[Discuss-gnuradio] Constallation receiver block in gnuradio companion

[Nazmul Islam]

Hello,

I want to transmit a continuous stream of data and obtain its synchronized version (before decoding) at the receiver using gnuradio companion. Following the generic_mod_demod.py, I have designed the transmit and receive path in the following way

Tx:    GLFSR source (producing +1 & -1) --> RRC filter --> USRP Sink

Rx: USRP Source --> AGC2 --> FLL Band Edge --> Polyphase Clock Sync.

I want to insert the Constellation Receiver block at the end of the Polyphase Clock Sync. I have two questions on this:

1. The Constellation Receiver block asks for "constellation object" and it accepts raw data type. What should I put here? I tried using the options 2 and bpsk but they did not work.

2. The Constellation_Receiver_cb accepts baseband complex streams and returns byte level data. Will it output the decoded data? I want the complex data, that has gone through the costas and M&M recovery block, but has not been decoded yet. How can I obtain that?

Any suggestion will be appreciated.

Thanks,

Nazmul

-- 
Muhammad Nazmul Islam

Graduate Student
Electrical & Computer Engineering
Wireless Information & Networking Laboratory
Rutgers, USA.