JP2013219719A - Wireless receiver of portable wireless communication system and interference suppression method - Google Patents

Abstract

Interference compensation is possible for interference between the same channel and different polarizations received from an adjacent fixed wireless communication system.
In a portable radio station of a portable radio communication system installed in the vicinity of a fixed radio station of a fixed radio communication system, a radio signal having a different first polarization is received on the same reception channel as the fixed radio station. In the radio receiving apparatus for receiving, the second radio signal processing means includes second interference compensation means for outputting, as a reference signal, a reception signal obtained by receiving and processing a radio signal of the second polarization of the reception channel. The radio signal processing means generates a compensation signal corresponding to an interference wave component included in the received signal obtained by receiving and processing the first polarized radio signal of the receiving channel from the reference signal, and the received signal and the compensated signal are generated. First interference compensation means for outputting a demodulated signal in which interference wave components are canceled by addition with equal amplitude and opposite phases is included.
[Selection] Figure 1

Description

  The present invention relates to a portable type that compensates for interference caused by polarization leakage that occurs when a portable radio station of a portable radio communication system is installed in the vicinity of a fixed radio station of a fixed radio communication system. The present invention relates to a radio reception apparatus and an interference suppression method of a radio communication system.

FIG. 3 shows a configuration example of a fixed wireless communication system.
In FIG. 3, in the fixed wireless communication system, a plurality of frequency channels arranged on the frequency axis are assigned to the fixed wireless stations A and B facing each other as a set. In the example shown here, 6 channels are set to 3 groups of low group and high group, channels Ch1 to Ch3 are assigned to transmission of fixed wireless station A (reception of fixed wireless station B), and channels Ch4 to Ch6 are fixed wireless. Assigned to station A reception (transmission of fixed radio station B). Further, the polarizations of the transmission channels Ch1 to Ch3 of the fixed radio station A are interleaved, and the polarizations of the reception channels Ch4 to Ch6 of the fixed radio station A are interleaved.

  Accordingly, the fixed radio station A transmits to the fixed radio station B with the vertical polarization (V) of the channel Ch1, the horizontal polarization (H) of the channel Ch2, and the vertical polarization (V) of the channel Ch3, and the vertical of the channel Ch4. The signal from the fixed radio station B is received with the polarization (V), the horizontal polarization (H) of the channel Ch5, and the vertical polarization (V) of the channel Ch6. Thus, in the fixed wireless communication system, vertical polarization or horizontal polarization is used in all the channels Ch1 to Ch6 allocated in advance.

  On the other hand, a portable wireless communication system is used when a temporary communication line is constructed in the event of a disaster. The portable wireless communication system enables communication by setting up a wireless station between any two points where demand occurs without fixing the installation location of the wireless station and forming a temporary wireless line.

  When a portable radio station of such a portable radio communication system is to be installed in the vicinity of a fixed radio station of an existing fixed radio communication system, vertical polarization or horizontal polarization is used in all frequency channels. Therefore, the polarization of the vacant frequency channel is used.

  FIG. 4 shows assignments and problems of frequency channels and polarization when a fixed wireless communication system and a portable wireless communication system are close to each other.

  In FIG. 4, the polarizations of the channels Ch1 to Ch6 are assigned to the fixed wireless station A and the fixed wireless station B of the fixed wireless communication system in an interleaved manner as in the example shown in FIG. Here, when the portable radio stations C and D of the portable radio communication system are installed in the vicinity of the fixed radio stations A and B of the fixed radio communication system, the transmission channel Ch1 (H) and the reception channel are connected to the portable radio station C. Assign Ch4 (H). At this time, when the portable radio station C receives the transmission signal of the portable radio station D through the reception channel Ch4 (H), the reception channel of the fixed radio station A (transmission channel of the fixed radio station B) Ch4 (V ) Signal becomes an interference wave.

  As an interference compensation technique for such interference, there is a technique for performing interference compensation in a fixed microwave line (for example, Patent Document 1). In this conventional interference compensation technique, an auxiliary antenna for receiving an interference signal is provided in addition to the main antenna for receiving the main signal, a compensation signal is generated from the signal received by the auxiliary antenna, and the main signal and the compensation signal are in reverse phase. In this configuration, interference compensation is performed by combining.

JP 62-233943 A

  The conventional interference compensation technique is for a fixed microwave line. As shown in FIG. 4, a portable radio communication system is arranged in the vicinity of a fixed radio communication system that uses interleaved polarization of frequency channels. When allocating channels and different polarizations, it cannot be applied to interference compensation between the same channel and different polarizations.

  An object of the present invention is to provide a radio reception apparatus and an interference suppression method for a portable radio communication system capable of compensating for interference between the same channel and different polarizations received from an adjacent fixed radio communication system. .

  A first aspect of the present invention is a portable radio station of a portable radio communication system installed in the vicinity of a fixed radio station of a fixed radio communication system, and is a radio having a first polarization different in the same reception channel as the fixed radio station. In a radio reception apparatus of a portable radio communication system for receiving a signal, a first polarization radio signal and a second polarization allocated to the fixed radio station on the same reception channel as the fixed radio station receiving the antenna Polarization separating means for polarization-separating the wireless signal, first wireless signal processing means for performing signal processing of the first polarization wireless signal of the reception channel polarization-separated by the polarization separating means, Second radio signal processing means for performing signal processing of the radio signal of the second polarization of the reception channel that has been polarization-separated by the wave separation means, and the second radio signal processing means is a second radio signal processing means Received radio signal with the same polarization The first radio signal processing means corresponds to the interference wave component included in the received signal obtained by receiving the first polarized radio signal of the reception channel. A first interference compensation unit that generates a compensation signal to be generated from a reference signal, adds the reception signal and the compensation signal with equal amplitude and opposite phases, and outputs a demodulated signal in which an interference wave component is canceled.

  In the wireless receiver of the first invention, the first wireless signal processing means detects a compensation error component included in the received signal from which the interference wave component has been canceled, and feeds it back to the generation of the compensation signal for compensation with high compensation accuracy. Control means for generating a signal is included.

  A second aspect of the invention is a portable radio station of a portable radio communication system installed in the vicinity of a fixed radio station of a fixed radio communication system, and has a first polarization radio different in the same reception channel as the fixed radio station. In an interference suppression method of a portable radio communication system for receiving a signal, a first polarization radio signal and a second polarization assigned to the fixed radio station on the same reception channel as the fixed radio station receiving the antenna The radio signal is subjected to polarization separation, the signal processing of the first polarization radio signal of the reception channel polarization-separated by the first radio signal processing means is performed, and the polarization separation is performed by the second radio signal processing means The signal processing of the second polarization radio signal of the reception channel separated by the means is performed, and the second radio signal processing means receives the second polarization radio signal of the reception channel. Is output as a reference signal and the first The signal processing unit generates a compensation signal corresponding to an interference wave component included in the reception signal obtained by performing the reception processing on the radio signal having the first polarization of the reception channel from the reference signal, and the reception signal and the compensation signal have the same amplitude. A demodulated signal in which interference wave components are canceled by adding in the opposite phase is output.

  In the interference suppression method of the second invention, the first radio signal processing means detects a compensation error component included in the received signal in which the interference wave component is canceled, and feeds back to the generation of the compensation signal to compensate with high compensation accuracy. Generate a signal.

  The present invention enables interference compensation for interference between the same channel and different polarizations received from an adjacent fixed wireless communication system. Thereby, a portable radio station of a portable radio communication system that receives radio signals of the same channel and different polarizations in the vicinity of the fixed radio communication system can be installed.

It is a figure which shows the Example structure of the portable radio station of the portable radio | wireless communications system of this invention. 3 is a diagram illustrating a configuration example of an interference compensation unit 17. FIG. It is a figure which shows the structural example of a fixed radio | wireless communications system. It is a figure which shows assignment and a subject of a frequency channel and a polarization in case a fixed radio | wireless communications system and a portable radio | wireless communications system adjoin.

FIG. 1 shows an embodiment of the portable radio station of the portable radio communication system of the present invention.
In FIG. 1, the portable radio station of the present embodiment includes a vertically polarized radio signal processing unit 10V and a horizontally polarized radio signal processing unit 10H of a frequency channel to be used. When the portable radio station C shown in FIG. 4 is assumed, the transmission channels of the adjacent fixed radio station A are Ch1 (V), Ch2 (H), and Ch3 (V), and the reception channels are Ch4 (V) and Ch5. (H), Ch6 (V), the transmission channel of the portable radio station C is Ch1 (H), and the reception channel is Ch4 (H). That is, in the portable radio station C, the radio signal processing unit 10H corresponding to the horizontal polarization performs signal processing of the transmission signal of the channel Ch1 (H) and the reception signal of the channel Ch4 (H) to cope with the vertical polarization. As will be described later, the radio signal processing unit 10V performs an interference wave reception process on the channel Ch4 (V) and outputs a reference signal for performing interference compensation.

  The radio signal processing unit 10H includes a signal processing unit 11, a modulation unit 12, a transmission unit 13, a duplexer 14, a reception unit 15, a demodulation unit 16, and an interference compensation unit 17. The radio signal processing unit 10V has the same configuration. An antenna 19 is connected to the duplexer 14 of the radio signal processing units 10 </ b> V and 10 </ b> H via a polarization separator 18.

  The signal processing unit 11 performs an encoding process for transmitting the transmission data as a baseband signal, and outputs the transmission data to the modulation unit 12. The modulation unit 12 modulates the transmission data signal-processed by the signal processing unit 11 and outputs the modulated transmission data to the transmission unit 13. The transmission unit 13 frequency-converts the IF band modulation signal into a radio signal, further amplifies the power to a predetermined output, and transmits it from the antenna 19 via the duplexer 14 and the polarization separator 18.

  The receiving unit 15 amplifies a radio signal received by the antenna 19 and input via the polarization separator 18 and the duplexer 14, and further outputs a received signal (modulated signal) detected by performing frequency conversion to the demodulating unit 16. . The demodulator 16 demodulates the received signal in the IF band and outputs it to the signal processor 11 via the interference compensator 17. The signal processing unit 11 performs a decoding process on the baseband signal input from the demodulation unit 16 and outputs it as received data.

  Here, the radio reception apparatus of the portable radio communication system of the present invention corresponds to the reception unit 15, the demodulation unit 16, the interference compensation unit 17, and the polarization separator 18 of the radio signal processing units 10H and 10V. The configurations and functions of the interference compensation unit 17 of the radio signal processing unit 10H for horizontal polarization and the interference compensation unit 17 of the radio signal processing unit 10V for vertical polarization will be described below with reference to FIG.

  In FIG. 2, the interference compensation unit 17 of the vertically polarized radio signal processing unit 10V is transmitted from the fixed radio station B to the fixed radio station A, and is received by the portable radio station C. The channel Ch4 (V) Are received, and a reference signal (interference wave replica) corresponding to the demodulated interference wave is output to the interference compensation unit 17 of the radio signal processing unit 10H for horizontal polarization.

  The interference compensation unit 17 of the radio signal processing unit 10H for horizontal polarization includes a compensation signal generation unit 171, a subtraction unit 172, and a control unit 173. The compensation signal generation unit 171 receives a reference signal corresponding to the interference wave of the channel Ch4 (V), and is included in the demodulated signal of the channel Ch4 (H) received and processed by the horizontally polarized radio signal processing unit 10H. A compensation signal corresponding to the interference wave component of Ch4 (V) is generated and output. The subtracting unit 172 subtracts a compensation signal having the same amplitude and phase as the interference signal component of the channel Ch4 (V) from the demodulated signal of the channel Ch4 (H) (adding a compensation signal having the same amplitude and opposite phase) to obtain the channel Ch4. The demodulated signal of channel Ch4 (H) from which the interference wave component of (V) is canceled is output to the signal processing unit 11. The control unit 173 detects a compensation error component included in the demodulated signal of the channel Ch4 (H) and feeds it back to the compensation signal generation unit 171 to generate a compensation signal with high compensation accuracy.

  In the embodiment configuration of the portable radio station described above, a reference signal (interference wave replica) corresponding to an interference wave is generated from a demodulated signal of one polarization, a compensation signal is generated, and a demodulated signal of the other polarization is generated. The interference compensation unit 17 is arranged between the reception unit 15 and the demodulation unit 16 and the reception signal obtained by detecting the radio signal by the reception unit 15 is used. Similarly, a configuration for performing interference compensation may be used.

  Further, in the portable radio station D, when the signal of the channel Ch1 (V) transmitted from the fixed radio station A through the reception channel Ch1 (H) becomes an interference wave, interference compensation processing can be performed with the same configuration. . In the fixed radio station A, when the signal of the channel Ch4 (H) transmitted from the portable radio station D through the reception channel Ch4 (V) becomes an interference wave, the interference compensation process can be performed with the same configuration. . In the fixed radio station B, interference compensation processing can be performed with the same configuration even when the signal of the channel Ch1 (H) transmitted from the portable radio station C through the reception channel Ch1 (V) becomes an interference wave. .

A, B Fixed radio station C, D Portable radio station 10H Radio signal processor for horizontal polarization 10V Radio signal processor for vertical polarization 11 Signal processor 12 Modulator 13 Transmitter 14 Duplexer 15 Receiver 16 Demodulation Section 17 Interference compensation section 18 Polarization separator 19 Antenna

Claims (4)

A portable radio station of a portable radio communication system installed in the vicinity of a fixed radio station of a fixed radio communication system and receiving a radio signal having a different first polarization on the same reception channel as the fixed radio station. In a wireless receiver of a wireless communication system,
Polarization separation means for performing polarization separation of the first polarization radio signal and the second polarization radio signal assigned to the fixed radio station in the reception channel received by an antenna;
First radio signal processing means for performing signal processing of a radio signal of the first polarization of the reception channel that has been polarization-separated by the polarization separation means;
Second radio signal processing means for performing signal processing of a radio signal of the second polarization of the reception channel separated by the polarization separation means,
The second radio signal processing means includes second interference compensation means for outputting, as a reference signal, a reception signal obtained by receiving and processing a second polarization radio signal of the reception channel,
The first radio signal processing means generates from the reference signal a compensation signal corresponding to an interference wave component included in a received signal obtained by receiving and processing a first polarized radio signal of the reception channel, and the received signal And a first interference compensation unit that outputs a demodulated signal in which the interference wave component is canceled by adding the compensation signal with equal amplitude and opposite phase. A wireless receiver for a portable wireless communication system, comprising: In the radio | wireless receiver of the portable radio | wireless communications system of Claim 1,
The first radio signal processing means detects a compensation error component included in the received signal from which the interference wave component has been canceled, and feeds back the compensation signal to generate a compensation signal with high compensation accuracy. A wireless reception device for a portable wireless communication system. A portable radio station of a portable radio communication system installed in the vicinity of a fixed radio station of a fixed radio communication system and receiving a radio signal having a different first polarization on the same reception channel as the fixed radio station. In an interference suppression method for a wireless communication system,
Polarizing and separating the first polarized radio signal and the second polarized radio signal assigned to the fixed radio station in the reception channel received by the antenna;
The first radio signal processing means performs signal processing of the radio signal of the first polarization of the reception channel separated by the polarization,
The second radio signal processing means performs signal processing of the radio signal of the second polarization of the reception channel polarized by the polarization separation means,
The second radio signal processing means outputs, as a reference signal, a reception signal obtained by receiving and processing a radio signal of the second polarization of the reception channel.
The first radio signal processing means generates from the reference signal a compensation signal corresponding to an interference wave component included in a received signal obtained by receiving and processing a first polarized radio signal of the reception channel, and the received signal And the compensation signal are added with equal amplitude and opposite phase to output a demodulated signal in which the interference wave component is cancelled. An interference suppression method for a portable radio communication system, comprising: The interference suppression method of the portable radio communication system according to claim 3,
The first radio signal processing means detects a compensation error component included in the received signal from which the interference wave component has been canceled, and feeds back to the compensation signal generation to generate a compensation signal with high compensation accuracy. An interference suppression method for a portable wireless communication system.

Images