Pilot signal transmission method and radio communication apparatus

Patent metadata

Field	Value
Publication number	US-9735938-B2
Application number	US-201615075346-A
Country	US
Kind code	B2
Filing date	Mar 21, 2016
Priority date	Apr 25, 2006
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

In a radio communication system, transmission of CAZAC sequences as the pilot signal sequences by using code division multiplexing as at least one of user multiplexing schemes, is done by dividing a system band as a frequency band usable in the system into frequency blocks B 1 and B 2 having bandwidths W 1 and W 2 , generating the pilot signals of the frequency blocks B 1 and B 2 with a single carrier, using the pilot signal sequences having sequence lengths L 1 and L 2 corresponding to frequency blocks B 1 and B 2 respectively; and, transmitting the generated pilot signals as the pilot signals corresponding individual users, with multicarriers using an arbitrary number of frequency blocks among the plural frequency blocks.

First claim

What is claimed is:

1. A base station comprising:
a receiver configured to receive, from a user equipment, a first reference signal including a first sequence having a first sequence length corresponding to a first bandwidth assigned for a first single carrier data transmission and a second reference signal including a second sequence having a second sequence length corresponding to a second bandwidth assigned for a second single carrier data transmission; and
a demodulator configured to demodulate a data signal of the first single carrier data transmission by using the received first reference signal and a data signal of the second single carrier data transmission by using the received second reference signal.

2. The base station in accordance with claim 1 , wherein the receiver receives data signals using three or more bandwidths including the first bandwidth and the second bandwidth.

3. The base station in accordance with claim 1 , wherein, the receiver receives data signals using a multi-carrier transmission of a first single carrier data transmission of the first bandwidth and a second single carrier data transmission of the second bandwidth.

4. The base station in accordance with claim 1 wherein, the first bandwidth equals the second bandwidth.

5. The base station in accordance with claim 1 wherein, the first bandwidth is different from the second bandwidth.

6. The base station in accordance with claim 1 wherein, at least one of the first sequence and the second sequence is a CAZAC sequence or a cyclic shifted CAZAC sequence.

7. A communication method by a base station comprising:
receiving, from a user equipment, a first reference signal including a first sequence having a first sequence length corresponding to a first bandwidth assigned for a first single carrier data transmission and a second reference signal including a second sequence having a second sequence length corresponding to a second bandwidth assigned for a second single carrier data transmission, by a receiver implemented in the base station; and
demodulating, by a demodulator implemented in the base station, a data signal of the first single carrier data transmission by using the received first reference signal and a data signal of the second single carrier data transmission by using the received second reference signal.

8. The communication method in accordance with claim 7 , wherein receiving data signals using three or more bandwidths including the first bandwidth and the second bandwidth.

9. The communication method in accordance with claim 7 , wherein, receiving data signals using a multi-carrier transmission of a first single carrier transmission of the first bandwidth and a second single carrier transmission of the second bandwidth.

10. The communication method in accordance with claim 7 , wherein, the first bandwidth equals the second bandwidth.

11. The communication method in accordance with claim 7 , the first bandwidth is different from the second bandwidth.

12. The communication method in accordance with claim 7 , wherein, at least one of the first sequence and the second sequence is a CAZAC sequence or a cyclic shifted CAZAC sequence.

Assignees

• Nec Corp

Inventors

• Inoue Takamichi
• Kakura Yoshikazu

Classifications

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title

• H04B2201/70701

  featuring pilot assisted reception · CPC title

• H04W28/20

  Negotiating bandwidth · CPC title

• H04J13/0059

  CAZAC [constant-amplitude and zero auto-correlation] · CPC title