Low-Bit Rate Feedback Strategies for Iterative IA-Precoded MIMO-OFDM-Based Systems

Table 1

Number of quantization bits required for the discussed quantization strategies for one OFDM block and for one frame (set of 𝐼 blocks and a training sequence).

Quantization strategy	Number of quantization bits per block	Number of quantization bits per frame
RVQ	𝑁𝑏1=𝐵𝑀𝐾^2𝑁	𝑁𝑓1=𝐵𝑀𝐾^2𝑁𝐼
CFR	𝑁𝑏2=2𝑚𝑁CP𝑀^2𝐾^2	𝑁𝑓2=2𝑚𝑁CP𝑀^2𝐾^2𝐼
CIR-QI	𝑁𝑏3=2𝑚𝐿𝑀^2𝐾^2	𝑁𝑓3=𝑚𝐿𝑀^2𝐾^2(2𝐼+1)
CIR-AP	𝑁𝑏4=2𝑚𝐿𝑀^2𝐾^2	𝑁𝑓4=𝑚𝐿𝑀^2𝐾^2(2𝐼+1)
CIR-P	𝑁𝑏5=𝑚𝐿𝑀^2𝐾^2	𝑁𝑓5=𝑚𝐿𝑀^2𝐾^2(𝐼+2)
CIR-D	—	𝑁𝑓6=4𝑚𝐿𝑀^2𝐾^2