test_query.py

import arxiv

client = arxiv.Client()

QUERY = """
(
    "tutorial" OR "survey" OR "introduction to" OR 
    "fundamentals of" OR "primer on" OR "overview of" OR
    "lecture notes" OR "from first principles"
) AND (
    "signal processing" OR "wireless" OR "OFDM" OR "MIMO" OR
    "channel" OR "modulation" OR "electromagnetic" OR
    "information theory" OR "spectrum" OR "antenna" OR
    "5G" OR "6G" OR "communication systems" OR
    "Fourier" OR "sampling" OR "stochastic process"
)
"""

search = arxiv.Search(
    query=QUERY,
    max_results=2000,
)

results = list(client.results(search))
print(f"Total papers found: {len(results)}")

from collections import Counter
cats = Counter()
for p in results:
    for c in p.categories:
        cats[c] += 1

for cat, count in cats.most_common(10):
    print(f"  {cat}: {count}")