Spread spectrum communication system apparatus

• US 7,283,581 B2
• Filed: 05/30/2002
• Issued: 10/16/2007
• Est. Priority Date: 06/01/2001
• Status: Expired due to Fees

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Itoh, Katsutoshi
• Primary Examiner(s): Kumar; Pankaj
• Application Number:
  US10/343,466
• Publication Number:
  US 20040037351A1
• Time in Patent Office: 1,965 Days
• Field of Search: 375/147, 375/140, 375/130, 375/377
• US Class Current: 375/147
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04B 1/7097 Interference-related aspects
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 2201/70703 using multiple or variable rates
• CPC Class Codes: H04B 2201/70707 Efficiency-related aspects
• CPC Class Codes: H04B 2201/709709 Methods of preventing interference
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0006 by adapting the transmission format
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0036 arrangements specific to the receiver
• CPC Class Codes: H04L 27/0012 arrangements for identifying the type of modulation

Abstract

A receiving apparatus eliminating the need for performing at all times a function provided for a mode that is most susceptible to deterioration in accuracy in adaptive modulation communication. In a spread spectrum communication system according to the present invention, a control unit reads a demodulating method from a control signal specifying the demodulating method, and on the basis of the read demodulating method, the control unit controls a sampling rate of an A/D conversion unit and a despreading unit, a number of pilot symbols used by a propagation path estimating unit, and a number of pilot symbols despread by the despreading unit. Thereby, when the demodulating method is other than 64-QAM, the sampling rate and the like adjusted to QPSK or 16-QAM can be set.

Claims

1. A despreading device receiving a spread signal to be received, said despreading device comprising:

receiving means for receiving said signal to be received that has communication data and a control signal specifying a demodulating method;

despreading means for despreading the received signal on the basis of a sampling rate and then outputting said control signal and the communication data;

sampling rate supplying means for supplying said sampling rate to said despreading means;

data demodulating means for demodulating the communication data;

control means for controlling said sampling rate and a demodulating method of the demodulating means on the basis of said control signal; and

output means for outputting the sampling rate.

2. A propagation path estimating device receiving a spread signal to be received, said propagation path estimating device comprising:

receiving means for receiving said signal to be received that has communication data, a pilot signal and a control signal specifying a demodulating method;

despreading means for despreading the received signal, and then outputting said pilot signal and said control signal and the communication data;

propagation path estimating means for obtaining an amount of phase rotation of said received signal on the basis of said pilot signal;

data demodulating means for demodulating the communication data;

control means for controlling a demodulating method of the demodulating means and a length of said pilot signal used by said propagation path estimating means on the basis of said control signal; and

output means for outputting the pilot signal.

3. A despreading device receiving a spread signal to be received, said despreading device comprising:

receiving means for receiving said signal to be received that has communication data, a pilot signal and a control signal specifying a demodulating method;

despreading means for despreading the received signal, and then outputting the communication data, said pilot signal and said control signal;

control means for controlling a demodulating method of the demodulating means and a length of said pilot signal despread by said despreading means on the basis of said control signal; and

output means for outputting the pilot signal.

4. A receiving apparatus for receiving a spread signal to be received, said receiving apparatus comprising:

receiving means for receiving said signal to be received that has communication data and a control signal specifying a demodulating method;

despreading means for despreading the received signal on the basis of a sampling rate, and then outputting said communication data and said control signal;

sampling rate supplying means for supplying said sampling rate to said despreading means;

data demodulating means for demodulating said communication data;

control means for controlling said sampling rate and a demodulating method of said data demodulating means on the basis of said control signal; and

output means for outputting the sampling rate.

5. A receiving apparatus for receiving a spread signal to be received, said receiving apparatus comprising:

receiving means for receiving said signal to be received that has communication data, a pilot signal, and a control signal specifying a demodulating method;

despreading means for despreading the received signal, and then outputting said communication data, said pilot signal, and said control signal;

propagation path estimating means for obtaining an amount of phase rotation of said received signal on the basis of said pilot signal;

data demodulating means for demodulating said communication data on the basis of said amount of phase rotation;

control means for controlling length of said pilot signal used by said propagation path estimating means and a demodulating method of said data demodulating means on the basis of said control signal; and

output means for outputting the pilot signal.

6. A receiving apparatus for receiving a spread signal to be received, said receiving apparatus comprising:

receiving means for receiving said signal to be received that has communication data, a pilot signal, and a control signal specifying a demodulating method;

despreading means for despreading the received signal, and then outputting said communication data, said pilot signal, and said control signal;

data demodulating means for demodulating said communication data;

control means for controlling length of said pilot signal despread by said despreading means and a demodulating method of said data demodulating means on the basis of said control signal; and

output means for outputting the pilot signal.