Base station device, mobile station device, distributed antenna wireless communication system, pilot channel generation method, synchronization channel generation method, and antenna selection method
A technology of wireless communication system and synchronization channel, applied in wireless communication, radio transmission system, pilot signal distribution, etc., can solve problems such as the influence of system characteristics
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no. 1 approach
[0066] The basic concept of the first embodiment of the present invention is to assign different Pilot1 to each RAU belonging to the BS, and assign the same Pilot2 to each RAU belonging to the BS, and to form a unique PiCH for each RAU by combining Pilot1 and Pilot2.
[0067] First, define the following tags.
[0068] Antenna number ANT_g (g=1, 2, 3, ..., G),
[0069] RAU number RAU_i (i=1, 2, 3, ..., I),
[0070] BS number BS_j (j=1, 2, 3, ..., J),
[0071] Code number Pilot1_m (m=1, 2, 3, . . . , M) of Pilot1,
[0072] The code number of Pilot2 is Pilot2_n (n=1, 2, 3, . . . , N).
[0073] Next, the total number G of antennas, the total number I of RAUs, and the total number J of BSs of the system are defined. That is, G=IxJ. For example, in the case of G=512, I=8, J=64 or I=4, J=128 can be selected. Furthermore, M (M>=I) Pilot1 codes and N (N>=J) Pilot2 codes are designed (see below). One Pilot1 code is selected from M Pilot1 codes, and distributed to one RAU (i is as...
no. 2 approach
[0102] The basic concept of the second embodiment of the present invention is to construct the SCH by associating the BS number with the code number of SCH2. In the above-mentioned first embodiment, the Pilot1_m code is assigned to the RAU number RAU_i (i=1, 2, 3, ..., I), and the BS number BS_j (j = 1, 2, 3, .. ..., J) Assign Pilot2_n codes, and use G=IxJ to represent the antenna number ANT_g (g=1, 2, 3, . . . , G).
[0103] Next, the structure of the SCH according to this embodiment will be described. The SCH inserted into the downlink radio frame is used for initial synchronization of OFDM received signals, antenna selection, and the like. SCH consists of SCH1 and SCH2. The SCH1 includes information such as carrier frequency offset (offset) synchronization, OFDM symbol timing (symbol timing) synchronization, and the like. SCH2 includes information related to ANT_g, the frequency bandwidth of the broadcast channel BCH depending on the system bandwidth (System Bandwidth) s...
no. 3 approach
[0117] The basic concept of the third embodiment of the present invention is to associate the RAU number with the code number of SCH1 to form the SCH. In the above-mentioned first and second embodiments, the Pilot1_m code is assigned to the RAU number RAU_i (i=1, 2, 3, ..., I), and the BS number BS_j (j=1, 2 , 3,..., J) assign Pilot2_n codes, and use G=IxJ to represent the antenna number ANT_g (g=1, 2, 3,..., G). In addition, the BS number BS_j is associated with the SCH2 number SCH2_y to constitute the SCH.
[0118] The structure of SCH1 related to this embodiment is as follows. Such as Figure 11 As shown, the carrier frequency offset and OFDM symbol timing are detected through the autocorrelation of the repeated waveform in the time domain of the SCH1 signal, and the SCH1 code number SCH1_x (x=1, 2, 3, . . . . , X) Establish an associated RAU_i (i=1, 2, 3, . . . , I).
[0119] SCH1 can use various codes (for example, random codes, orthogonal codes, phase rotation codes,...
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