including a second CP and a second information block sequentially, the method comprises:
- generating randomly the first information block with a length N by a first training symbol information block generator, wherein N is a natural number;
- copying the last L samples of the first information block to the beginning of the block as the first CP by a first CP generator, wherein L is a natural number less than N;
- generating the second information block with the length N by the first information block of the first training symbol in a circle manner in which the last d samples of the first information block are shifted to the position before the rest (N−d) samples and the N samples thus rearranged forms the second information block by a second training symbol information block generator, wherein the corresponding relation between the first and second information blocks is the structure characteristic of the cyclic training sequence, and d is 0 or any natural number less than N;
- and
- copying the last L samples of the second information block to the beginning of the block as the second CP to form the integrated cyclic training sequence by a second CP generator.
A communication system comprising:
- a terminal including a training sequence generator and a data symbol adder, wherein the training sequence generator generates a cyclic training sequence corresponding to the structure characteristic of the specific cyclic training sequence allocated by the base station, and the data symbol adder adds some data symbols and to create an integrated frame accordingly which is to be transmitted as a transmitting signal;
- and
- a base station to perform timing synchronizing and carrier frequency offset for the received signal with the specific cyclic training sequence and to recover the transmitting signal after demodulation and decoding;
- wherein the training sequence generator includes:
- an encoder to randomly encode the data;
- a data modulator to modulate the signal outputted from the encoder;
- a first training symbol information block generator to generate the first information block with a length N of the specific cyclic training sequence according to the demodulated code outputted from the data modulator, where N is a natural number;
- a first CP generator to copy the last L samples of the first information block to the beginning of the block as CP according to the first information block generated by the first training symbol information block generator, where L is a natural number less than N;
- a second training symbol information block generator to shift the last d samples of the first information block to the position before the rest (N−d) samples and to form the second information block by the N samples rearranged according to the structure characteristics of the specific cyclic training sequence and d is 0 or any number less than N;
- and
- a second CP generator to copy the last L samples of the second information block to the beginning of the block as CP according to the second information block generated by the second training symbol information block generator.
Dependencies are inferred from the claim text.