Radio communication apparatus
A technology of receivers and encoders, applied in communication between multiple stations, electrical components, shaping networks in transmitters/receivers, etc., can solve problems such as reducing error rates and improving
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no. 1 example
[0043] Fig. 5 is a diagrammatic view of a data transmitter of a first embodiment of the present invention.
[0044] Convolutional encoder 501 according to this embodiment encodes transmission data 500 , modulates it with modulator 502 , and transmits it with transmission antenna 503 . In the receiving system, the received signal received by the receiving antenna 504 is input to a UDMV (combined decoder with MLSE and Viterbi decoder) 505 through a detector. Then, distortion due to multipath fading is compensated simultaneously with error correction by Viterbi encoding, thereby obtaining demodulated data 506 . UDMV505 combines the demodulator of MLSE and Viterbi decoder.
[0045] Figure 6 shows a functional block diagram of UDMV505. The virtual convolutional encoder 511 is a digital filter constructed to have a state in which the convolutional encoder 501 of the transmission system and the line distortion are combined. The convolutional encoder 511 will be described in detail...
no. 2 example
[0066] FIG. 8 shows the structure of functional blocks of a transmission system according to a second embodiment of the present invention. The functional blocks of the receiving system are constituted by UDMVs similar to those of the first embodiment.
[0067] The frame forming section 611 forms user data into a frame. The convolutional encoder 601 performs error correction encoding on frame data, and generates transmission sequences whose number corresponds to the encoding rate. Interleaver 612 performs interleaving to reorder the coded sequences and controls to allocate data to the time slots of each transmitted sequence. The slot forming section 613 assigns slots to the interleaved transmission sequence, and sets pilot symbols and transmission power control bits (TPC). The transmit sequence is inserted into the time slot, modulated by modulator 614, and transmitted by the antenna through transmit amplifier 615.
[0068] FIG. 9 shows the setup of the convolutional encoder...
no. 3 example
[0078] This embodiment shows a case where time slots interleaved in a random form are performed by an interleaver similar to the case of the second embodiment to transmit data among a plurality of frequencies.
[0079] Fig. 11 shows an example of frequency hopping according to this embodiment. This figure shows the situation that four users transmit data using four frequencies. Reference numeral 700 is a signal of frequency f1, 701 is a signal of frequency f2, 702 is a signal of frequency f3, and 703 is a signal of frequency f4. In this case, f1 to f4 are frequencies different from each other. Each block represents a time slot.
[0080] Assume that a certain user 1 is noticed. Frequency hopping is performed as shown in the network cable part in the figure. User 1 uses frequencies f1, f2, f4, f3, f1, f3, f4, f3, f2 to transmit data for each time slot.
[0081] According to the above-described embodiments, the correlation between fading becomes smaller when the frequencies ...
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