JP2012074768A - Polarization multiplex transmission system, receiver, polarization multiplex transmission method, and reception method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To turn a polarization multiplex number of orthogonal polarization multiplex to be equal to or larger than 3.SOLUTION: A transmitter obtains mapping components to an H polarization axis and a V polarization axis of P_θpolarization signals, and transmits multiplex signals of V polarization signals and the mapping component to the V polarization axis of the P_θpolarization signals by a V polarization antenna and multiplex signals of H polarization signals and the mapping component to the H polarization axis of the P_θpolarization signals by an H polarization antenna by the same frequency. A receiver demodulates and decodes the V polarization signals from the multiplex signals of V polarization and removes replica V polarization signals from the multiplex signals of the V polarization in the case that the signal power of the multiplex signals of the V polarization is higher than that of the multiplex signals of H polarization. When the signal power of the multiplex signals of the V polarization after replica removal is higher than that of the multiplex signals of the H polarization, the P_θpolarization signals are demodulated and decoded from the mapping components for which the multiplex signals of the V polarization after the replica removal are projected to a P_θpolarization axis, and the mapping components to the V polarization axis and the H polarization axis of the P_θpolarization signals are respectively removed from the multiplex signals of the V polarization after the replica removal and the multiplex signals of the H polarization.

Description

  The present invention relates to a polarization multiplexing transmission system, a receiving apparatus, a polarization multiplexing transmission method, and a reception method.

  In recent years, with the spread of wireless communication systems, frequency resources have been depleted mainly in the microwave band, and transmission techniques that achieve high frequency utilization efficiency are required. The orthogonal polarization multiplexing technology pays attention to the wavefront direction of the radio wave radiated from the antenna, and transmits independent signals having wavefronts orthogonal to each other at the same frequency. When this orthogonal polarization multiplexing technique is applied, VH polarization multiplexing using vertical (V) polarization and horizontal (H) polarization can be realized in the case of linear polarization used in fixed wireless communication or the like. In this case, the frequency utilization efficiency is doubled compared to the case where the orthogonal polarization multiplexing technique is not applied (see, for example, Non-Patent Document 1). The VH polarization multiplexed signal can be transmitted / received by, for example, arranging two linear radiating elements orthogonally in a cross shape.

Yamashita, F .; Kobayashi, K .; Ueba, M .; Takeda, Y .; Ando, K., “Variable Polarization / Frequency Division Multiplexing (VPFDM) for Satellite Communications,” IEEE VTC2006-Fall, pp.1-5

  As described above, due to the antenna configuration, the orthogonal relationship is limited to two axes, and the number of orthogonal multiplexing multiplexing is 2 is the upper limit. There is a technique that uses interference compensation with reception replica signal generation as a transmission technique that increases the number of multiplexed signals on the same polarization plane and achieves high frequency utilization efficiency, but when non-orthogonal polarization components are multiplexed on orthogonal components It cannot be applied as it is.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a polarization multiplexing transmission system, a receiving apparatus, and a polarization device capable of increasing the number of polarization multiplexing of orthogonal polarization multiplexing to 3 or more. It is to provide a multiplex transmission method and a reception method.

  In order to solve the above-described problem, the present invention provides a first polarization signal using a first polarization and a second polarization signal using a second polarization orthogonal to the first polarization. And a polarization multiplexing transmission system comprising a transmission device and a reception device for multiplexing and transmitting non-orthogonal polarization signals using non-orthogonal polarization with the first polarization and the second polarization. The transmitting apparatus projects the non-orthogonal polarization signal onto the first polarization to generate a first mapping component, and projects the non-orthogonal polarization signal onto the second polarization. A projection unit that generates a second mapping component; a first polarization transmission unit that transmits the first polarization signal; and the first mapping component generated by the projection unit at the same frequency; and the second polarization A second polarization transmission unit that transmits a signal and the second mapping component generated by the projection unit at the same frequency, and the reception device includes: A first polarization receiver for receiving a first multiplexed signal in which the first polarization signal and the first mapping component are multiplexed, and a second in which the second polarization signal and the second mapping component are multiplexed. A first polarization signal received by the first polarization receiver, or a signal obtained by removing a replica signal from the first multiplexed signal. And the second multiplexed signal received by the second polarization receiver, or the second processed signal, which is a signal obtained by removing a replica signal from the second multiplexed signal. When the comparison unit and the comparison unit determine that the quality of the first processing target signal is high, the first polarization signal or the non-orthogonal polarization signal is demodulated and decoded from the first processing target signal. The comparison unit determines that the quality of the second processing target signal is high. A demodulation decoding unit that demodulates and decodes the second polarization signal or the non-orthogonal polarization signal from the second processing target signal, the first polarization signal demodulated and decoded by the demodulation decoding unit, A non-orthogonal polarization signal, or a replica signal generation unit that generates a replica signal of the non-orthogonal polarization signal and the replica signal generation unit generates a replica signal of the non-orthogonal polarization signal. A first replica mapping component that is a projection conversion of the replica signal of the signal to the first polarization, and a projection conversion of the replica signal of the non-orthogonal polarization signal to the second polarization. When the first polarization signal is demodulated and decoded by the replica signal projection unit that generates two replica mapping components and the demodulation and decoding unit, the first signal generated by the replica signal generation unit from the first processing target signal Polarization signal When the new first processing target signal generated by removing the replica signal of the signal is output to the comparison unit, and the second polarization signal is demodulated and decoded by the demodulation and decoding unit, the second processing is performed. The new second processing target signal generated by removing the replica signal of the second polarization signal generated by the replica signal generation unit from the target signal is output to the comparison unit, and the non-demodulation decoding unit When the orthogonal polarization signal is demodulated and decoded, the new first processing target signal generated by removing the first replica mapping component generated by the replica signal projection unit from the first processing target signal is compared with the first processing target signal. And outputting a new second processing target signal generated by removing the second replica mapping component generated by the replica signal projection unit from the second processing target signal to the comparison unit. And a calculation unit, a polarization multiplexing transmission system, characterized in that.

  Further, the present invention is the polarization multiplexing transmission system described above, wherein the demodulation and decoding unit is configured to output the first processing target signal or the second processing target signal from the signal projected on the non-orthogonal polarization. The non-orthogonal polarization signal is demodulated and decoded.

  Further, the present invention is the polarization multiplexing transmission system described above, wherein the first process, the second process target signal, or the first process determined to be high by the comparison unit. A transmission path estimation unit that performs transmission path estimation from a target signal or a signal obtained by projecting the second processing target signal onto the non-orthogonal polarization, and a replica signal of the first polarization signal generated by the replica signal generation unit The transmission path estimation unit operates the transmission path estimation value estimated from the first processing target signal and outputs it to the subtraction unit, and the replica signal generation unit generates the replica signal of the second polarization signal generated by the replica signal generation unit. The transmission path estimation unit operates the transmission path estimation value estimated from the second processing target signal and outputs it to the subtraction unit, and the replica signal generation unit generates a replica signal of the non-orthogonal polarization signal, The transmission path estimation Parts further comprises an amplitude phase adjusting unit for outputting the said replica signal projection unit by the action of the transmission path estimation value estimated from the projection signal to the polarization of the non-orthogonal, and wherein the.

  In addition, the present invention is the polarization multiplexing transmission system described above, wherein the comparison unit determines signal quality based on signal power or a signal-to-interference noise ratio.

  The present invention also provides the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization. A receiving device in a polarization multiplexing transmission system that multiplexes and transmits a wave and a non-orthogonal polarization signal that uses a non-orthogonal polarization with the second polarization, the first polarization signal, A first polarization reception unit that receives a first multiplexed signal in which a first mapping component obtained by projecting the non-orthogonal polarization signal onto a first polarization is multiplexed; the second polarization signal; A second polarization receiving unit that receives a second multiplexed signal in which the second mapping component obtained by projecting the non-orthogonal polarization signal onto two polarizations is received, and the first polarization receiving unit receives the second multiplexed signal. The first multiplexed signal or the first signal to be processed, which is a signal obtained by removing the replica signal from the first multiplexed signal, and the second polarization receiving unit receive the first multiplexed signal. A comparison unit that compares the second multiplexed signal or a quality of a second processing target signal that is a signal obtained by removing a replica signal from the second multiplexed signal, and the comparison unit is the first processing target. When it is determined that the quality of the signal is high, the first polarization signal or the non-orthogonal polarization signal is demodulated and decoded from the first processing target signal, and the comparison unit determines that the quality of the second processing target signal is When it is determined that the signal is high, a demodulation decoding unit that demodulates and decodes the second polarization signal or the non-orthogonal polarization signal from the second processing target signal, and the first polarization that is demodulated and decoded by the demodulation decoding unit A replica signal generating unit that generates a signal, the second polarization signal, or a replica signal of the non-orthogonal polarization signal, and the replica signal generation unit generates a replica signal of the non-orthogonal polarization signal, Non-orthogonal polarization signal rep A second replica that is a projection conversion of the replica signal of the non-orthogonal polarization signal to the second polarization, and a first replica mapping component that is a projection conversion of the signal to the first polarization. When the first polarization signal is demodulated and decoded by the replica signal projection unit that generates the mapping component and the demodulation and decoding unit, the first polarization generated by the replica signal generation unit from the first processing target signal When the new first processing target signal generated by removing the replica signal is output to the comparison unit, and the second polarization signal is demodulated and decoded by the demodulation and decoding unit, the second processing is performed. The new second processing target signal generated by removing the replica signal of the second polarization signal generated by the replica signal generation unit from the target signal is output to the comparison unit, and the non-demodulation decoding unit Orthogonal polarization signal recovery When the decoding is performed, the first processing target signal generated by removing the first replica mapping component generated by the replica signal projection unit from the first processing target signal is output to the comparison unit. And a subtractor for outputting the second second processing target signal generated by removing the second replica mapping component generated by the replica signal projection unit from the second processing target signal to the comparison unit; It is provided with the receiving apparatus characterized by the above-mentioned.

  The present invention also provides the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization. A polarization multiplexing transmission method for a polarization multiplexing transmission system comprising a transmitter and a receiver for multiplexing and transmitting a wave and a non-orthogonal polarization signal using a non-orthogonal polarization with the second polarization, The transmitting apparatus projects the non-orthogonal polarization signal onto the first polarization to generate a first mapping component, and projects the non-orthogonal polarization signal onto the second polarization. A projection process for generating a mapping component; a first polarization transmission process for transmitting the first polarization signal and the first mapping component generated in the projection process at the same frequency; and the second polarization signal; A second polarization transmission process for transmitting the second mapping component generated in the projection process at the same frequency, and the receiver A first polarization receiving process for receiving the first multiplexed signal in which the first polarization signal and the first mapping component are multiplexed, and a second in which the second polarization signal and the second mapping component are multiplexed. A second polarization receiving process for receiving two multiplexed signals and the first multiplexed signal received in the first polarization receiving process or a signal obtained by removing a replica signal from the first multiplexed signal. A first signal to be processed and a second signal to be processed which is a signal obtained by removing a replica signal from the second multiplexed signal received in the second polarization reception process or the second multiplexed signal; A comparison process for comparing the quality of the first processing target signal, and the first processing target signal from the first polarization signal or the non-orthogonal polarization when it is determined that the quality of the first processing target signal is high The signal is demodulated and decoded. When the quality of the second processing target signal is determined to be high, a demodulation decoding process for demodulating and decoding the second polarization signal or the non-orthogonal polarization signal from the second processing target signal, and the demodulation A replica signal generation process for generating a replica signal of the first polarization signal, the second polarization signal, or the non-orthogonal polarization signal demodulated and decoded in the decoding process, and the non-orthogonal signal in the replica signal generation process When a replica signal of a polarization signal is generated, a first replica mapping component that is a projection conversion of the replica signal of the non-orthogonal polarization signal to the first polarization is generated, and the non-orthogonal polarization signal A replica signal projection process for generating a second replica mapping component, which is a projection conversion of the replica signal to the second polarization, and a case where the first polarization signal is demodulated and decoded in the demodulation and decoding process Removing the replica signal of the first polarization signal generated in the replica signal generation process from the first process target signal to generate a new first process target signal, and in the demodulation and decoding process, When the second polarization signal is demodulated and decoded, the replica signal of the second polarization signal generated in the replica signal generation process is removed from the second processing target signal to obtain a new second processing target. When a signal is generated and the non-orthogonal polarization signal is demodulated and decoded in the demodulation and decoding process, the first replica mapping component generated in the replica signal projecting process is removed from the first processing target signal and a new signal is generated. And generating the first processing target signal and removing the second replica mapping component generated in the replica signal projection process from the second processing target signal. And a subtraction process of generating a new second processing signal Te, after the subtraction process, the process is repeated from the comparison step, it is polarization multiplexing transmission method according to claim.

The present invention also provides the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization. A reception method of a receiving apparatus in a polarization multiplexing transmission system that multiplexes and transmits a wave and a non-orthogonal polarization signal that uses a non-orthogonal polarization with the second polarization, the first polarization signal Receiving a first multiplexed signal in which a first mapping component obtained by projecting the non-orthogonal polarization signal onto the first polarization is received; and
Receiving a second multiplexed signal obtained by multiplexing the second polarization signal and a second mapping component obtained by projecting the non-orthogonal polarization signal onto the second polarization; and The first multiplexed signal received in the first polarization reception process, or a first processing target signal that is a signal obtained by removing a replica signal from the first multiplexed signal, and the second polarization reception process A comparison process for comparing the quality of the second multiplexed signal received in step S2 or a second processing target signal that is a signal obtained by removing a replica signal from the second multiplexed signal; When it is determined that the quality of the processing target signal is high, the first polarization signal or the non-orthogonal polarization signal is demodulated and decoded from the first processing target signal, and the second processing target is compared in the comparison process. When it is judged that the signal quality is high A demodulation decoding process for demodulating and decoding the second polarization signal or the non-orthogonal polarization signal from the second signal to be processed; the first polarization signal demodulated and decoded in the demodulation decoding process; A replica signal generation process for generating a wave signal or a replica signal of the non-orthogonal polarization signal, and when the replica signal of the non-orthogonal polarization signal is generated in the replica signal generation process, the non-orthogonal polarization signal Generating a first replica mapping component which is a projection conversion of the replica signal of the non-orthogonal polarization signal to the first polarization, and a second conversion of the replica signal of the non-orthogonal polarization signal to the second polarization When the first polarization signal is demodulated and decoded in the replica signal projection process for generating a replica mapping component and the demodulation and decoding process, the replica signal generation process from the first processing target signal If the replica signal of the first polarization signal generated in step 1 is removed to generate a new first processing target signal, and the second polarization signal is demodulated and decoded in the demodulation and decoding process, A replica signal of the second polarization signal generated in the replica signal generation process is removed from a second process target signal to generate a new second process target signal, and the non-orthogonal in the demodulation decoding process When the polarization signal is demodulated and decoded, the first replica mapping component generated in the replica signal projection process is removed from the first processing target signal to generate a new first processing target signal, A subtraction process for generating a new second processing target signal by removing the second replica mapping component generated in the replica signal projection process from the second processing target signal; A receiving method, wherein after the subtraction process, the process from the comparison process is repeated.

  According to the present invention, polarization multiplexing of three or more polarizations can be realized using orthogonal two-polarization multiplexing antennas, and frequency use efficiency can be improved. Further, even when there is a difference in the reception levels between these antenna elements, it is possible to avoid demodulation errors and restore a normal information sequence of each polarization signal.

It is a figure for demonstrating the operation | movement outline | summary of the transmitter in the polarization multiplexing transmission system by one Embodiment of this invention. It is a figure for demonstrating the operation | movement outline | summary of the receiver in the polarization multiplexing transmission system by the embodiment. It is a figure for demonstrating the operation | movement outline | summary of the receiver in the polarization multiplexing transmission system by the embodiment. It is a figure for demonstrating the operation | movement outline | summary of the receiver in the polarization multiplexing transmission system by the embodiment. It is a figure for demonstrating the operation | movement outline | summary of the receiver in the polarization multiplexing transmission system by the embodiment. It is a functional block diagram which shows the structural example of the transmitter by the same embodiment. It is a flowchart showing the flow of the signal transmission process of the transmitter shown in FIG. It is a functional block diagram which shows the other structural example of the transmitter by the same embodiment. It is a flowchart showing the flow of the signal transmission process shown in FIG. It is a functional block diagram which shows the further another example of a structure of the transmitter by the same embodiment. It is a flowchart showing the flow of the signal transmission process of the transmitter shown in FIG. It is a functional block diagram which shows the structure of the receiver by the same embodiment. It is a functional block diagram which shows the structure of the demodulation decoding process part of V polarization signal of the receiver by the same embodiment, and H polarization signal. It is a functional block diagram which shows the structure of the demodulation decoding process part of the P_theta _i polarization signal of the receiver by the same embodiment. It is a flowchart showing the flow of the signal reception process of the receiver by the same embodiment. It is a figure for demonstrating the signal reception process of the receiver by the same embodiment. It is a figure for demonstrating the signal reception process of the receiver by the same embodiment. It is a figure for demonstrating the signal reception process of the receiver by the same embodiment. It is a figure for demonstrating the signal reception process of the receiver by the same embodiment. It is a figure which shows the polarization multiplexing of the conventional polarization multiplexing transmission system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 20 is a diagram illustrating polarization multiplexing in a conventional polarization multiplexing transmission system. As shown in the figure, in a conventional polarization multiplexing transmission system, two orthogonally polarized waves having the same frequency, which are orthogonally polarized waves (hereinafter referred to as “V polarized waves”) and horizontal polarized waves (hereinafter referred to as “V polarized waves”). VH polarization multiplexing using “H polarization” is performed, and different signal sequences are transmitted and received for each of the V polarization and the H polarization. The V polarization has a wavefront perpendicular to the ground, and the H polarization has a wavefront parallel to the ground. The V polarization and the H polarization are transmitted in the same or partially overlapping frequency band. In order to perform VH polarization multiplexing, a transmission device of a conventional polarization multiplexing transmission system includes a two-element antenna for VH polarization multiplexing as a transmission antenna, and a reception device for VH polarization multiplexing as a reception antenna. A two-element antenna is provided. The two-element antenna for VH polarization multiplexing is a two-polarization multiplexing antenna. The two-element antenna for VH polarization multiplexing includes a V-polarization antenna and an H-polarization antenna that are orthogonal to each other.

In the polarization multiplexing transmission system of the present embodiment, the transmission device includes a two-element antenna for VH polarization multiplexing as a transmission antenna, and the reception device as a reception antenna, as in the polarization multiplexing transmission system of the prior art. A two-element antenna for VH polarization multiplexing is provided. However, since the polarization multiplexing transmission system of this embodiment performs non-orthogonal polarization multiplexing transmission, in addition to the V polarization and the H polarization, the angle θ _i degrees (0 <θ _i <180) with respect to the ground. ) Wavefront of P_θ _i polarization (i = 1, 2,..., N; n is a positive integer). The P_θ _i polarization is transmitted in a frequency band that is the same as or partially overlapping with the V polarization and the H polarization.

FIG. 1 is a diagram for explaining the outline of signal transmission processing in the transmission apparatus of the polarization multiplexing transmission system according to this embodiment. As shown in the figure, the transmitting apparatus projects a P_θ _i polarization signal with a polarization axis z onto the wavefront of the V polarization to obtain a mapping component with the V polarization axis (y axis). Further, the transmission apparatus projects the P_θ _i polarization signal of the polarization axis z onto the wavefront of the H polarization to obtain a mapping component of the H polarization axis (x axis). That is, the transmission apparatus vector-decomposes the P_θ _i polarization signal into V polarization and H polarization. When the signal component of the polarization axis z of the P_θ _i polarization signal is p_θ _i , the mapping component H _i to the H polarization axis is p_θ _i · cos θ _i , and the mapping component V _i to the V polarization axis is , P_θ _i · cos (π / 2−θ _i ) = p_θ _i · sin θ _i . The transmitting apparatus multiplexes the V polarization signal V ₀ and the mapping component V _i (i = 1 to n) of the P_θ _i polarization signal onto the V polarization axis and transmits the multiplexed signal by the V polarization antenna. The signal H ₀ and the mapping component H _i (i = 1 to n) of the P_θ _i polarization signal to the H polarization axis are multiplexed and transmitted by the H polarization antenna. Thereby, it is possible to multiplex and transmit three or more polarized waves by the two-element antenna.
M (A → B) represents the projection conversion from the A polarization to the B polarization. When the A polarization and the B polarization are orthogonal, the conversion result is zero. When the A polarization is non-orthogonal, the conversion result is generally non-zero.

2 to 5 are diagrams illustrating an outline of signal reception processing in the reception apparatus of the polarization multiplexing transmission system according to the present embodiment.
As shown in FIG. 1, the multiplexed polarization transmitted can be demodulated in the receiving apparatus by using interference cancellation processing. Interference cancellation processing is to demodulate and decode any one signal from a received signal in which a plurality of signals are multiplexed, generate a replica signal of the obtained signal, remove it from the received signal, and remove the replica signal. In this process, one of the received signals is further demodulated and decoded to obtain each multiplexed signal.

On the other hand, “Ulaby, FT; Wilson, EA,“ Microwave Attenuation Properties of Vegetation Canopies, ”IEEE Transactions on Geoscience and Remote Sensing, Volume: GE-23, Issue: 5 pp.746-753, 1985.” (Reference A) Due to the difference in thermal noise in the RF (Radio Frequency) circuit of each of V polarization and H polarization, the difference in power amplifier characteristics, etc. There may be non-uniformity in the received SNR (Signal to Noise ratio). When the reception and SNR of the V polarization and the H polarization are uneven, the demodulation and decoding of the V polarization signal or the H polarization signal, which is the first-stage demodulation and decoding operation of the interference cancellation processing, has failed. In some cases, it is impossible to restore a non-orthogonal polarization multiplexed P_θ _i polarization signal. Therefore, the receiving apparatus demodulates and decodes either the received SINR (Signal to Interference and Noise Ratio) or the V-polarized wave or the H-polarized wave received by the antenna element having a high reception level.

Here, as shown in FIG. 2, the reception SNR is uneven, and when the signal is received by the receiving apparatus, the reception level of the V polarization element is higher, and the received V polarization signal is the first. A case of demodulating and decoding will be described. At this time, the non-orthogonal polarization multiplexed P_θ ₁ polarization signal to P_θ _n polarization signal becomes an interference noise component, that is, noise for the V polarization signal V ₀ which is a desired wave. However, when the level of the mapping component V _i (i = 1 to n) of the P_θ _i polarization signal on the V polarization axis is sufficiently lower than the V polarization signal V ₀ which is the desired wave, V V is obtained by interference cancellation processing. it is possible to demodulate the polarized signals V _0. This is also the case for the H polarization signal H _0. Since the P_θ _i polarization signal is vector-decomposed into V polarization and H polarization, the influence on the V polarization signal V ₀ and the H polarization signal H ₀ is suppressed. A reception signal of the V polarization antenna, that is, a reception signal in which the V polarization signal V ₀ and the mapping component V _i (i = 1 to n) of the P_θ _i polarization signal to the V polarization axis are multiplexed is represented by V The polarization processing target signal RV ₀ is used, and the received signal of the H polarization antenna, that is, the H polarization signal H ₀ and the mapping component H _{i of} the P_θ _i polarization signal to the H polarization axis (i = 1 to n). And the received signal multiplexed with is defined as the H polarization processing target signal RH ₀ . In Figure 2-5, for simplicity, when n = 1, i.e., it shows the reception processing overview in the case where only P_shita ₁ polarized signals to the V polarization signal V ₀ and H polarization signal H ₀ is multiplexed ing.

The receiving apparatus demodulates and decodes the V-polarization processing target signal RV ₀ to restore the information sequence of the V-polarization signal V ₀ , and performs re-encoding and re-modulation based on the restored information sequence to obtain the V polarization. a replica signal of the wave signal V ₀ generates a replica V polarization signal V _{0 '.}

Next, as illustrated in FIG. 3, the reception apparatus generates the V polarization processing target signal RV ₁ by removing the replica V polarization signal V ₀ ′ from the V polarization processing target signal RV ₀ . The V polarization processing target signal RV ₁ includes only the mapping component V ₁ of the P_θ ₁ polarization signal. Further, since the mapping component when the replica V-polarized signal V ₀ ′ is projected onto the H-polarization axis is 0, the H-polarization processing target signal RH ₀ becomes the H-polarization processing target signal RH ₁ as it is. The H-polarized wave processed signal RH _1, mapping component _{H 1} to H axis of polarization of the H polarization signal _{H 0} and P_shita ₁ polarized signal are multiplexed.

Subsequently, as illustrated in FIG. 4, the reception device compares the signal powers of the V polarization processing target signal RV ₁ and the H polarization processing target signal RH ₁ , and the V polarization processing target signal RV ₁ having high signal power. Are determined as the next demodulation and decoding targets. The receiving apparatus projects the V polarization processing target signal RV ₁ onto the P_θ ₁ polarization plane. When the signal component of the V polarization processing target signal RV ₁ is y, the z-axis component when projected onto the P_θ ₁ polarization plane is z = y / cos θ ₁ . The receiving apparatus demodulates and decodes a signal obtained by projecting the V polarization processing target signal RV ₁ onto the P_θ ₁ polarization plane, restores the information sequence of the P_θ ₁ polarization signal, and re-encodes the signal based on the restored information sequence. Then, a replica P_θ ₁ polarization signal is generated. The receiving apparatus generates a replica mapping component H ₁ ′ obtained by projecting the replica P_θ ₁ polarization signal onto the H polarization plane.

Then, as illustrated in FIG. 5, the reception apparatus removes the replica mapping component H ₁ ′ obtained by projecting the replica P_θ ₁ polarization signal onto the H polarization plane from the H polarization processing target signal RH ₁ , and performs H polarization processing. generating a target signal RH _2. The H polarization processing target signal RH ₂ includes only the H polarization signal H ₀ . The receiving apparatus demodulates and decodes the H polarization processing target signal RH ₂ to restore the information sequence of the H polarization signal H ₀ .

In the case i is 2 or more, after the replica P_shita ₁ polarized signal generator shown in FIG. 4, operates as follows. That is, the receiving apparatus removes the replica mapping component V ₁ ′ obtained by projecting the replica P_θ ₁ polarization signal on the V polarization plane from the V polarization processing target signal RV ₁ to generate the V polarization processing target signal RV _2. , by removing the replica P_shita ₁ polarized signal replica mapping component projected in the H-polarized wave surface H1 'from the H polarization processing signal RH ₁ generates the H polarization processing signal RH _2.

Thereafter, i is incremented by 1 from 2, and the higher of the signal power of the V polarization processing target signal RV _i and the H polarization processing target signal RH _i is biased until the information sequences of all polarization signals are obtained. Projected onto the wave axis to demodulate / decode the polarization signal, and project the replica polarization signal generated from the restored information sequence onto the VH wavefront, and map it to the V polarization axis and H polarization axis each, V polarization processing signal _RV i, the process of generating is removed from the H polarization processing signal RH _i V polarization processing signal _{RV (i + 1)} and the H polarization processing signal _{RH (i + 1)} repeat.

Note that the order of demodulation and decoding is determined in advance. For example, in the V polarization signal V ₀ and the P_θ ₁ polarization signal to P_θ _n polarization signal, the V polarization signal V ₀ is the first, and the H polarization In the signal H ₀ and the P_θ ₁ polarization signal to P_θ _n polarization signal, the H polarization signal H ₀ is the first. Among the P_θ ₁ polarization signal to P_θ _n polarization signal, the order is P_θ ₁ polarization signal, P_θ ₂ polarization signal,..., P_θ _n polarization signal. At this time, the V polarization signal V ₀ has a power level that can be demodulated even if the mapping components V _{1 to} V _n of the P_θ ₁ polarization signal to P_θ _n polarization signal onto the V polarization axis are multiplexed, The polarization signal H ₀ has a power level that can be demodulated even if the mapping components H _{1 to} H _n of the P_θ ₁ polarization signal to P_θ _n polarization signal onto the H polarization axis are multiplexed. Similarly, the mapping component V _j of the P_θ _j polarization signal (j = 1 to (n−1)) to the V polarization axis is P_θ _{(j + 1)} polarization signal to P_θ V polarization axis of the _n polarization signal. The mapping component H to the H polarization axis of the P_θ _j polarization signal (j = 1 to (n−1)) is set to a power level that can be demodulated even if the mapping components V _{(j + 1) to} V _n are multiplexed. _j is, P_θ _{(j + 1)} and polarized signal ～P_shita _n polarization signal mapping component _H to H polarization axis _{(j +} 1) _{~H n} can be demodulated be multiplexed power level. The order of demodulation and decoding of each polarization may be stored in advance in the transmission device and the reception device, and the order determined by the transmission device may be notified to the reception device by a control signal.

Hereinafter, when “V polarization processing target signal” is described, it is assumed that one of the V polarization processing target signals RV _{0 to} V polarization processing target signal RV _{(n + 1)} is selected and shown. In the case of “polarization processing target signal”, it is assumed that one of the H polarization processing target signal RH _{0 to} V polarization processing target signal RH _{(n + 1)} is selected and shown, and “processing target signal” is described. In this case, it is assumed that either the V polarization processing target signal or the H polarization processing target signal is selected and shown.

  Next, the configuration and detailed operation of the transmitter and receiver of the polarization multiplexing transmission system will be described.

FIG. 6 is a block diagram showing a configuration of a transmission apparatus according to an embodiment of the present invention.
As shown in the figure, the transmission apparatus 100 includes encoders 110-0 to 110- (n + 1), modulators 120-0 to 120- (n + 1), and projectors 130a-1 to 130a- in one housing. n, projectors 130b-1 to 130b-n, an adder 140a, an adder 140b, a V polarization antenna 150a, and an H polarization antenna 150b.

The encoder 110-0 is input information sequence is a bit stream to be transmitted by the V polarization signal _{V 0,} the encoder 110-i (i = 1~n) , by P_shita _i polarization signal The information sequence to be transmitted is input, and the information sequence to be transmitted by the H polarization signal H ₀ is input to the encoder 110- (n + 1). Encoder 110-k (k = 0 to (n + 1)) performs a predetermined error correction encoding on the input information sequence, and converts the error correction encoded information sequence into modulator 120-. output to k. As the error correction code, for example, a Reed-Solomon code, a turbo code, a low density parity check code, or the like can be used.

Modulator 120-k (k = 0 to (n + 1)) modulates the error correction coded information sequence input from encoder 110-k using a predetermined modulation method, and outputs a modulated signal. To do. As the modulation method, for example, BPSK (Binary phase-shift keying), 16QAM (16 Quadrature amplitude modulation), or the like can be used. The modulator 120-0 outputs a V polarization signal V ₀ that is a modulation signal using V polarization, and the modulator 120-i (i = 1 to n) is a modulation signal using P_θ _i polarization. P_θ _i polarization signal is output, and the modulator 120- (n + 1) outputs an H polarization signal H ₀ which is a modulation signal using H polarization.

Projectors 130a-i (i = 1 to n) map to the V polarization axis obtained by projecting the modulation signal of P_θ _i polarization input from modulator 120-i onto the wavefront of V polarization. The component V _i is output to the adder 140a. Further, the projectors 130b-i (i = 1 to n) are directed to the H polarization axis obtained by projecting the P_θ _i polarization modulation signal input from the modulator 120-i onto the H polarization wavefront. and it outputs the mapping component _{H i} to the adder 140b.

The adder 140a includes a V polarization signal _{V 0} inputted from the modulator 120 - 0, V polarization multiplexing by adding the mapping component _{V i} input from the projector 130a-i (i = 1~n) A signal is generated and output to the V polarization antenna 150a. The adder 140b is an H polarization signal _{H 0} inputted from the modulator 120- (n + 1), H polarized by adding the mapping component _{H i} input from the projector 130b-i (i = 1~n) A wave multiplexed signal is generated and output to the H polarization antenna 150b. The V polarization antenna 150a wirelessly transmits the V polarization multiplexed signal input from the adder 140a. The H polarization antenna 150b wirelessly transmits the H polarization multiplexed signal input from the adder 140b.

Subsequently, a signal transmission process of the transmission device 100 will be described. FIG. 7 is a flowchart showing the flow of signal transmission processing of the transmission apparatus 100.
The encoder 110-k (k = 0 to (n + 1)) performs error correction encoding of the input information sequence (step S101), and the modulator 120-k corrects the error by the encoder 110-k. The encoded information sequence is modulated (step S102). The projectors 130a-i (i = 1 to n) generate the mapping component V _i to the V polarization axis from the modulation signal of the P_θ _i polarization modulated by the modulator 120-i (step S103a), and the projection The generator 130b-i generates a mapping component H _i to the H polarization axis from the modulation signal of P_θ _i polarization modulated by the modulator 120-i (step S103b).

The adder 140a is a mapping component V of the modulation signal of the V polarization signal V ₀ generated by the modulator 120-0 and the modulation signal of the P_θ _i polarization generated by the projectors 130a-i (i = 1 to n). ₁ ~V _n by adding to generate a V polarization multiplexing signal (step S104a), and outputs the V-polarized wave antenna 150a. The adder 140b maps the modulation signal of the H polarization signal H ₀ generated by the modulator 120- (n + 1) and the modulation signal of the P_θ _i polarization generated by the projectors 130b-i (i = 1 to n). The components H _{1 to} H _n are added to generate an H polarization multiplexed signal (step S104b) and output to the H polarization antenna 150b. The V polarization antenna 150a wirelessly transmits the V polarization multiplexed signal input from the adder 140a (step S105a). The H polarization antenna 150b wirelessly transmits the H polarization multiplexed signal output from the adder 140b (step S105b). The V polarization antenna 150a and the H polarization antenna 150b transmit signals simultaneously by radio of the same frequency.

FIG. 8 is a block diagram showing another configuration of the transmission apparatus.
As shown in the figure, the transmission apparatus 200 includes (n + 2) transmission units 201-0 to 201- (n + 1) each configured by one housing. Transmitting unit 201-0 transmits the V polarization signal _{V 0,} the transmitting unit 201-i (i = 1~n) transmits P_shita _i polarized signal, the transmission unit 201- (n + 1) is H to send a polarized signal _{H 0.} 6 multiplexes and transmits polarization signals within the housing, but in the transmission device 200 illustrated in FIG. 8, each of the transmission units 201-0 to 201- (n + 1) is a polarization signal. Send. As a result, the V polarization antenna on the receiver side receives the V polarization multiplexed signal obtained by multiplexing the mapping component of each polarization signal on the V polarization axis, and the H polarization antenna receives each polarization signal. An H polarization multiplexed signal obtained by multiplexing the mapping components of the H polarization axis is received. The transmission device 200 is intended for fixed communication and satellite communication, and the polarization angle is set at the time of installation by manual adjustment. In addition, each housing | casing of the transmission parts 201-0-0-201- (n + 1) may be used by the same user, and may be used by a respectively different user. Moreover, each housing | casing of the transmission parts 201-0-0-201- (n + 1) may be installed in the same place, and may be installed in a respectively different place.

The transmission unit 201-k (k = 0 to (n + 1)) includes an encoder 210-k and a modulator 220-k. Further, the transmission unit 201-0 includes a V polarization antenna 250-0, the transmission unit 201-i (i = 1 to n) includes a P_θ _i polarization antenna 250-i, and the transmission unit 201- (n + 1). ) 0 includes an H-polarized antenna 250- (n + 1). Each P_θ _i polarization antenna 250-i is installed with the angle adjusted according to the polarization angle θ _i .

The encoder 210-k (k = 0 to (n + 1)) performs error correction encoding processing similar to that of the encoder 110-k of the transmission apparatus 100 illustrated in FIG. The same modulation as that of the modulator 120-k of the transmission apparatus 100 shown in FIG. The V polarization antenna 250-0 wirelessly transmits the V polarization signal input from the modulator 220-0, and the P_θ _i polarization antenna 250-i (i = 1 to n) is the modulator 220. The P_θ _i polarization signal input from −i is transmitted by radio, and the H polarization antenna 250- (n + 1) transmits the H polarization signal output from the modulator 220- (n + 1) by radio.

Subsequently, a signal transmission process of the transmission device 200 will be described. FIG. 9 is a flowchart showing the flow of signal transmission processing of the transmission apparatus 200. In addition, the flowchart showing the flow of the transmission process in each transmitting unit 201-k (k = 0 to (n + 1)) is the same flowchart. Therefore, a flowchart corresponding to the transmitting unit 201-k (k = 0 to (n + 1)) is collectively shown in FIG.
In transmission section 201-0, encoder 210-0 performs error correction encoding of the input information sequence (step S201), and modulator 220-0 performs error correction encoding by encoder 210-0. The modulated information series is modulated (step S202) and output to the V polarization antenna 250-0.
On the other hand, in the transmission unit 201-i (i = 1 to n), the encoder 210-i performs error correction encoding of the input information sequence (step S201), and the modulator 220-i performs encoding. The information sequence that has been subjected to error correction coding by the device 210-i is modulated (step S202), and is output to the P_θ _i polarization antenna 250-i.

Also, in the transmission unit 201- (n + 1), the encoder 210- (n + 1) performs error correction encoding of the information sequence (step S201), and the modulator 220- (n + 1) is the encoder 210- ( n + 1) modulates the error correction-encoded information sequence (step S202), and outputs it to the H polarization antenna 250- (n + 1).
V polarized wave antenna 250-0 transmits wirelessly V polarization signal _{V 0} (step S203). The P_θ _i polarization antenna 250-i (i = 1 to n) transmits the P_θ _i polarization signal by radio (step S203). H polarization antenna 250- (n + 1) transmits by radio the H polarization signal _{H 0} (step S203). V-polarized antenna 250-0, P_θ _i- polarized antenna 250-i (i = 1 to n), and H-polarized antenna 250- (n + 1) transmit signals simultaneously by radio of the same frequency. To do.

  FIG. 10 is a block diagram showing still another configuration of the transmission apparatus. In this figure, the same parts as those of the transmitting apparatus 200 shown in FIG. The transmission apparatus 300 shown in this figure is different from the transmission apparatus 200 shown in FIG. 8 in that transmission units 301-1 to 301-n are provided instead of the transmission units 201-1 to 201-n. . In the transmission apparatus 100 illustrated in FIG. 6, one transmission apparatus includes a two-element antenna for VH polarization multiplexing, but in the transmission apparatus 300 illustrated in FIG. 10, each of the transmission units 301-1 to 301-n. However, it has a two-element antenna for VH polarization multiplexing, and multiplexes the V polarization signal and the H polarization signal on the antenna.

  The transmitter 301-i (i = 1 to n) includes an encoder 310-i, a modulator 320-i, a projector 330a-i, a projector 330b-i, a V polarization antenna 350a-i, and It includes an H-polarization antenna 350b-i.

The encoder 310-i (i = 1 to n) performs the same processing as the encoder 210-i of the transmission apparatus 200 shown in FIG. 8, and the modulator 320-i performs the process of the transmission apparatus 200 shown in FIG. The same processing as that of the modulator 220-i is performed.
Projector 330a-i (i = 1~n) is mapping the modulated signal P_shita _i polarized input from the modulator 320-i to the V-polarized wave axes obtained by projecting the wavefront of the V-polarized wave The component V _i is output. Further, the projector 330b-i (i = 1~n) includes a modulator 320-i to P_shita _i polarization modulated signal inputted from the H polarization axis obtained by projecting the wavefront of H polarization The mapping component H _i is output.

Subsequently, a signal transmission process of the transmission device 300 will be described. FIG. 11 is a flowchart showing a flow of signal transmission processing of the transmission apparatus 300. Note that the flow of transmission processing in the transmission unit 201-0 and the transmission unit 201- (n + 1) is as shown in FIG. Therefore, the description using the flowchart is omitted for the flow of the transmission processing in the transmission unit 201-0 and the transmission unit 201- (n + 1). Moreover, the flowchart showing the flow of the transmission process in each transmitter 301-i (i = 1 to n) is the same flowchart. Therefore, a flowchart corresponding to the transmission unit 301-i (i = 1 to n) is collectively shown in FIG.
The transmission unit 201-0 and the transmission unit 201- (n + 1) operate in the same manner as the transmission device 200, and a modulation signal is input to the V polarization antenna 250-0 and the H polarization antenna 250- (n + 1). .

On the other hand, in the transmission unit 301-i (i = 1 to n), the encoder 310-i performs error correction encoding on the input information sequence (step S301), and the modulator 320-i performs encoding. The information sequence that has been subjected to error correction coding by the device 310-i is modulated (step S302). The projectors 330a-i (i = 1 to n) generate the mapping component V _i to the V polarization axis from the modulation signal of the P_θ _i polarization modulated by the modulator 320-i (step S303a). It outputs to the wave antenna 350a-i. Further, the projector 330b-i (i = 1 to n) generates a mapping component H _i to the H polarization axis from the modulation signal of the P_θ _i polarization modulated by the modulator 320-i (Step S303b). Output to the H polarization antenna 350b-i.

V polarized wave antenna 250-0 transmits wirelessly V polarization signal _{V 0.} The V polarization antenna 350a-i (i = 1 to n) wirelessly transmits the mapping component V _i of the P_θ _i polarization signal to the V polarization axis (step S304a). The H polarization antenna 350b-i (i = 1 to n) wirelessly transmits the mapping component H _i of the P_θ _i polarization signal to the H polarization axis (step S304b). H polarization antenna 250- (n + 1) transmits the H polarization signal _{H 0} wirelessly. V-polarized antenna 250-0, V-polarized antenna 350a-i (i = 1 to n), and H-polarized antenna 250- (n + 1) transmit signals simultaneously by radio of the same frequency. .

FIG. 12 is a block diagram illustrating a configuration of a receiving device 500 according to an embodiment of the present invention.
As shown in the figure, the receiving device 500 includes a V-polarized antenna 501, an H-polarized antenna 502, a power measuring device 503, a power measuring device 504, a comparator 505, a selector 506, and a demodulation / decoding processing unit. 510-0 to 510- (n + 1).

  The V polarization antenna 501 receives the V polarization multiplexed signal, and the H polarization antenna 502 receives the H polarization multiplexed signal. The power measuring device 503 measures the signal power of the V polarization multiplexed signal received by the V polarization antenna 501, and the power measuring device 504 receives the signal power of the H polarization multiplexed signal received by the H polarization antenna 502. Measure. The comparator 505 compares the signal power measured by the power measuring devices 503 and 504, and instructs the selector 506 by the control signal to select the received signal having the higher power level as the demodulation decoding target.

When the V polarization multiplexed signal is selected as a demodulation and decoding target, the selector 506 uses the V polarization processing target signal RV ₀ that is a V polarization multiplexed signal as a demodulation decoding target signal and the H polarization that is an H polarization multiplexed signal. If the wave processed signal RH ₀ and outputs to the demodulation decoding section 510-0 as demodulation and decoding non-target signals, and selects the H polarization multiplexing signal as a demodulated decoded, the H-polarized wave processed is H polarization multiplexing signal The signal RH ₀ is output as a demodulation decoding target signal, and the V polarization processing target signal RV ₀ which is a V polarization multiplexed signal is output as a demodulation decoding non-target signal to the demodulation decoding processing unit 510- (n + 1). Demodulation decoding unit 510-0 performs a demodulating and decoding of the V polarization signal _{V 0} from the V polarization processing signal is demodulated decoded signal, demodulation decoding unit 510-i (i = 1~n) is The P_θ _i polarization signal is demodulated and decoded from the V polarization processing target signal or the H polarization processing target signal that is the demodulation decoding target signal, and the demodulation decoding processing unit 510- (n + 1) performs the H polarization that is the demodulation decoding target signal. Demodulation decoding of the H polarization signal H _{0 is performed} from the wave processing target signal.

  FIG. 13 is a block diagram illustrating a configuration of the demodulation / decoding processing unit 510-0 illustrated in FIG. The demodulation / decoding processing unit 510- (n + 1) has a configuration in which “−0” of the code of each part of the internal configuration of the demodulation / decoding processing unit 510-0 is replaced with “− (n + 1)”. Hereinafter, the configuration of the demodulation / decoding processor 510-0 will be described.

  As shown in the figure, the demodulation / decoding processing unit 510-0 includes a delay unit 511-0, a delay unit 512-0, a transmission path estimator 514-0, a demodulator 515-0, a decoder 516-0, and a re-encoding. 517-0, remodulator 518-0, amplitude phase adjuster 519-0, subtractor 521-0, power meter 524-0, power meter 525-0, comparator 526-0, and selection And 527-0.

The delay device 511-0 stores the H polarization processing target signal, which is a demodulation / decoding non-target signal, and adds a time delay. The delay unit 512-0 stores the V polarization processing target signal, which is a demodulation decoding target signal, and adds a time delay. The transmission path estimator 514-0 estimates transmission path characteristics from a pilot signal or the like included in the V polarization processing target signal. Demodulator 515-0 using the transmission path characteristic estimated by the transmission path estimator 514-0, calculates the likelihood information sequence of the V polarization signal V ₀ demodulates the V polarization signal being processed . Decoder 516-0 performs error correction processing and decoding processing based on the likelihood calculated by the demodulator 515-0, obtain information sequence of the V polarization signal V _0.

The re-encoder 517-0 performs the same coding on the information sequence decoded by the decoder 516-0 as the coding used in the transmission apparatus that has transmitted the information sequence. The re-modulator 518-0 modulates the information sequence encoded by the re-encoder 517-0 with the same modulation method as that used in the transmission apparatus that transmitted the information sequence. The amplitude / phase adjuster 519-0 multiplies the estimated value of the transmission path characteristic estimated by the transmission path estimator 514-0 by the signal modulated by the remodulator 518-0, and transmits the V transmitted by the transmission apparatus as the transmission source. A replica V polarization signal V ₀ ′, which is an estimation signal when the polarization signal V ₀ is received by the receiving device, is generated.

The subtractor 521-0 removes the replica V polarization signal V ₀ ′ generated by the amplitude phase adjuster 519-0 from the V polarization processing target signal output from the delay unit 512-0, and creates a new V polarization. A wave processing target signal is generated. The power measuring device 524-0 measures the signal power of the V polarization processing target signal output from the subtractor 521-0, and the power measuring device 525-0 outputs the H polarized wave output from the delay device 511-0. Measure the signal power of the signal to be processed. The comparator 526-0 compares the signal power of the V polarization processing target signal and the H polarization processing target signal measured by the power measuring devices 524-0 and 526-0, and the higher power level is demodulated and decoded. The selector 527-0 is instructed by the control signal to select as a signal. Further, when the comparator 526-0 obtains any one of the information sequences P_θ _{1 to} P_θ _n by the next demodulation and decoding process, the comparator 526-0 proceeds to the demodulation and decoding processing units 510-1 to 510-n that perform the demodulation and decoding operation next. The control signal notifies that the demodulation and decoding target signal is the V polarization processing target signal or the H polarization processing target signal. In accordance with an instruction from the comparator 526-0, the selector 527-0 sends the demodulated decoding target signal and the demodulating / decoding signal to the demodulating / decoding unit that performs the next demodulating / decoding operation among the demodulating / decoding processing units 510-1 to 510-1 A V polarization processing target signal and an H polarization processing target signal are output as target signals.

In the case of the demodulation / decoding processing unit 510- (n + 1), “−0” of the code of each unit is set to “− (n + 1)”, and “V polarization processing target signal” is set to “H polarization processing target signal”. In addition, “H polarization processing target signal” is “V polarization processing target signal”, “V polarization signal V ₀ ” is “H polarization signal H ₀ ”, and “replica V polarization signal V ₀ ′”. Is read as “replica H polarization signal H ₀ ′”.

  FIG. 14 is a block diagram illustrating a configuration of the demodulation / decoding processing unit 510-i (i = 1 to n) illustrated in FIG. The demodulation decoding processing unit 510-i (i = 1 to n) includes a delay unit 511-i, a delay unit 512-i, a projector 513-i, a transmission path estimator 514-i, a demodulator 515-i, and a decoder. 516-i, re-encoder 517-i, re-modulator 518-i, amplitude phase adjuster 519-i, projector 520-i, subtractor 521-i, projector 522-i, subtractor 523-i , Power meter 524-i, power meter 525-i, comparator 526-i, and selector 527-i.

The delay unit 511-i stores the demodulation / decoding non-target signal and adds a time delay. The delay unit 512-i stores the demodulation decoding target signal and adds a time delay. When the received control signal notifies that the demodulation target signal is a V polarization processing target signal, the projector 513-i projects the demodulation decoding target signal from the V polarization axis to the P_θ _i polarization axis. When a mapping component is generated and it is notified that the signal to be demodulated and decoded is an H polarization processing target signal, a mapping component obtained by projecting the signal to be demodulated and decoded from the H polarization axis to the P_θ _i polarization axis is obtained. The transmission path estimator 514-i estimates transmission path characteristics from a pilot signal or the like included in the component mapped to the P_θ _i polarization axis output from the projector 513-i. Demodulator 515-i, using the transmission path characteristic estimated by the transmission path estimator 514-i, the mapping component to P_shita _i polarization axis output from the projector 513-i of P_shita _i polarized signal The likelihood of the information series is calculated. The decoder 516-i performs error correction processing and decoding processing based on the likelihood calculated by the demodulator 515-i, and obtains an information sequence of the P_θ _i polarization signal.

The re-encoder 517-i performs the same coding on the information sequence decoded by the decoder 516-i as the coding used in the transmission apparatus that has transmitted the information sequence. The remodulator 518-i modulates the information sequence encoded by the reencoder 517-i using the same modulation method as that used in the transmission apparatus that transmitted the information sequence. The amplitude / phase adjuster 519-i multiplies the signal modulated by the remodulator 518-i by the estimated value of the transmission channel characteristic estimated by the transmission channel estimator 514-i, and transmits P_θ transmitted by the transmission device of the transmission source _A replica P_θ _i- polarization signal, which is an estimation signal when the _i- polarization signal is received by the receiving device, is generated.

When the received control signal notifies that the demodulation and decoding target signal is the V polarization processing target signal, the projector 520-i receives the replica P_θ _i polarization signal generated by the amplitude and phase adjuster 519-i. When the replica mapping component V _i ′ projected from the P_θ _i polarization axis to the V polarization axis is generated and it is notified that the demodulation decoding target signal is the H polarization processing target signal, the amplitude phase adjuster 519-i A replica mapping component H _i ′ is generated by projecting the replica P_θ _i polarization signal generated by the above process from the P_θ _i polarization axis to the H polarization axis. The subtractor 521-i subtracts the mapping component V _i ′ or H _i ′ of the replica P_θ _i polarization signal generated by the projector 520-i from the demodulation decoding target signal output from the delay unit 512-i. The processing target signal is output.

When the received control signal notifies that the demodulation and decoding target signal is the V polarization processing target signal, the projector 522-i receives the replica P_θ _i polarization signal generated by the amplitude and phase adjuster 519-i. When the replica mapping component H _i ′ projected from the P_θ _i polarization axis to the H polarization axis is generated and it is notified that the demodulation decoding target signal is the H polarization processing target signal, the amplitude phase adjuster 519-i A replica mapping component V _i ′ is generated by projecting the replica P_θ _i polarization signal generated by the above process from the P_θ _i polarization axis to the V polarization axis. The subtractor 523-i subtracts the mapping component H _i ′ or V _i ′ of the replica P_θ _i polarization signal generated by the projector 522-i from the demodulation / decoding non-target signal output from the delay unit 511-i. The processing target signal that is the result is output.

The power measuring device 524-i measures the signal power of the processing target signal output from the subtractor 521-i, and the power measuring device 525-i outputs the signal power of the processing target signal output from the subtractor 523-i. Measure. The comparator 526-i compares the signal powers of the processing target signals measured by the power measuring devices 524-i and 526-i, and selects the selector 527 based on the control signal so as to output the processing target signal having the higher power level. Instruct -i. When an information sequence of P_θ _{(i + 1)} is obtained by the next demodulation / decoding process, the demodulation / decoding target signal is a V-polarization processing target signal or an H-polarization signal to the demodulation / decoding processing unit 510- (i + 1) that performs the demodulation / decoding process The control signal notifies that it is a signal to be processed. In accordance with an instruction from the comparator 526-i, the selector 527-i performs demodulation decoding in any of the demodulation decoding processing units 510-0, 510-(i + 1), and 510-(n + 1) that perform demodulation decoding processing next. A target signal and a target signal to be processed as a demodulation / decoding non-target signal are output.

Subsequently, a signal reception process of the reception device 500 will be described.
FIG. 15 is a flowchart showing the flow of signal reception processing of the reception device 500, and FIGS. 16 to 19 are diagrams for explaining signal reception processing of the reception device 500.
Hereinafter, the receiving apparatus 500, V polarization signal _V 0, P_θ ₁ mapping component _{V 1} of the the V axis of polarization of polarized signals, and the mapping component _{V 2} to V polarization axis of P_shita ₂ polarized signal Is a mapping of the V polarization multiplexed signal, the H polarization signal H ₀ , the mapping component H _{1 of} the P_θ ₁ polarization signal to the H polarization axis, and the mapping of the P_θ ₂ polarization signal to the H polarization axis A case where an H polarization multiplexed signal in which the component H ₂ is multiplexed will be described.

  (Process 1): In FIG. 16, the V polarization antenna 501 of the receiving apparatus 500 outputs the received V polarization multiplexed signal to the power measuring device 503 and the selector 506, and the H polarization antenna 502 receives the received H polarization. The polarization multiplexed signal is output to the power measuring device 504 and the selector 506 (step S501 in FIG. 15).

  (Process 2): The power measuring device 503 measures the signal power of the V polarization multiplexed signal input from the V polarization antenna 501, and the power measuring device 504 receives the H power input from the H polarization antenna 502. The signal power of the polarization multiplexed signal is measured (step S502 in FIG. 15).

  (Process 3): Comparator 505 compares the received signal power of the V polarization multiplexed signal measured by power meter 503 with the received signal power of the H polarization multiplexed signal measured by power meter 504. . Here, it is assumed that the received signal power of the V polarization multiplexed signal is high. The comparator 505 instructs the selector 506 by a control signal so that the V polarization multiplexed signal is to be demodulated and decoded (step S503 in FIG. 15).

(Process 4) The selector 506 selects a V polarization multiplexed signal as a signal to be demodulated and decoded according to the control signal received from the comparator 505. Since the first of the demodulation and decoding order of the V polarization multiplexed signal is the V polarization signal V ₀ (step S504 in FIG. 15: YES), the demodulation decoding processing unit 510-0 that demodulates the V polarization signal V ₀ A V-polarization processing target signal RV ₀ that is a V-polarized multiplexed signal output from the V-polarization antenna 501 is output as a demodulation / decoding target signal, and an H-polarization antenna 502 is used as a demodulation / decoding non-target signal. An H polarization processing target signal RH ₀ that is the output H polarization multiplexed signal is output.

(Process 5): The H polarization processing target signal RH ₀ is input to the delay unit 511-0 of the demodulation / decoding processing unit 510-0, and the delay unit 512-0, the transmission path estimator 514-0, and the demodulator 515 The V polarization processing target signal RV ₀ is input to −0. The transmission path estimator 514-0 estimates the transmission path characteristics from the V polarization processing target signal RV ₀ (step S505 in FIG. 15), and the demodulator 515-0 is estimated by the transmission path estimator 514-0. Using the transmission path characteristic, the V polarization processing target signal RV ₀ is demodulated to calculate the likelihood of the information sequence (step S506 in FIG. 15). Decoder 516-0 performs error correction processing and decoding processing based on the likelihood calculated by the demodulator 515-0, with the information sequence of the V polarization signal V _0, and outputs to the upper layer or the like, The data is output to the re-encoder 517-0 (step S507 in FIG. 15).

(Process 6): Since there is a polarization signal for which an information sequence is not obtained (step S508 in FIG. 15: NO), the re-encoder 517-0 adds the information sequence decoded by the decoder 516-0 to the information sequence. The same encoding as that of the transmission device of the transmission source of the V polarization signal V ₀ is performed (step S509 in FIG. 15), and the remodulator 518-0 applies the V encoded signal to the signal encoded by the reencoder 517-0. The same modulation as that of the transmission source device of the polarization signal V ₀ is performed (step S510 in FIG. 15).

(Processing 7): The amplitude phase adjuster 519-0 multiplies the signal modulated by the remodulator 518-0 by the estimated value of the transmission path characteristic estimated by the transmission path estimator 514-0, thereby replica V polarization. A signal V ₀ ′ is generated (step S511 in FIG. 15). The subtractor 521-0 removes the replica V-polarization signal V ₀ ′ from the V-polarization processing target signal RV ₀ output from the delay unit 512-0 and generates the V-polarization processing target signal RV ₁ (FIG. 15). Step S512). The V polarization processing target signal RV ₀ includes a V polarization signal V ₀ , a mapping component V ₁ to the V polarization axis to the P_θ ₁ polarization signal, and a P_θ ₂ polarization signal to the V polarization axis. Since the mapping component V ₂ is multiplexed, the V polarization processing target signal RV ₁ in which the mapping components V ₁ and V ₂ are multiplexed is generated by removing the replica V polarization signal V ₀ ′.

(Process 8): Power meter 524-0 measures the signal power of the V polarization processing signal RV ₁ output from the subtracter 521-0. The delay unit 511-0 outputs the H polarization processing target signal RH ₀ to which the time delay is added as the H polarization processing target signal RH ₁ . The H-polarization processing target signal RH ₁ includes an H-polarization signal H ₀ , a mapping component H _{1 of} the P_θ ₁ polarization signal to the H-polarization axis, and a mapping component of the P_θ ₂ polarization signal to the H-polarization axis. H ₂ is a multiplexed signal. Power meter 525-0 measures the signal power of the H polarization processing signal RH ₁ output from the delay unit 511-0 (step S502 in FIG. 15).

(Processing 9): Comparator 526-0 receives a signal power of the V polarization processing signal RV _1, which is measured by the power measuring device 524-0, H polarization processing target measured by the power meter 525-0 The signal power of the signal RH ₁ is compared. Here, it is assumed that the signal power of the V polarization processing target signal RV ₁ is determined to be high. Comparator 526-0 instructs the control signal to the selector 527-0 to the V-polarization processing signal RV ₁ and demodulating decoded (step S503 in FIG. 15). In multiplexed in the V polarization processing signal RV _1, since the earliest order of demodulation and decoding of P_shita ₁ polarized signal (step of FIG. 15 S504: NO), performs demodulation and decoding of P_shita ₁ polarized signal The demodulation / decoding processing unit 510-1 is notified by the control signal that the demodulation / decoding target signal is the V polarization processing target signal.

(Process 10) selector 527-0 in accordance with the control signal received from the comparator 526-0 selects the V-polarized signal being processed RV ₁ as demodulated decoded signal. The selector 527-0 outputs the V polarization processing target signal RV ₁ as a demodulation decoding target signal to the demodulation decoding processing unit 510-1 that performs demodulation decoding processing next, and also H polarization as a demodulation decoding non-target signal The processing target signal RH ₁ is output.

(Processing 11): In FIG. 17, H polarized wave processed signal RH ₁ is inputted to the delay unit 511-1 of the demodulation decoding section 510-1, V polarized wave to the delay unit 512-1 and projectors 513-1 A processing target signal RV ₁ is input. Projector 513-1, since demodulation decoding target signal by a control signal received from the comparator 526-0 is notified that a V polarization processing signal, a V-polarized signal being processed RV ₁ V Henhajiku from generating a mapping component projected to P_shita ₁ polarization axes, and outputs to the transmission path estimator 514-1 and the demodulator 515-1 (step S513 in FIG. 15).

(Processing 12): The transmission path estimator 514-1 estimates a channel characteristic from the mapping component to P_shita ₁ polarization axis (step S514 in FIG. 15), the demodulator 515-1, the transmission path estimator 514 -1 using the transmission path characteristic estimated by, it calculates the likelihood information sequence mapping components to P_shita ₁ polarization axis (step S515 in FIG. 15). Decoder 516-1 performs error correction processing and decoding processing based on the likelihood calculated by the demodulator 515-1, to obtain information sequence P_shita ₁ polarized signal, and outputs to the upper layer or the like, re The data is output to the encoder 517-1 (step S516 in FIG. 15).

(Process 13): Since there is a polarization signal for which an information sequence is not obtained (step S517 of FIG. 15: NO), the re-encoder 517-1 includes the information sequence decoded by the decoder 516-1. P_shita ₁ polarized signal transmission source performs the same encoding and transmitting device (step S518 in FIG. 15), re-modulator 518-1 is the signal re-encoder 517-1 is encoded, P_shita ₁ The same modulation as that of the transmission device of the polarization signal is performed (step S519 in FIG. 15).

(Processing 14): the amplitude and phase adjuster 519-1, the transmission path estimator 514-1 is remodulator 518-1 of the estimated values of the transmission path characteristic estimated by multiplying the modulated signal by a replica P_shita ₁ with polarized A wave signal is generated and output to the projectors 520-1 and 522-1 (step S520 in FIG. 15).

(Processing 15): Since the projector 520-1 is notified by the control signal received from the comparator 526-0 that the demodulation decoding target signal is a V polarization processing target signal, the amplitude phase adjuster 519-1 A replica mapping component V ₁ ′ is generated by projecting the generated replica P_θ ₁ polarization signal from the P_θ ₁ polarization axis to the V polarization axis (step S521 in FIG. 15). The subtractor 521-1 subtracts the replica mapping component V ₁ ′ generated by the projector 520-1 from the V polarization processing target signal RV ₁ output from the delay unit 512-1, and performs V polarization processing. The target signal RV ₂ is output. The V polarization processing signal RV _1, mapping component _{V 1} of the the V axis of polarization of P_shita ₁ polarization signal, and the mapping component _{V 2} to V polarization axis of P_shita ₂ polarization signal are multiplexed because you are, by removing the replica mapping component _{V 1} ', V polarization processing signal RV ₂ contains only mapping component _{V 2} is generated (step S522 of FIG. 15).

(Processing 16): Since the projector 522-1 is notified by the control signal received from the comparator 526-0 that the demodulation decoding target signal is the V polarization processing target signal, the amplitude phase adjuster 519-1 A replica mapping component H ₁ ′ is generated by projecting the generated replica P_θ ₁ polarization signal from the P_θ ₁ polarization axis to the H polarization axis (step S521 in FIG. 15). The subtractor 523-1 is a result of subtracting the replica mapping component H ₁ ′ generated by the projector 522-1 from the H polarization processing target signal RH ₁ output from the delay unit 511-1. and it outputs a target signal RH _2. The H polarization processing target signal RH ₁ includes an H polarization signal H ₀ , a mapping component H _{1 of} the P_θ ₁ polarization signal to the H polarization axis, and a mapping of the P_θ ₂ polarization signal to the H polarization axis. Since the component H ₂ is multiplexed, the H polarization processing target signal RH ₂ in which the H polarization signal H ₀ and the mapping component H ₂ are multiplexed is generated by removing the replica mapping component H ₁ ′ ( Step S522 in FIG. 15).

(Processing 17): Power meter 524-1 is the signal power of the V polarization processing signal RV ₂ output from the subtracter 521-1 is measured, the power meter 525-1 includes a subtractor 523-1 The signal power of the H-polarization processing target signal RH ₂ output from is measured (step S502 in FIG. 15).

(Processing 18): comparator 526-1 is the signal power of the V polarization processing signal RV _2, which is measured by the power measuring device 524-1, H polarization processing target measured by the power meter 525-1 The signal power of the signal RH ₂ is compared. Here, it is determines that the signal power of the H polarization processing signal RH ₂ is high (step S503 in FIG. 15). Further, the comparator 526-1, among which are multiplexed on the H polarization processing signal RH _2, since the earlier order of the most demodulation decoding the H polarization signal _{H 0} (step of FIG. 15 S504: YES), Next, it is determined that the demodulation / decoding processing unit 510- (n + 1) that demodulates the H polarization signal operates. Comparator 526-1 instructs the control signal to the selector 527-1 to the H polarization processing signal RH ₂ demodulation decoding target.

(Process 19) selector 527-1 in accordance with the control signal received from the comparator 526-1 selects the H-polarized wave processed signal RH ₂ as a demodulated decoded signal. Selector 527-1 is the demodulation decoding unit then performs demodulation and decoding processing 510- (n + 1), and outputs the H-polarized wave processed signal RH ₂ as a demodulated decoded signal, V as a demodulated decoded non target signal The polarization processing target signal RV ₂ is output.

(Processing 20): 18, the V-polarized signal being processed RV ₂ are input to the delay unit 511- (n + 1) of the demodulation decoding section 510-(n + 1), delayer 512- (n + 1), channel estimation instrument 514- (n + 1), and, H polarization processing signal RH ₂ is input to a demodulator 515- (n + 1). The transmission path estimator 514- (n + 1) estimates the channel characteristics from the H polarization processing signal RH ₂ (step S505 in FIG. 15), a demodulator 515- (n + 1), the transmission path estimator 514- ( n + 1) using the transmission path characteristic estimated by demodulates the H polarization processing signal RH ₂ calculates the likelihood information sequence (step S506 of FIG. 15). Decoder 516- (n + 1) performs error correction and decoding based on the likelihood calculated by the demodulator 515- (n + 1), to obtain information sequence H polarization signal H _0, the upper layer or the like At the same time, it is output to the re-encoder 517- (n + 1) (step S507 in FIG. 15).

(Process 21): Since there is a polarization signal for which no information series is obtained (step S508 in FIG. 15: NO), the re-encoder 517- (n + 1) is decoded by the decoder 516- (n + 1). The information sequence is encoded in the same manner as the transmission apparatus that is the transmission source of the H polarization signal H ₀ (step S509 in FIG. 15), and the remodulator 518- (n + 1) is the reencoder 517- (n + 1). Is subjected to the same modulation as that of the transmission device of the H polarization signal H ₀ (step S510 in FIG. 15).

(Process 22): The amplitude / phase adjuster 519- (n + 1) multiplies the signal modulated by the remodulator 518- (n + 1) by the estimated value of the transmission path characteristic estimated by the transmission path estimator 514- (n + 1). Then, the replica H polarization signal H ₀ ′ is generated (step S511 in FIG. 15). The subtractor 521- (n + 1) removes the replica H-polarization signal H ₀ ′ from the H-polarization processing target signal RH ₂ output from the delay unit 512- (n + 1) to generate the H-polarization processing target signal RH ₃ . (Step S512 in FIG. 15). Since the H polarization signal H ₀ and the mapping component H _{2 of} the P_θ ₂ polarization signal to the H polarization axis are multiplexed in the H polarization processing target signal RH ₂ , the replica H polarization signal H ₀ By removing ', the H-polarization processing target signal RH ₃ consisting only of the mapping component H ₂ is generated.

(Processing 23): Power meter 524- (n + 1) measures the signal power of the subtracter 521- (n + 1) V polarization processing signal RV ₃ output from. Delayer 511- (n + 1) outputs the V-polarized processing signal RV ₂ obtained by adding a time delay as a V polarization processing signal RV _3. Power meter 525 - (n + 1) measures the signal power of the delayer 511- (n + 1) V polarization processing signal RV ₃ output from the (step S502 in FIG. 15).

(Processing 24): comparator 526- (n + 1) includes a signal power of the H polarization processing signal RH ₃ measured by the power measuring instrument 524- (n + 1), is measured by the power meter 525 - (n + 1) The signal power of the V polarization processing target signal RV ₃ is compared. Here, it is determined that there is a high V polarization processing signal RV _3. Comparator 526- (n + 1) is indicated by the control signal to the selector 527- (n + 1) to the V-polarization processing signal RV ₃ and the demodulation decoding target (step S503 in FIG. 15). The V polarization processing signal RV _3, because it only includes mapping component _{V 2} to V polarization axis of P_shita ₂ polarized signal (step of FIG. 15 S504: NO), the comparator 526- (n + 1) is Then, the control signal notifies the demodulation / decoding processing unit 510-2 that performs the demodulation / decoding process that the demodulation / decoding target signal is the V polarization processing target signal.

(Process 25) selector 527- (n + 1) in accordance with a control signal received from the comparator 526- (n + 1), selects the V-polarized signal being processed RV ₃ as a demodulated decoded signal. Selector 527- (n + 1) is next demodulation decoding section 510-2 which performs demodulation and decoding processing, and outputs the V-polarized signal being processed RV ₃ as a demodulated decoded signal. Note that neither the V-polarization processing target signal RV ₃ that is a demodulation decoding target signal nor the H-polarization processing target signal RH ₃ that is a demodulation decoding non-target signal is multiplexed, and is demodulated in the next demodulation decoding processing unit 510-2. Since all the polarization signals are obtained by decoding, it is not necessary to output the demodulation / decoding non-target signal.

(Processing 26): 19, the V-polarized signal being processed RV ₃ is input to the projector 513-2 of the demodulation decoding section 510-2. Projector 513-2, the comparator 526- (n + 1) for demodulating decoded signal by a control signal received is notified that a V polarization processing signal from the V polarization processing signal RV ₃ V polarization generating a mapping component projected from the wave axis to P_shita ₂ polarization axes, and outputs to the transmission path estimator 514-2 and the demodulator 515-2 (step S513 in FIG. 15).

(Processing 27): The transmission path estimator 514-2 estimates a channel characteristic from the mapping component to P_shita ₂ polarization axes (step S514 in FIG. 15), the demodulator 515-2, the transmission path estimator 514 -2 with a transmission path characteristic estimated by, calculates the likelihood information sequence mapping components to P_shita ₂ polarization axes (step S515 in FIG. 15). Decoder 516-2 performs error correction processing and decoding processing based on the likelihood calculated by the demodulator 515-2, to obtain information sequence P_shita ₂ polarized signal, and outputs to the upper layer or the like (FIG. 15 Step S516). The receiving apparatus 500 ends the process because all the polarization signal information sequences have been obtained (step S517: YES).

Note that in (process 18), if it is determined that the signal power of the V polarization processing signal RV ₂ is high, operates as the following (process 18 ') later.

(Process 18 '): the comparator 526-1 is the signal power of the V polarization processing signal RV ₂ is determined to be higher than the signal power of the H polarization processing signal RH _2. The comparator 526-1 is the V polarization processing signal RV ₂ instructs the control signal to the selector 527-1 to a demodulation decoding target, the demodulation decoding unit 510-2, the demodulation decoding target signal V polarized It is notified by a control signal that it is a wave processing target signal (step S503 in FIG. 15). Selector 527-1 is the demodulation and decoding unit 510-2, an output outputs the V-polarized signal being processed RV ₂ as a demodulated decoded signal, the H polarization processing signal RH ₂ as demodulation and decoding non-target signal (Step S504 in FIG. 15: NO).

(Processing 19 ′): The H polarization processing target signal RH ₂ is input to the delay unit 511-1 of the demodulation / decoding processing unit 510-2, and the V polarization processing target signal is input to the delay unit 512-2 and the projector 513-2. RV ₂ is input. Projector 513-1 generates a mapping component obtained by projecting the V polarization processing signal RV ₂ from the V polarization axes P_shita ₂ to polarization axes (step S513 in FIG. 15). Transmission path estimator 514-2 estimates a channel characteristic from the mapping component to P_shita ₂ polarization axes (step S514 in FIG. 15), the demodulator 515-2, using the estimated channel characteristics , and calculates the likelihood information sequence mapping components to P_shita ₂ polarization axes (step S515 in FIG. 15). Decoder 516-2 performs error correction processing and decoding processing based on the calculated likelihood, obtain information sequence P_shita ₂ polarized signal (step S516 in FIG. 15).

(Process 20 ′): Since there is a polarization signal for which an information sequence is not obtained (step S517 of FIG. 15: NO), the re-encoder 517-2 applies the information sequence decoded by the decoder 516-2. , P_θ is encoded in the same manner as the transmission device that is the transmission source of the _two polarization signals (step S518 in FIG. 15), and the remodulator 518-2 converts the signal encoded by the reencoder 517-2 into P_θ. Modulation similar to that performed by the transmission source transmission device for the _two polarized signals is performed (step S519 in FIG. 15). Amplitude and phase adjuster 519-2 multiplies the signal remodulator 518-2 is obtained by modulating the estimation values of the transmission path characteristic estimated by the transmission path estimator 514-2 generates a replica P_shita ₂ polarization signal (Step S520 in FIG. 15).

(Processing 21 ′): The projector 520-2 generates a replica mapping component V ₂ ′ obtained by projecting the replica P_θ ₂ polarization signal from the P_θ ₂ polarization axis to the V polarization axis (step S521 in FIG. 15). The subtractor 521-2 outputs a V polarization processing target signal RV ₃ which is a result of subtracting the replica mapping component V ₂ ′ from the V polarization processing target signal RV ₂ output from the delay unit 512-2 (FIG. 15 step S522).

(Process 22 ′): The projector 522-2 generates a replica mapping component H ₂ ′ obtained by projecting the replica P_θ ₂ polarization signal from the P_θ ₂ polarization axis to the H polarization axis (step S521 in FIG. 15). Subtractor 523-2 outputs the H-polarized wave processing signal RH ₂ to the delay unit 511-2 has output, the H polarization processing signal RH ₃ is a result of subtracting the replica mapping component _{H 2} '(FIG. 15 step S522).

(Processing 23 ′): The comparator 526-2 uses the signal power of the V-polarization processing target signal RV ₃ measured by the power measuring device 524-2 to measure the H-polarization processing measured by the power measuring device 525-2. It is determined that the signal power of the target signal RH ₃ is high (step S502 in FIG. 15). Comparator 526-2 instructs the control signal to the selector 527-2 to the H polarization processing signal RH ₃ and demodulation decoding target (step S503 in FIG. 15). Selector 527-2 is the demodulation decoding unit 510- (n + 1), and outputs the H-polarized wave processed signal RH ₃ as a demodulated decoded signal (step of FIG. 15 S504: YES).

(Process 24 ′): The transmission path estimator 514- (n + 1) of the demodulation / decoding processing unit 510- (n + 1) estimates the transmission path characteristics from the H polarization processing target signal RH ₃ (step S505 in FIG. 15). demodulator 515- (n + 1), using the estimated channel characteristics, and demodulates the H polarization processing signal RH ₃ calculates the likelihood information sequence (step S506 of FIG. 15). Decoder 516- (n + 1) performs error correction processing and decoding processing based on the calculated likelihood, step of obtaining the information sequence H polarization signal H _0, and outputs to the upper layer or the like (FIG. 15 S507). The receiving apparatus 500 ends the process because all the polarization signal information sequences have been obtained (step S508: YES).

As described above, all information sequences of the V polarization signal V ₀ , the H polarization signal H ₀ , the P_θ ₁ polarization signal, and the P_θ ₂ polarization signal can be obtained.

  The receiving apparatus 500 performs demodulation decoding on the V polarization multiplexed signal and the H polarization multiplexed signal received at the next timing while performing demodulation decoding on the V polarization multiplexed signal and the H polarization multiplexed signal received at a certain timing. It is also possible to do.

In the above embodiment, the demodulation / decoding processing unit 510-i (i = 1 to n) is a mapping component obtained by projecting either the V polarization processing target signal or the H polarization processing target signal onto the P_θ _i polarization axis. P_θ _i- polarization signal is demodulated and decoded from the V-polarization processing target signal, but the V-polarization signal V ₀ is removed from the V-polarization processing target signal, and the H-polarization signal H ₀ is removed from the H-polarization processing target signal. Now if you are in, P_shita the V polarization processing signal and mapping component obtained by projecting the P_shita _i polarization axes, and a mapping component from synthesized mapping component obtained by projecting the H polarization processing signal to P_shita _i polarization axes _i Demodulation and decoding of the polarization signal may be performed.

For example, in the (process 25) above, selectors 527- (n + 1) outputs the V-polarized signal being processed RV ₃ and the H polarization processing signal RH ₃ to the demodulation decoding section 510-2. Then, in the (process 26), a demodulation decoding unit 510-2, a mapping component obtained by projecting the V polarization processing signal RV ₃ from V polarization axes P_shita ₂ to polarization axis, H polarized wave processed signal RH ₃ was generated and projected mapping component from H polarization axes P_shita ₂ to polarization axis, by combining these mapping components and outputs the transmission path estimator 514-2 and the demodulator 515-2.
Various combining means such as maximum ratio combining, in-phase combining, and selective combining can be used as combining means, and thereby a diversity combining gain can be obtained.

  In the above embodiment, signal power is used for comparison of signal quality, but SINR may be used. In this case, an SINR measuring device is provided instead of the power measuring device of receiving apparatus 500, and the comparator instructs to select the better SINR.

Note that a right-handed circularly polarized wave antenna and a left-handed circularly polarized wave antenna are used in place of the V-polarized antenna and the H-polarized antenna, and third through third right-handed circularly polarized signals and left-handed circularly polarized signals are used. N polarization signals may be multiplexed.
Further, the third to Nth polarization signals do not need to be linearly polarized waves, and generally elliptically polarized waves can be used. The elliptically polarized wave includes a linearly polarized wave and a circularly polarized wave.

  According to the embodiment described above, it is possible to realize polarization multiplexing of three or more polarizations using a dual polarization multiplexing antenna that transmits and receives orthogonal V-polarized waves and H-polarized waves, thereby improving frequency utilization efficiency. Even when there is a difference in the reception level between these antenna elements, it is possible to avoid demodulation errors and restore a normal information sequence.

100, 200, 300 ... Transmitters 110-0 to 110- (n + 1), 210-0 to 210- (n + 1), 310-1 to 310-n ... Encoders 120-0 to 120- (n + 1), 220 -0 to 220- (n + 1), 320-1 to 320-n ... modulators 130a-1 to 130a-n, 130b-1 to 130b-n, 330a-1 to 330a-n, 330b-1 to 330b-n ... Projector (projector)
140a, 140b ... adders 150a, 250-0, 350a-1 to 350a-n ... V-polarized antenna (first polarized wave transmitter)
150b, 250- (n + 1), 350b-1 to 350b-n... H polarization antenna (second polarization transmission unit)
201-0 to 201- (n + 1), 301-1 to 301-n ... transmitting units 250-1 to 250-n ... P_θ1 polarization antenna to P_θn polarization antenna 500 ... reception device 501 ... V polarization antenna (First polarization receiver)
502 ... H polarization antenna (second polarization receiving section)
503, 504, 524-0 to 524- (n + 1), 525-0 to 525- (n + 1) ... power measuring devices 513-1 to 513-n, 520-1 to 520-n, 522-1 to 522-n ... Projector (projector)
505, 526-0 to 526- (n + 1)... Comparator (comparator)
506, 527-0 to 527- (n + 1)... Selectors 510-0 to 510- (n + 1)... Demodulation decoding processing units 511-0 to 511- (n + 1), 512-0 to 512- (n + 1). 514-0 to 514- (n + 1) ... transmission path estimators 515-0 to 515- (n + 1) ... demodulator (demodulation decoding unit)
516-0 to 516- (n + 1)... Decoder (demodulation decoding unit)
517-0 to 517- (n + 1) ... re-encoder (replica signal generator)
518-0 to 518- (n + 1) ... remodulator (replica signal generator)
519-0 to 519- (n + 1)... Amplitude phase adjuster (amplitude phase adjuster)
521-0 to 521- (n + 1), 522-1 to 521-n, 5233-1 to 523-n... Subtracter (subtraction unit)

Claims (7)

The first polarization signal and the second polarization signal using the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization. A polarization multiplexing transmission system comprising a transmitter and a receiver for multiplexing and transmitting non-orthogonal polarization signals using non-orthogonal polarization,
The transmitter is
Projecting the non-orthogonal polarization signal onto the first polarization to generate a first mapping component, and projecting the non-orthogonal polarization signal onto the second polarization to generate a second mapping component And
A first polarization transmission unit that transmits the first polarization signal and the first mapping component generated by the projection unit at the same frequency;
A second polarization transmission unit that transmits the second polarization signal and the second mapping component generated by the projection unit at the same frequency;
The receiving device is:
A first polarization receiver for receiving a first multiplexed signal in which the first polarization signal and the first mapping component are multiplexed;
A second polarization receiver for receiving a second multiplexed signal in which the second polarization signal and the second mapping component are multiplexed;
The first multiplexed signal received by the first polarization receiver, or a first processing target signal that is a signal obtained by removing a replica signal from the first multiplexed signal; and the second polarization receiver A comparison unit that compares the quality of the received second multiplexed signal or a second processing target signal that is a signal obtained by removing a replica signal from the second multiplexed signal;
When the comparison unit determines that the quality of the first processing target signal is high, the first polarization signal or the non-orthogonal polarization signal is demodulated and decoded from the first processing target signal, and the comparison unit A demodulation decoding unit that demodulates and decodes the second polarization signal or the non-orthogonal polarization signal from the second processing target signal when it is determined that the quality of the second processing target signal is high;
A replica signal generation unit that generates a replica signal of the first polarization signal, the second polarization signal, or the non-orthogonal polarization signal demodulated and decoded by the demodulation decoding unit;
When the replica signal generation unit generates a replica signal of the non-orthogonal polarization signal, it generates a first replica mapping component that is a projection conversion of the replica signal of the non-orthogonal polarization signal to the first polarization. And a replica signal projection unit that generates a second replica mapping component that is a projection conversion of the replica signal of the non-orthogonal polarization signal to the second polarization;
When the first polarization signal is demodulated and decoded by the demodulation decoding unit, a new signal generated by removing the replica signal of the first polarization signal generated by the replica signal generation unit from the first processing target signal The first signal to be processed is output to the comparison unit, and when the second polarization signal is demodulated and decoded by the demodulation and decoding unit, the replica signal generation unit generates from the second signal to be processed The new second processing target signal generated by removing the replica signal of the second polarization signal is output to the comparison unit, and when the non-orthogonal polarization signal is demodulated and decoded by the demodulation and decoding unit, The first processing target signal generated by removing the first replica mapping component generated by the replica signal projection unit from the first processing target signal is output to the comparison unit, and the second processing is performed. Subject And a subtraction unit which outputs the replica signal new second processing signal generated by removing the second replica image component projection unit has generated to the comparison unit from,
A polarization multiplexing transmission system characterized by that.   The demodulating and decoding unit demodulates and decodes the non-orthogonal polarization signal from a signal obtained by projecting the first processing target signal or the second processing target signal onto the non-orthogonal polarization. 1. A polarization multiplexing transmission system according to 1. The first processing target signal, the second processing target signal, or the first processing target signal or the second processing target signal that has been determined to have high quality by the comparison unit is converted to the non-orthogonal bias. A transmission path estimator that performs transmission path estimation from the signal projected on the wave;
The transmission path estimation unit operates the transmission path estimation value estimated from the first processing target signal on the replica signal of the first polarization signal generated by the replica signal generation section, and outputs it to the subtraction section. The replica estimation signal generated by the replica signal generator is applied to the replica signal of the second polarization signal, and the transmission path estimation value estimated from the second processing target signal by the transmission path estimation unit is output to the subtractor. The transmission path estimation value estimated from the signal projected by the transmission path estimation unit to the non-orthogonal polarization is applied to the replica signal of the non-orthogonal polarization signal generated by the signal generation unit to the replica signal projection unit. An output amplitude phase adjustment unit,
The polarization multiplexing transmission system according to claim 1 or 2, wherein the system is a polarization multiplexing transmission system.   4. The polarization multiplexing transmission system according to claim 1, wherein the comparison unit determines a signal quality based on a signal power or a signal-to-interference / noise ratio. 5. The first polarization signal and the second polarization signal using the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization. A receiving device in a polarization multiplexing transmission system for multiplexing and transmitting non-orthogonal polarization signals using non-orthogonal polarization,
A first polarization receiving unit that receives a first multiplexed signal in which the first polarization signal and a first mapping component obtained by projecting the non-orthogonal polarization signal onto the first polarization are multiplexed;
A second polarization receiving unit that receives a second multiplexed signal in which the second polarization signal and a second mapping component obtained by projecting the non-orthogonal polarization signal onto the second polarization are multiplexed;
The first multiplexed signal received by the first polarization receiver, or a first processing target signal that is a signal obtained by removing a replica signal from the first multiplexed signal; and the second polarization receiver A comparison unit that compares the quality of the received second multiplexed signal or a second processing target signal that is a signal obtained by removing a replica signal from the second multiplexed signal;
When the comparison unit determines that the quality of the first processing target signal is high, the first polarization signal or the non-orthogonal polarization signal is demodulated and decoded from the first processing target signal, and the comparison unit A demodulation decoding unit that demodulates and decodes the second polarization signal or the non-orthogonal polarization signal from the second processing target signal when it is determined that the quality of the second processing target signal is high;
A replica signal generation unit that generates a replica signal of the first polarization signal, the second polarization signal, or the non-orthogonal polarization signal demodulated and decoded by the demodulation decoding unit;
When the replica signal generation unit generates a replica signal of the non-orthogonal polarization signal, it generates a first replica mapping component that is a projection conversion of the replica signal of the non-orthogonal polarization signal to the first polarization. And a replica signal projection unit that generates a second replica mapping component that is a projection conversion of the replica signal of the non-orthogonal polarization signal to the second polarization;
When the first polarization signal is demodulated and decoded by the demodulation decoding unit, a new signal generated by removing the replica signal of the first polarization signal generated by the replica signal generation unit from the first processing target signal The first signal to be processed is output to the comparison unit, and when the second polarization signal is demodulated and decoded by the demodulation and decoding unit, the replica signal generation unit generates from the second signal to be processed The new second processing target signal generated by removing the replica signal of the second polarization signal is output to the comparison unit, and when the non-orthogonal polarization signal is demodulated and decoded by the demodulation and decoding unit, The first processing target signal generated by removing the first replica mapping component generated by the replica signal projection unit from the first processing target signal is output to the comparison unit, and the second processing is performed. Subject A subtraction unit for outputting a new second processing signal generated by removing the replica said second replica mapping component signal projection unit has generated to the comparison unit from,
A receiving apparatus comprising: The first polarization signal and the second polarization signal using the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization. A polarization multiplexing transmission method for a polarization multiplexing transmission system comprising a transmitter and a receiver for multiplexing and transmitting non-orthogonal polarization signals using non-orthogonal polarization,
The transmitting device is
Projecting the non-orthogonal polarization signal onto the first polarization to generate a first mapping component, and projecting the non-orthogonal polarization signal onto the second polarization to generate a second mapping component Process,
A first polarization transmission process for transmitting the first polarization signal and the first mapping component generated in the projection process at the same frequency;
A second polarization transmission process for transmitting the second polarization signal and the second mapping component generated in the projection process at the same frequency;
The receiving device is
A first polarization reception process for receiving a first multiplexed signal in which the first polarization signal and the first mapping component are multiplexed;
A second polarization receiving process for receiving a second multiplexed signal in which the second polarization signal and the second mapping component are multiplexed;
The first multiplexed signal received in the first polarization reception process, or a first processing target signal that is a signal obtained by removing a replica signal from the first multiplexed signal, and the second polarization reception A comparison process for comparing the quality of the second multiplexed signal received in the process or a second processing target signal that is a signal obtained by removing a replica signal from the second multiplexed signal;
When it is determined that the quality of the first processing target signal is high in the comparison process, the first polarization signal or the non-orthogonal polarization signal is demodulated and decoded from the first processing target signal, and the comparison process A demodulation and decoding process for demodulating and decoding the second polarization signal or the non-orthogonal polarization signal from the second processing target signal,
A replica signal generation process for generating a replica signal of the first polarization signal, the second polarization signal, or the non-orthogonal polarization signal demodulated and decoded in the demodulation and decoding process;
When a replica signal of the non-orthogonal polarization signal is generated in the replica signal generation process, a first replica mapping component that is a projection conversion of the replica signal of the non-orthogonal polarization signal to the first polarization is generated. And a replica signal projection process for generating a second replica mapping component that is a projection conversion of the replica signal of the non-orthogonal polarization signal to the second polarization,
When the first polarization signal is demodulated and decoded in the demodulation and decoding process, a replica signal of the first polarization signal generated in the replica signal generation process is removed from the first processing target signal and a new signal is generated. When the first processing target signal is generated and the second polarization signal is demodulated and decoded in the demodulation and decoding process, the second bias generated in the replica signal generating process from the second processing target signal is generated. When the non-orthogonal polarization signal is demodulated and decoded in the demodulation and decoding process, the replica signal is removed from the first signal to be processed. The first replica mapping component generated in the projection process is removed to generate a new first processing target signal, and the replica is generated from the second processing target signal. And a subtraction process of generating a No. new second processed signal by removing the second replica mapping components produced in the projection process,
After the subtraction process, the process from the comparison process is repeated.
A polarization multiplexing transmission method. The first polarization signal and the second polarization signal using the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization. A receiving method of a receiving device in a polarization multiplexing transmission system that multiplexes and transmits non-orthogonal polarization signals using non-orthogonal polarization,
Receiving a first multiplexed signal obtained by multiplexing the first polarization signal and a first mapping component obtained by projecting the non-orthogonal polarization signal onto the first polarization;
A second polarization receiving process for receiving a second multiplexed signal obtained by multiplexing the second polarization signal and a second mapping component obtained by projecting the non-orthogonal polarization signal onto the second polarization;
The first multiplexed signal received in the first polarization reception process, or a first processing target signal that is a signal obtained by removing a replica signal from the first multiplexed signal, and the second polarization reception A comparison process for comparing the quality of the second multiplexed signal received in the process or a second processing target signal that is a signal obtained by removing a replica signal from the second multiplexed signal;
When it is determined that the quality of the first processing target signal is high in the comparison process, the first polarization signal or the non-orthogonal polarization signal is demodulated and decoded from the first processing target signal, and the comparison process A demodulation and decoding process for demodulating and decoding the second polarization signal or the non-orthogonal polarization signal from the second processing target signal,
A replica signal generation process for generating a replica signal of the first polarization signal, the second polarization signal, or the non-orthogonal polarization signal demodulated and decoded in the demodulation and decoding process;
When a replica signal of the non-orthogonal polarization signal is generated in the replica signal generation process, a first replica mapping component that is a projection conversion of the replica signal of the non-orthogonal polarization signal to the first polarization is generated. And a replica signal projection process for generating a second replica mapping component that is a projection conversion of the replica signal of the non-orthogonal polarization signal to the second polarization,
When the first polarization signal is demodulated and decoded in the demodulation and decoding process, a replica signal of the first polarization signal generated in the replica signal generation process is removed from the first processing target signal and a new signal is generated. When the first processing target signal is generated and the second polarization signal is demodulated and decoded in the demodulation and decoding process, the second bias generated in the replica signal generating process from the second processing target signal is generated. When the non-orthogonal polarization signal is demodulated and decoded in the demodulation and decoding process, the replica signal is removed from the first signal to be processed. The first replica mapping component generated in the projection process is removed to generate a new first processing target signal, and the replica is generated from the second processing target signal. And a subtraction process of generating a No. new second processed signal by removing the second replica mapping components produced in the projection process,
After the subtraction process, the process from the comparison process is repeated.
And a receiving method.

Images